Relevant bibliographies by topics / Teleseism

Academic literature on the topic 'Teleseism'

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Published: 10 March 2023

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Journal articles on the topic "Teleseism"

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van Ginkel, Janneke, Elmer Ruigrok, and Rien Herber. "Using horizontal-to-vertical spectral ratios to construct shear-wave velocity profiles." Solid Earth 11, no. 6 (November 9, 2020): 2015–30. http://dx.doi.org/10.5194/se-11-2015-2020.

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Abstract. For seismic hazard assessment and earthquake hypocentre localization, detailed shear-wave velocity profiles are an important input parameter. Here, we present a method to construct a shear-wave velocity profiles for a deep unconsolidated sedimentary layer by using strong teleseismic phases and the ambient noise field. Gas extraction in the Groningen field, in the northern part of the Netherlands, is causing low-magnitude, induced seismic events. This region forms an excellent case study due to the presence of a permanent borehole network and detailed subsurface knowledge. Instead of conventional horizontal-to-vertical spectral ratios (H∕V ratios) from amplitude spectra, we calculate power spectral densities and use those as input for H∕V calculations. The strong teleseisms provide resonance recordings at low frequencies, where the seismic noise field is too weak to be recorded well with the employed geophones and accelerometers. The H∕V ratios of the ambient noise field are compared with several forward modelling approaches to quality check the teleseism-based shear-wave velocity profiles. Using the well-constrained depth of the sedimentary basin, we invert the H∕V ratios for velocity profiles. A close relationship is observed between the H∕V spectral ratios from the ambient noise field, shear-wave resonance frequencies and Rayleigh-wave ellipticity. By processing only five teleseismic events, we are able to derive shear-wave velocities for the deeper sedimentary sequence with a 7 % bias in comparison with the existing detailed velocity model for the Cenozoic sediments overlying the Groningen gas field. Furthermore, a relation between resonance frequency and unconsolidated sediment thickness is derived, to be used in other areas in the Netherlands, where detailed depth maps are not available.
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Evans, John R., and Andrew M. Pitt. "Reliable automatic detection of long-period volcanic earthquakes at Long Valley caldera, California." Bulletin of the Seismological Society of America 85, no. 5 (October 1, 1995): 1518–22. http://dx.doi.org/10.1785/bssa0850051518.

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Abstract Capturing the rare long-period (LP) volcanic earthquakes occurring in and near Long Valley caldera, California, is important to ongoing volcanic-hazards monitoring. It is difficult, however, because LP events are weak, emergent, and almost devoid of energy above a few hertz. Automatic systems designed for tectonic earthquakes routinely fail to capture LP events. We applied a PC-based teleseism-specific event-detection computer program to capturing these events. Retuning the software for LP events involved only changing parameters originally designed for change in this algorithm. Our retuned algorithm has captured every known LP event at Long Valley from October 1992 through the end of 1994. We monitored up to 16 stations known to produce good records of LP events, saving those events that triggered enough of these stations (typically 10 of 16) within a specified time window. The principal difficulty has been the algorithm's sensitivity to regional earthquakes, which have waveforms similar to LP events. During our test, the 1992 Landers, 1994 Northridge, and 1994 Double Springs Flat (Nevada) earthquakes each have swamped the detector, requiring careful, active management of PC disk resources. The efficacy of this retuned algorithm and the poor performance of tectonic-earthquake detectors during some volcanic emergencies make this algorithm an attractive candidate for volcano monitoring.
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Olsen, Kim B., James C. Pechmann, and Gerard T. Schuster. "Simulation of 3D elastic wave propagation in the Salt Lake Basin." Bulletin of the Seismological Society of America 85, no. 6 (December 1, 1995): 1688–710. http://dx.doi.org/10.1785/bssa0850061688.

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Abstract We have used a 3D finite-difference method to model 0.2 to 1.2 Hz elastodynamic site amplification in the Salt Lake Valley, Utah. The valley is underlain by a sedimentary basin, which in our model has dimensions of 48 by 25 by 1.3 km. Simulations are carried out for a P wave propagating vertically from below and for P waves propagating horizontally to the north, south, east, and west in a two-layer model consisting of semi-consolidated sediments surrounded by bedrock. Results show that in general, sites with the largest particle velocities, cumulative kinetic energies, duration times of motion, and spectral magnitudes overlie the deepest parts of the basin. The maximum values of these parameters are generally found above steeply dipping parts of the basin walls. The largest vector particle velocities are associated with P or SV waves that come from within 10° of the source azimuth. Low-energy S and surface waves follow the strongest arrivals. The largest peak particle velocities, cumulative kinetic energies, signal durations, and spectral magnitudes in the simulations are, respectively, 2.9, 15.9, 40.0, and 3.5 times greater than the values at a rock site measured on the component parallel to the propagation direction of the incident P wave. Scattering and/or mode conversions at the basin boundaries contribute significantly to the signal duration times. As a check on the validity of our simulations, we compared our 3D synthetic seismograms for the vertically incident plane P wave to seismograms of nearly vertically incident teleseismic P waves recorded at an alluvium site in the valley and at a nearby rock site. The 3D synthetics for the alluvium site overestimate the relatively small amplification of the initial P wave and underestimate the large amplification of the coda. Using 2D simulations, we find that most of the discrepancies between the 3D synthetic and observed records can be explained by an apparently incorrect total sediment thickness, omission from the model of the near-surface low-velocity unconsolidated sediments and of attenuation, and the inexact modeling of the incidence angle of the teleseism. The records from a 2D simulation in which these deficiencies are remedied (with Q = 65), and which also includes topography and a near-surface velocity gradient in the bedrock, provide a better match to the teleseismic data than the records from the simple two-layer 3D simulation. Our results suggest that for steeply incident P waves, the impedance decrease and resonance effects associated with the deeper basin structure control the amplification of the initial P-wave arrival, whereas reverberations in the near-surface unconsolidated sediments generate the large-amplitude coda. These reverberations are caused mainly by P-to-S converted waves, and their strength is therefore highly sensitive to the incidence angle of the source.
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Vasco, D. W. "Deriving source-time functions using principal component analysis." Bulletin of the Seismological Society of America 79, no. 3 (June 1, 1989): 711–30. http://dx.doi.org/10.1785/bssa0790030711.

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Abstract Factors such as source complexity, microseismic noise, and lateral heterogeneity all introduce nonuniqueness into the source-time function. The technique of principal component analysis is used to factor the moment tensor into a set of orthogonal source-time functions. This is accomplished through the singular value decomposition of the time-varying moment tensor. The adequacy of assuming a single source-time function may then be examined through the singular values of the decomposition. The F test can also be used to assess the significance of the various principal component basis functions. The set of significant basis functions can be used to test models of the source-time functions, including multiple sources. Application of this technique to the Harzer nuclear explosion indicated that a single source-time function was found to adequately explain the moment tensor. It consists of a single pulse appearing on the diagonal elements of the moment-rate tensor. The decomposition of the moment tensor for a deep teleseism in the Bonin Islands revealed three basis functions associated with relatively large singular values. The F test indicated that only two of the principal components were significant. The principal component associated with the largest singular value consists of a large pulse followed 16-sec later by a diminished pulse. The second principal component, a long-period oscillation, appears to be a manifestation of the poor resolution of the moment-rate tensor at low frequencies.
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Lewis, Brian T. R., and LeRoy M. Dorman. "Recording teleseisms on the seafloor; an example from the Juan de Fuca plate." Bulletin of the Seismological Society of America 88, no. 1 (February 1, 1998): 107–16. http://dx.doi.org/10.1785/bssa0880010107.

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Abstract In 1991, during an experiment to compare low-frequency seismic noise on a basaltic and a sediment covered seafloor (NOBS), we recorded teleseisms on the Juan de Fuca ridge, the Gorda ridge, and the adjacent Cascadia Basin with the SNAG ocean-bottom seismometers (OBS). These data provide an indication of the type of data that may be obtained from future experiments to record teleseisms and may be helpful in designing these experiments and analyzing the results. We found that although seafloor noise is dominated by microseisms in the band 0.1 to 0.3 Hz, there is a well-developed minimum in noise from about 0.03 to 0.1 Hz (the noise notch). In this noise notch, teleseisms can be most easily detected. In the Cascadia area, the overall noise levels are such that only teleseismic events with magnitude greater than 6.5 were usefully recorded. A magnitude 6.6 event in the New Britain area (Δ = 89°) produced usable P- and surface-wave data only in this noise notch. In the band 0.03 to 0.1 Hz, the character of compressional waves is very sensitive to water depth and the type of sensor. We show that pressure sensors are especially sensitive to reverberation in the ocean and that motion sensors (seismometers) are less sensitive to ocean reverberations and will record teleseismic phases with less distortion than pressure sensors. The Cascadia data indicate enhanced P amplitudes at sites on the ridge axes that could be due to focusing caused by a low-velocity lens. These data suggest that amplitude information may be as, or even more, useful than P delay times for determining upper mantle structure.
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Li, Yingping, William Prothero, Clifford Thurber, and Rhett Butler. "Observations of ambient noise and signal coherency on the Island of Hawaii for teleseismic studies." Bulletin of the Seismological Society of America 84, no. 4 (August 1, 1994): 1229–42. http://dx.doi.org/10.1785/bssa0840041229.

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Abstract Ambient seismic noise conditions at several sites on the Island of Hawaii have been studied by analyzing noise power spectral density (PSD) and signal-to-noise ratio (SNR) of teleseisms. Broadband digital waveform data used in this study were collected during Project ALOHA. Direct comparison of noise PSD and SNR of teleseisms simultaneously recorded at stations on Hawaii and at station KIP on Oahu indicates that the stations on Hawaii are quieter than station KIP on Oahu in the frequency band of 0.1 to 1 Hz, suggesting that the Island of Hawaii can provide better noise conditions than station KIP. Our interpretation of this observation is that the area and volume of Hawaii are much larger than those of Oahu and distances to the coast for the stations on Hawaii are larger than that for station KIP on Oahu. Stronger attenuation and relatively low coherency for teleseismic signals on Hawaii in frequencies of 0.4 to 1.2 Hz are attributed to the presence of partial melt in the upper mantle. Teleseismic signal coherency is very low at frequencies above 2 Hz for a small array with a radius about 2 km. The relatively high coherency of the tangential component is strongly indicative of severe scattering effects caused by the heterogeneity in structure of the active volcanic area.
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Short, Kevin M. "Detection of Teleseismic Events in Seismic Sensor Data Using Nonlinear Dynamic Forecasting." International Journal of Bifurcation and Chaos 07, no. 08 (August 1997): 1833–45. http://dx.doi.org/10.1142/s0218127497001400.

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In this paper we consider the use of nonlinear dynamic (NLD) forecasting as a signal processing tool for seismic applications. The specific problem considered here arises in monitoring nuclear tests and nuclear treaty compliance, where the presence of ubiquitous background noise obscures the seismic signals associated with the tests. The problem is that the signal from a distant teleseismic event can be attenuated so that it is lost in the background noise, and since the noise overlaps the frequency band occupied by the teleseisms, frequency-based techniques provide only marginal improvements in detection capabilities. For the work in this paper, we studied a test set of actual seismic sensor data prepared by the Air Force Technical Applications Center (AFTAC). The data set was composed of background seismic noise which contained or had added to it a number of hidden teleseismic signals. This data was analyzed to determine if techniques of NLD forecasting could be used to detect the hidden signals. For this test case, it was possible to predict the behavior of the seismic background sufficiently well that when the predicted background behavior was removed, the hidden signals became evident. However, some of the weaker signals were very close to the residual noise level, so the ability to detect these events is compromised.
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Ambarsari, Riana, Madlazim ., and Utama Alan Deta. "PENCITRAAN RUPTURE GEMPABUMI DI LOMBOK TIMUR MW 6,9 PADA 19 AGUSTUS 2018 DENGAN METODE BACK PROJECTION." Inovasi Fisika Indonesia 10, no. 3 (December 10, 2021): 24–32. http://dx.doi.org/10.26740/ifi.v10n3.p24-32.

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Abstrak Gempabumi yang terjadi di Lombok pada 19 Agustus 2018 berkekuatan Mw 6,9 merupakan gempa mainshock kedua sebagai akibat dari rangkaian gempabumi Lombok pada Juli – Agustus 2018. Penelitian ini bertujuan untuk meneliti karakteristik rupture gempabumi di Lombok Timur Mw 6,9 yang terjadi pada tanggal 19 Agustus 2018 dari hasil pencitraan arah, kecepatan, durasi, dan panjang rupture gempabumi. Metode yang digunakan dalam penelitian ini dengan teknik pemrosesan array teleseismik menggunakan metode Multiple Signal Back-Projection (MUSICBP) dalam software MATLAB. Data yang digunakan adalah data sekunder dari data seismogram teleseismik dengan 54 stasiun-stasiun seismik array AU (Australia) berformat .SAC dari repositori IRIS Wilber 3. Data tersebut diolah dengan menggunakan program MUSICBP serta dilakukan filter bandpass dengan rentang frekuensi 0,05 – 0,25 Hz melalui proses cross correlation. Hasil keluaran yang diperoleh berupa plot durasi, arah, dan panjang rupture gempa dari MUSICBP serta nilai kemiringan grafik untuk menentukan kecepatan dari rupture gempa dari hasil regresi linear. Hasil dari penelitian ini menunjukkan bahwa pencitraan rupture menggunakan metode MUSICBP adalah sesuai yang divalidasi dengan lokasi gempa susulan-gempa susulan (aftershock) yang terjadi di zona segmentasi rupture tersebut. Berdasarkan hasil dan pembahasan, pada penelitian ini dapat disimpulkan bahwa karakteristik rupture yang terjadi pada gempabumi di Lombok Timur Mw 6,9 tanggal 19 Agustus 2018 adalah arah rupture merambat ke arah Timur secara unilateral sepanjang ~25 km berdurasi 25 s dengan kecepatan rupture 1,74 km/s yang termasuk dalam rentang kecepatan rendah. Hasil dari pencitraan rupture menunjukkan gempabumi yang terjadi di Lombok Timur pada 19 Agustus 2018 tersebut disebabkan oleh aktivitas Flores back arc thrust di wilayah Pulau Lombok bagian Utara dengan arah rupture merambat menuju ke arah Timur (eastward) dengan mekanisme tipe sesar naik (thrust fault). Kata Kunci: Rupture Gempa, Back Projection, Gempa Teleseismik, Sesar Flores Back-Arc. Abstract The earthquake that occurred in Lombok on August 19, 2018, with a magnitude of Mw 6.9 was the second mainshock earthquake as a result of the Lombok earthquake series in July – August 2018. This study aims to examine the characteristics of the earthquake rupture in East Lombok Mw 6.9 which occurred on 19 August 2018 from the results of imaging the direction, speed, duration, and length of earthquake rupture. The method used in this research is a teleseismic array processing technique using the Multiple Signal Back-Projection (MUSICBP) method in MATLAB software. The data used is secondary data from teleseismic seismogram data with 54 AU (Australia) seismic array stations in .SAC format from the IRIS Wilber 3 repository. The data was processed using the MUSICBP program and a bandpass filter was performed with a frequency range of 0.05 – 0.25 Hz through the cross-correlation process. The outputs obtained are plots of duration, direction, and length of earthquake rupture from MUSICBP and the slope value of the graph to determine the velocity of earthquake rupture from linear regression results. This study indicates that the rupture imaging using the MUSICBP method is appropriate which is validated by the location of the aftershocks that occur in the rupture segmentation zone. Based on the results and discussion, in this study, it can be concluded that the characteristics of the rupture that occurred in the earthquake in East Lombok Mw 6.9 on 19 August 2018 were the direction of the rupture spreading towards the East unilaterally along ~25 km with a duration of 25 s with a rupture speed of 1.74 km/s which is included in the low-speed range. The results of the rupture imaging show that the earthquake that occurred in East Lombok on August 19, 2018, was caused by the activity of Flores back arc thrust in the northern part of Lombok Island with the direction of the rupture spreading towards the East (eastward) with a thrust fault type mechanism. Keywords: Earthquake Rupture, Back Projection, Teleseismic Earthquake, Flores Back-Arc Thrust.
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Sari, Sendy Oktaviana, and Madlazim . "ANALISIS DINAMIKA RUPTURE GEMPABUMI PADA 5 AGUSTUS 2018 DI LOMBOK UTARA Mw 6,9 MENGGUNAKAN METODE MUSICBP." Inovasi Fisika Indonesia 10, no. 3 (December 10, 2021): 33–38. http://dx.doi.org/10.26740/ifi.v10n3.p33-38.

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Abstrak Gempa bumi Mw = 6,9 yang terjadi di Lombok Utara pada 5 Agustus 2018 disebabkan karena adanya aktivitas seismik dari sesar Flores. Penelitian ini bertujuan untuk mengestimasi rupture gempabumi yang terjadi di daerah Lombok Utara, Nusa Tenggara Barat. Parameter rupture yang diestimasi berupa nilai durasi, panjang, kecepatan, dan arah rupture. Metode yang digunakan ialah Multiple Signal Back-Projection (MUSICBP) dengan menggunakan filter band pass pada rentang 0,25 Hz – 1 Hz. Data yang digunakan didapatkan dari website IRIS Wilber 3 berupa format SAC dengan jarak epicentral berupa teleseismik menggunakan stasiun Array Australia sebanyak 36 stasiun yang sudah diproses dengan metode cross correlation sehingga diperoleh sinyal yang koheren dan sefase. Hasil dari penelitian ini yaitu pada gempabumi Lombok Utara memiliki arah rupture unilateral menuju ke barat. Hal tersebut sesuai dengan orientasi sesar Flores, sehingga dapat disimpulkan bahwa gempabumi ini diakibatkan karena aktivitas seismik sesar Flores. Aktivitas sesar Flores mengakibatkan gempabumi ini memiliki jenis sesar naik (reverse fault) dengan durasi rupture lebih dari 50 sekon sehingga didapatkan nilai kecepatan rambat rupture yaitu 3,1 km/s sepanjang 72 km. Hasil-hasil dinamika rupture yang didapatkan dalam penelitian ini menunjukkan bahwa lokasi gempa-gempa susulan berada di jalur zona segmentasi rupture gempabumi ini sehingga diharapkan dapat mengestimasi lokasi-lokasi gempabumi susulan secara cepat dan akurat. Kata Kunci: parameter rupture, back projection, teleseismik, sesar Flores. Abstract The Mw = 6.9 earthquake that occurred in North Lombok on August 5, 2018, was caused by seismic activity from the Flores fault. This study aims to estimate the earthquake rupture that occurred in ​​North Lombok, West Nusa Tenggara. The estimated rupture parameters are the duration, length, speed, and rupture direction. The method used is Multiple Signal Back-Projection (MUSICBP) using a bandpass filter in the range of 0.25 Hz – 1 Hz. The data used is obtained from the IRIS Wilber 3 website in SAC format with an epicentral distance in the form of teleseismic using the Array Australia station as many as 36 stations that have been processed by the cross-correlation method so that a coherent and in-phase signal is obtained. The results of this study are that the North Lombok earthquake has a unilateral rupture direction towards the west. This is following the orientation of the Flores fault, so it can be concluded that this earthquake was caused by the seismic activity of the Flores fault. The Flores fault activity caused this earthquake to have a reverse fault type with a rupture duration of more than 50 seconds so that the rupture propagation velocity value was 3,1 km/s along 72 km. The result of the rupture dynamics obtained in this study indicate that the location of the aftershocks is in the segmentation zone of this earhquake rupture so that it is expected to be able to estimate the location of the aftershocks quickly and accurately. Keywords : Parameter rupture, back projection, teleseismic, Flores fault.
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Fan, Chengliang, Gary L. Pavlis, Arthur B. Weglein, and Bogdan G. Nita. "Removing free-surface multiples from teleseismic transmission and constructed reflection responses using reciprocity and the inverse scattering series." GEOPHYSICS 71, no. 4 (July 2006): SI71—SI78. http://dx.doi.org/10.1190/1.2217369.

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We develop a new way to remove free-surface multiples from teleseismic P- transmission and constructed reflection responses. We consider two types of teleseismic waves with the presence of the free surface: One is the recorded waves under the real transmission geometry; the other is the constructed waves under a virtual reflection geometry. The theory presented is limited to 1D plane wave acoustic media, but this approximation is reasonable for the teleseismic P-wave problem resulting from the steep emergence angle of the wavefield. Using one-way wavefield reciprocity, we show how the teleseismic reflection responses can be reconstructed from the teleseismic transmission responses. We use the inverse scattering series to remove free-surface multiples from the original transmission data and from the reconstructed reflection response. We derive an alternative algorithm for reconstructing the reflection response from the transmission data that is obtained by taking the difference between the teleseismic transmission waves before and after free-surface multiple removal. Numerical tests with 1D acoustic layered earth models demonstrate the validity of the theory we develop. Noise test shows that the algorithm can work with S/N ratio as low as 5 compared to actual data with S/N ratio from 30 to 50. Testing with elastic synthetic data indicates that the acoustic algorithm is still effective for small incidence angles of typical teleseismic wavefields.
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Dissertations / Theses on the topic "Teleseism"

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Pucciarelli, Giuseppe. "Seismic tomography of Italy (with special regard to Southern Tyrrhenian)." Doctoral thesis, Universita degli studi di Salerno, 2017. http://hdl.handle.net/10556/2569.

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2015 - 2016
The topic of my PhD thesis is a seismic tomography which has as object of investigation Italy, particularly Southern Italy and Southern Tyrrhenian. This tomography has been obtained by means of inversion of teleseismic data. Seismic tomography is a method of investigation which is considerably stabilized in the field of Geophysics. Its goal is the achievement of a tridimensional velocity model of a subsoil of a determined area. For reaching this aim, it is necessary to gather arrival times of seismic events registered by seismic stations that are distributed in an opportune way on the area subject to process of investigation and an one-dimensional velocity model (that is, velocity only in function of depth). Through this last one, there is the computation of theoretical travel times for each pair seismic event – seismic station. This particular phase of method is called forward problem. Then, there is the computation of the difference between observed travel times and these theoretical travel times, a difference named residual. This is the description of so-called inverse problem. The computation happens in an iterative way and it stops when the residual is minimum. Obtained tridimensional velocity model corresponds with the model where residual is minimum. The entire process of operation of a seismic tomography is completely described in first chapter of this thesis. The second chapter describes the phenomen of subduction, that is of a particular process which happens, under determined conditions, at convergent boundaries of plates. I have dedicated a chapter to this phenomen because the area subject to this research, the basin of Southern Tyrrhenian, is a result of a roll-back subducting Ionian slab. After a paragraph dedicated to a general description of tectonic plates theory, other paragraphs describe the kinematics and the dynamics of subduction processes. This seismic tomography has been obtained by inversion of teleseismic travel times. This particular kind of choice has been made because teleseismic ray travel in upper mantle at high depths, so their inversion could supply us a good resolution of an area that we want to investigate until depth of 500-600 km. The third chapter of my PhD thesis is dedicated to teleseisms. In particular, there is a description of classification of seismic events according to their epicentral distance and how we can interpretate various seismic phases on a teleseismic seismogram. A paragraph is about the nomenclature of same seismic phases deriving from the reflection and the refraction of the waves on the discontinuity surfaces present in Earth's inner. The fourth and last chapter of my PhD thesis contains the results of research and their interpretation. First paragraph is dedicated to a brief summary of geological history of Southern Tyrrhenian. Second paragraph is dedicated to a description of software used for the research, that is FMTT (Fast Marching Teleseismic Transform), created by Nick Rawlinson in 2008. Third paragraph is dedicated to description of my data. I have utilised 1929 teleseisms (only P phases) recorded in period 1990-2012 by 122 southern Italian seismic station directly connected to ISC (International Seismological Centre). I have obtained several sections at various level of depth, from 25 km to 500 km and I have obtained several profiles NS and EW at fixed values of longitude from 14° to 16° and latitude, from 37° to 40° respectively. Results, compared with previous works in that area, confirm the presence of a subducting slab in Southern Tyrrhenian. Finally, my PhD thesis is enriched by various appendixes, which describe in a particular way mathematical techniques and geophysical definitions which I have used. [edited by author]
La mia tesi di Dottorato descrive una tomografia sismica dell'Italia, e in particolare di quella meridionale e del Basso Tirreno, ottenuta mediante l'inversione di dati telesismici. La tomografia sismica è oramai un metodo di indagine notevolmente consolidato nel campo della Geofisica e consiste nel ricavare un modello di velocità tridimensionale del sottosuolo di una determinata regione. Quest'ultimo si ottiene avendo a disposizione i tempi di arrivo di eventi sismici registrati da stazioni sismiche distribuite in maniera opportuna sull'area da indagare e un modello di velocità di partenza unidimensionale. Infatti, sfruttando quest'ultimo si calcolano per gli eventi sismici considerati dei tempi di arrivo teorici (questa fase prende il nome di PROBLEMA DIRETTO). Poi si calcola la differenza tra i tempi di arrivo realmente osservati e quelli teorici, che prende il nome di residuo (questa fase prende il nome di PROBLEMA INVERSO) e si procede in maniera iterativa in maniera che il residuo sia minimo. Il modello di velocità da ottenere è quello che corrisponde al residuo minimo. Il primo capitolo della tesi descrive la trattazione matematica della tomografia sismica, dopo un paragrafo introduttivo dedicato all'uso in generale dei metodi inversi in geofisica. La tomografia sismica si dice locale se gli eventi considerati sono locali. Si dice telesismica – come quella oggetto della mia tesi – se gli eventi considerati sono, lapalissianalmente, telesismi. Il secondo capitolo parla quindi dei telesismi, della loro definizione riguardo alla classificazione degli eventi sismici in base alla distanza epicentrale e delle fasi sismiche che si possono leggere da un sismogramma di un telesisma. Questo capitolo comprende un paragrafo sulla nomenclatura delle fasi sismiche e soprattutto quelle derivanti dalla riflessione e rifrazione delle onde su tutte le superfici di discontinuità presenti all'interno della Terra. E, a tal proposito, il terzo capitolo è un'introduzione alla struttura dell'interno della Terra con attenzione particolare che viene rivolta al fenomeno della subduzione. Questo perché uno slab di subduzione è presente all'interno del Basso Tirreno, zona “protagonista” della mia indagine tomografica. Il quarto capitolo è dedicato alla storia geologica del Basso Tirreno e alle evidenze delle precedenti indagini geofisiche che hanno visto questa area sotto la lente di ingrandimento. L'ultimo capitolo riguarda i risultati della mia indagine e la loro interpretazione. Ho utilizzato i tempi di arrivo di fasi P di 1929 telesismi (selezionati in base a un intervallo di magnitudo, a un minimo di stazioni registranti e all'intervallo di residuo di stazione) registrati nel periodo 1990-2012 da 122 stazioni dell'Italia centro-meridionale collegate all'ISC (International Seismological Centre). I risultati sembrerebbero, confrontati con quelli dei lavori precedenti, confermare la presenza di uno slab di subduzione nel Basso Tirreno. [a cura dell'autore]
XV n.s. (XXIX )
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2

Burdick, Scott A. (Scott Anthony). "Teleseismic transmission and reflection tomography." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87516.

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Thesis: Ph. D. in Geophysics, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references.
The aim of seismic tomography is to determine a model of Earth properties that best explain observed seismic data. In practice, the limitations placed on our observations and computational capabilities force us to make a number of decisions about the scales and parameterizations of models, the nature of the data considered, and the approximations to wave propagation that connect the two. This thesis will consider three divergent approaches to seismic tomography spanning different representations of Earth structure at different scales, using different parts of the teleseismic wavefield, and solving the inverse problem with different approximations to the wave equation and different optimization methods. In choosing each of these approaches, we address two major decisions that influence the tomographic process: First, what relative value do we place on an less approximate treatment of wave physics versus the ability to incorporate as much information as possible in our inversion? Second, how can we use novel data to better constrain smooth seismic structure in regions that were previously unresolved? The first project presents a global ray-theoretical P-wave model that encompasses millions of traveltime picks. In this inversion, the addition of data from the dense USArray Transportable Array to global catalog data allows us to image the structure of the Eastern United States with unprecedented resolution and make a robust evaluation of the spatial scales of the heterogeneity. The second project develops a finite frequency approach to turning wave transmission tomography using a computationally efficient one-way wave propagation on curvilinear coordinates. The use of overturning coordinate systems allows for the application of wave equation tomography to phases previously unused in other oneway schemes. The final project presents a novel approach to wave-equation teleseismic reflection tomography using free surface multiples. The use of these multiply reflected phases helps to localize heterogeneity in the model to within layers of Earth structure. This project spans the final two chapters and includes the theoretical developments and an inaugural application to SsPmp data from the Hi-CLIMB array in Tibet.
by Scott A. Burdick.
Ph. D. in Geophysics
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3

Henry, Chris. "Teleseismic studies of large submarine earthquakes." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249590.

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Foley, John Edward. "Crustal structure from teleseismic bodywave data." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/52914.

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Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
Includes bibliographical references (leaves 245-255).
by John Edward Foley.
Sc.D.
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Snowden, Conor B. "The complexity of teleseismic P-waves." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/11422.

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Complex short-period teleseismic P-waveforms (consisting of the direct P wave and surface reflections pP and sP) are observed from many earthquake sources. It is often not possible to easily interpret these waveforms in terms of those three phases. This is necessary to obtain accurate earthquake depths and P and S wave radiation patterns. This thesis examines the contribution made by various factors to P-wave seismogram complexity using both synthetic and real data. First, using a number of synthetic waveforms it is confirmed that long duration sources can contribute significantly to the complexity of short-period waveforms. However, it is highlighted that by using broadband recordings much of this complexity can be accounted for, and attributed to the limited passband of the short-period recording system. In addition, S-to-P mode conversions at near-source structure can also contribute significantly to the complexity of the short-period waveform. Second, the causes of differences in the complexity of the short-period waveforms from the 1987 Whittier Narrows and the 1991 Sierra Madre earthquakes are examined. Originally these earthquakes were thought to be separated by a distance approximately the size of the first Fresnel Zone, and hence should, in theory, have indistinguishable near-source structure, when seen at teleseismic distances. Using relative amplitudes, the published CMT focal mechanism for these events is confirmed . In the case of Sierra Madre earthquake it was also possible to positively identify the one surface reflection, visible on the shortperiod seismogram, as pP. Even with complex waveforms the relative amplitude method can be used to place constraints on the focal mechanism of the Whittier Narrows earthquake. Using forward modelling, with a simple kinematic source model, synthetic seismograms are matched to the observed broadband seismograms for both earthquakes. Using this simple source model, the variation in the source duration, caused by the difference in source rupture areas between the two earthquakes, is sufficient to account for the first-order variations in complexity seen. To second order, the near-source structure is sufficiently different even at the limit of resolution of the data, to contribute to some extent to the observed complexity variation, most likely due to the large thickness of sediment west of the Sierra Madre Fault. Third, a suite of seismograms from the 29 October 1995 Caspian Sea earthquake is examined. Using relative amplitudes, the surface reflection on these seismograms is correctly identified and the actual depth estimated to be 48 km. From this it is shown that an arrival mis-identified by the Prototype International Data Center as a surface reflection is most likely to be be a mode conversion at an interface 80 km beneath the source. Forward modelling of the broadband and short-period waveforms shows that these mode-conversions are enhanced by the downward propagating line rupture, and are best seen when the position of the stations are at a node in the P-wave radiation pattern. This produces an apparently complex waveform. Visible S waves from this earthquake at European stations show the very low attenuation in the mantle path and this may contribute to the greater than usual complexity observed for this event. Finally several earthquakes that appear to show seismogram complexity that cannot be explained using a simple kinematic source model or path effects are examined. By modifying an existing finite-difference fault modelling code I present a possible dynamic source model that may provide one explanation for this additional complexity. This model includes real source physics (friction law, rupture criteria) and material heterogeneities. It produces complex farfield pulse shapes that vary with fault length, material heterogeneity, initial state of stress and attenuation.
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Sargeant, Susanne. "Modelling shallow earthquakes with teleseismic broadband data." Thesis, University of East Anglia, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251561.

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Ihmle, Pierre Frédéric. "Teleseismic study of rupture processes with long duration." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/54395.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
Includes bibliographical references (p. 229-238).
by Pierre Frédéric Ihmle.
Ph.D.
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Eken, Tuna. "Isotropic and Anisotropic P and S Velocities of the Baltic Shield Mantle : Results from Analyses of Teleseismic Body Waves." Doctoral thesis, Uppsala universitet, Geofysik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-102501.

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The upper mantle structure of Swedish part of Baltic Shield with its isotropic and anisotropic seismic velocity characteristics is investigated using telesesismic body waves (i.e. P waves and shear waves) recorded by the Swedish National Seismological Network (SNSN). Nonlinear high-resolution P and SV and SH wave isotropic tomographic inversions reveal velocity perturbations of ± 3 % down to at least 470 km below the network. Separate SV and SV models indicate several consistent major features, many of which are also consistent with P-wave results. A direct cell by cell comparison of SH and SV models reveals velocity differences of up to 4%. Numerical tests show that differences in the two S-wave models can only be partially caused by noise and limited resolution, and some features are attributed to the effect of large scale anisotropy. Shear-wave splitting and P-travel time residual analyses also detect anisotropic mantle structure. Distinct back-azimuth dependence of SKS splitting excludes single-layer anisotropy models with horizontal symmetry axes for the whole region. Joint inversion using both the P and S data reveals 3D self-consistent anisotropic models with well-defined mantle lithospheric domains. These domains of differently oriented anisotropy most probably retain fossil fabric since the domains' origin, supporting the idea of the existence of an early form of plate tectonics during formation of continental cratons already in the Archean. The possible disturbing effects of anisotropy on seismic tomography studies are investigated, and found to be potentially significant. P-wave arrival times were adjusted based on the estimates of mantle anisotropy, and re-inverted. The general pattern of the velocity-perturbation images was similar but changed significantly in some places, including the disappearance of a slab-like structure identified in the inversion with the original data. Thus the analysis demonstrates that anisotropy of quite plausible magnitude can have a significant effect on the tomographic images, and should not be ignored. If, as we believe, our estimates of anisotropy are reasonably correct, then the model based on the adjusted data should give a more robust and correct image of the mantle structure.
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Letort, Jean. "Méthodes télésismiques d'estimation de la profondeur des séismes : développements et applications." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU016/document.

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Cette thèse traite de l'étude de la profondeur des séismes modérés (4 < M < 5.5), à travers l'utilisation de données telesismiques, c'est à dire à partir d'enregistrements de sismographes situes a des distances de 3000 jusqu'à 9000 km de la source. L'estimation de la profondeur d'un séisme s'obtient en comparant les temps d'arrivée de l'onde directe (P) générée par ce séisme, avec ceux des ondes réfléchies sur la surface de la Terre, au-dessus du foyer du séisme (les phases de profondeur pP, sP). Nous utilisons le réseau du CTBTO (Comprehensive Test-Ban-Treaty-Organization, composé de mini-réseaux (10-20 sismographes), nous permettant de développer deux nouvelles méthodes d'estimation de la profondeur. La première est une inversion complète du mécanisme au foyer, simultanément a la profondeur. La seconde est une méthode d'analyse spectrale : le cepstre. A l'aide d'exemples de séismes en zone intracontinentale, nous montrons que ces deux méthodes sont complémentaires et qu'elles apportent une information nouvelle sur l'estimation de la profondeur pour les séismes de régions peu instrumentées. Dans un second temps, une optimisation de la méthode cepstrale a permis d'étendre l'estimation de la profondeur a l'utilisation de stations isolées provenant du réseau mondial IRIS. Cette nouvelle méthode, complètement automatique, a permis de localiser en profondeur les séismes de magnitude supérieure à 4.5 pour la zone de subduction de Guerrero (Mexique). Nous avons ainsi mis en évidence une répartition homogène des profondeurs des séismes dans la zone du gap de Guerrero. En combinant ces estimations de la profondeur de l'interface avec celles obtenues a l'aide d'une relocalisation de l'ensemble de la sismicité (par la méthode de l'ISC-Locator), nous proposons une imagerie de la géométrie de la subduction. Nous avons ensuite étudié l'influence de la profondeur sur les propriétés sismiques des séismes. En particulier, nous avons évalué la relation entre la profondeur et la chute de contrainte pour les séismes récents et modérés de la plaine du Pô, en Italie. Pour cela, nous nous sommes appuyés sur le réseau accéléromètrique régional de l'INGV Milan pour estimer les spectres sources de ces séismes, puis en déduire les fréquences coins et les chutes de contraintes associées. Ces spectres sources s'obtiennent à l'aide d'une méthode d'inversion qui sépare simultanément l'effet de l'atténuation, les effets de sites et l'effet de la source sur les spectres des ondes S, générées par les séismes et enregistrées en surface par les accéléromètres. Après inversion, nous trouvons une faible augmentation de la chute de contrainte avec la profondeur
This thesis deals with depth estimations of moderate earthquakes (4 < M < 5.5), observed through the use of teleseismic data. At teleseismic distances (from 3000 to 9000 km), estimations of earthquake depths come from the estimation of the delays between the arrival time of the direct P-wave and the arrival times of the waves which have been reflected on the surface above the source (known as : depth phases pP and sP). The CTBTO (Comprehensive Test-Ban- Treaty-Organization) monitoring system allows the detection of these teleseismic phases for weak events, with magnitudes below 5, since this global network is composed by arrays (10-20 close single stations, in the same location). Using this network, two methods were developed for teleseismic depth estimation. First, a depth-phase recognition method is applied, based on a new improved cepstral analysis. In addition, we have developed a focal mechanism genetic algorithm inversion. We have applied these two methods for earthquakes occurring in intracontinental areas and we have proved that these new depth determinations provide new and complementary information about the source for barely instrumented areas. We have also developed another method, completely blind and automatic, which consists in an improvement of the cepstral analysis. The reliability of this method to improve depth estimation has been proved by relocating the recent moderate seismicity of the Guerrero subduction area (Mexico). In the Guerrero area, this cepstral analysis efficiently clusters event locations. We then use teleseismic waves reflected on the subduction interface to evaluate the depth of the interface above the focal hypocenter, which allows to specify the subduction interface geometry. We have finally conducted an exhaustive analysis of the depth distributions, based on a relocalization of the ISC catalogue using the new ISC-Locator algorithm and we provide an improved image of the subduction. Finally, we have conducted a study of the relationship between earthquake depths and seismic properties. In particular, we have focused on the burning issue about the links between stress drops and focal depths. We have found an interesting case study with the Po Plain recent seismicity (Northern Italy). Brune's stress drops and magnitudes have been estimated from a generalized parametric inversion using the regional accelerometric network from INGV Milano. We have shown that there is only a slight dependency between stress drops and earthquake depths in the Po Plain
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Jiang, Wei Ping. "Determination of crustal velocity structures from teleseismic p waves." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25773.

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Books on the topic "Teleseism"

1

Eilon, Zachary Cohen. New Constraints on Extensional Environments through Analysis of Teleseisms. [New York, N.Y.?]: [publisher not identified], 2016.

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Geological Survey (U.S.), ed. Teleseismic P-wave traveltime residuals across the Cascade Range in southern Oregon. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Geological Survey (U.S.), ed. Teleseismic P-wave traveltime residuals across the Cascade Range in southern Oregon. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Geological Survey (U.S.), ed. Teleseismic P-wave traveltime residuals across the Cascade Range in southern Oregon. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Geological Survey (U.S.), ed. Teleseismic P-wave traveltime residuals across the Cascade Range in southern Oregon. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Geological Survey (U.S.), ed. Teleseismic P-wave traveltime residuals across the Cascade Range in southern Oregon. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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W, Dewey James, and Geological Survey (U.S.), eds. The Scotts Mills, Oregon, earthquake of March 25, 1993: Intensities, strong-motion data, and teleseismic data. [Reston, Va.?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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W, Dewey James, and Geological Survey (U.S.), eds. The Scotts Mills, Oregon, earthquake of March 25, 1993: Intensities, strong-motion data, and teleseismic data. [Reston, Va.?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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Lory, Robert E. Crustal structure in Maine as determined from modeling teleseismic P-waveforms. 1988.

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Teleseismic residual study of the Lassen Volcanic National Park region in California. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Book chapters on the topic "Teleseism"

1

Nolet, Guust, and Berend Scheffers. "Imaging with Teleseismic Data." In Digital Seismology and Fine Modeling of the Lithosphere, 27–47. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-6759-6_3.

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Gregersen, Soren. "Teleseismic Tomography in Sweden-Denmark-Germany, Project TOR." In Upper Mantle Heterogeneities from Active and Passive Seismology, 169–70. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-015-8979-6_16.

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Kværna, Tormod, Frode Ringdal, Johannes Schweitzer, and Lyla Taylor. "Optimized Seismic Threshold Monitoring — Part 2: Teleseismic Processing." In Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Data Processing and Infrasound, 989–1004. Basel: Birkhäuser Basel, 2002. http://dx.doi.org/10.1007/978-3-0348-8144-9_5.

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Lay, Thorne. "The teleseismic manifestation of pP: Problems and paradoxes." In Explosion Source Phenomenology, 109–25. Washington, D. C.: American Geophysical Union, 1991. http://dx.doi.org/10.1029/gm065p0109.

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Lynnes, Christopher S., and Thorne Lay. "Observations of Teleseismic P Wave Coda for Underground Explosions." In Scattering and Attenuations of Seismic Waves, Part I, 231–49. Basel: Birkhäuser Basel, 1988. http://dx.doi.org/10.1007/978-3-0348-7722-0_12.

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Pavlis, Gary L. "Direct imaging of the coda of teleseismic P waves." In Seismic Earth: Array Analysis of Broadband Seismograms, 171–85. Washington, D. C.: American Geophysical Union, 2005. http://dx.doi.org/10.1029/157gm11.

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Pearce, R. G. "Seismic Source Discrimination at Teleseismic Distances—Can We Do Better?" In Monitoring a Comprehensive Test Ban Treaty, 805–32. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-011-0419-7_43.

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Bowers, David, and William R. Walter. "Discriminating Between Large Mine Collapses and Explosions Using Teleseismic P Waves." In Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Seismic Event Discrimination and Identification, 803–30. Basel: Birkhäuser Basel, 2002. http://dx.doi.org/10.1007/978-3-0348-8169-2_11.

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Levander, Alan, Fenglin Niu, and William W. Symes. "Imaging teleseismic P to S scattered waves using the Kirchhoff integral." In Seismic Earth: Array Analysis of Broadband Seismograms, 149–69. Washington, D. C.: American Geophysical Union, 2005. http://dx.doi.org/10.1029/157gm10.

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Rondenay, Stéphane, Michael G. Bostock, and Karen M. Fischer. "Multichannel inversion of scattered teleseismic body waves: Practical considerations and applicability." In Seismic Earth: Array Analysis of Broadband Seismograms, 187–203. Washington, D. C.: American Geophysical Union, 2005. http://dx.doi.org/10.1029/157gm12.

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Conference papers on the topic "Teleseism"

1

Fernández-Ruiz, María R. R., Ethan L. Williams, Regina Magalhaes, Roel Vanthillo, Luís Costa, Zhongwen Zhan, Sonia Martin-Lopez, Miguel Gonzalez-Herraez, and Hugo F. Martins. "Teleseisms monitoring using chirped-pulse φOTDR." In Seventh European Workshop on Optical Fibre Sensors (EWOFS 2019), edited by Kyriacos Kalli, Gilberto Brambilla, and Sinead O. O'Keeffe. SPIE, 2019. http://dx.doi.org/10.1117/12.2539966.

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Campman, X., S. Rondenay, G. Herman, and A. Verdel. "Multichannel Teleseismic Data Processing and Imaging." In 68th EAGE Conference and Exhibition - Workshop Package. European Association of Geoscientists & Engineers, 2006. http://dx.doi.org/10.3997/2214-4609.201405162.

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Julian, Bruce R., and Gillian R. Foulger. "TELESEISMIC TOMOGRAPHY: EQUATION (1) IS WRONG." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-337154.

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Brigas, Carlos, Pedro Tadeu, José Batanero, and Mohammed El Homrani. "TELESEICT: IMPROVE ACCESS TO ALL STUDENTS." In 12th International Technology, Education and Development Conference. IATED, 2018. http://dx.doi.org/10.21125/inted.2018.2122.

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Roecker, S., B. Baker, and J. McLaughlin. "Full Waveform Teleseismic Tomography: Theory and Applications." In 72nd EAGE Conference and Exhibition - Workshops and Fieldtrips. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609.20149936.

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Driver, Damani. "TELESEISMIC DATA ACQUISITION ON THE COASTAL PLAIN OF NORTH CAROLINA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286830.

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Abe, Susumu, and Larry D. Brown. "CCP stacking and migration of teleseismic P‐SV converted wave." In SEG Technical Program Expanded Abstracts 2002. Society of Exploration Geophysicists, 2002. http://dx.doi.org/10.1190/1.1816828.

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E. Foley, J., M. N. Toksöz, and F. Batini. "Crustal imaging of the Larderello geothermal field, Italy, from teleseismic P waveforms." In 53rd EAEG Meeting. European Association of Geoscientists & Engineers, 1991. http://dx.doi.org/10.3997/2214-4609.201410826.

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L. Ronin, A., Y. P. Lukashin, V. P. Semenov, and R. Y. Tsukerman. "A New Technology for a Polarisation Processing of the Teleseismic Station Data." In 61st EAGE Conference and Exhibition. European Association of Geoscientists & Engineers, 1999. http://dx.doi.org/10.3997/2214-4609.201407890.

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Aranda, Nataly, and Marcelo Assumpção. "Crustal thickness in the northern Andes from teleseismic pP and sS precursors." In 13th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 26-29 August 2013. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2013. http://dx.doi.org/10.1190/sbgf2013-366.

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Reports on the topic "Teleseism"

1

Ellis, R. M., and Z. Hajnal. Investigations of the properties of the lithosphere using teleseismic waves. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205424.

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Shumway, Robert H. Advances in Mixed Signal Processing for Regional and Teleseismic Arrays. Fort Belvoir, VA: Defense Technical Information Center, August 2006. http://dx.doi.org/10.21236/ada458899.

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Snyder, D. Teleseismic investigations of the lithosphere beneath central Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2003. http://dx.doi.org/10.4095/214196.

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Ellis, R. M., and Z. Hajnal. Investigation of the properties of the Saskatchewan lithosphere using teleseismic waves. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/183974.

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Mangino, S., J. Ebel, and K. Priestley. Broadband Teleseismic Array Recording in the Adirondack Mountains, New York State. Fort Belvoir, VA: Defense Technical Information Center, April 1993. http://dx.doi.org/10.21236/ada267290.

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Alexander, Shelton S. Relationship between Near-Field and Teleseismic Observations of Seismic Source Parameters. Fort Belvoir, VA: Defense Technical Information Center, May 1985. http://dx.doi.org/10.21236/ada170751.

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Snyder, D. B. Mantle lithosphere structure beneath southeast Baffin Island, Nunavut from teleseismic studies. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/285385.

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McCaffrey, Robert, and Geoffrey Abers. SYN3: A Program for Inversion of Teleseismic Body Wave Forms on Microcomputers. Fort Belvoir, VA: Defense Technical Information Center, April 1988. http://dx.doi.org/10.21236/ada198940.

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Sweeney, J. J. Accuracy of teleseismic event locations in the Middle East and North Africa. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/514441.

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Dowla, F. U. Calibration of the Sonseca array with large magnitude regional and teleseismic events. Office of Scientific and Technical Information (OSTI), July 1996. http://dx.doi.org/10.2172/273791.

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