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Academic literature on the topic 'Synthethic seismograms'

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Published: 4 June 2021
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Journal articles on the topic "Synthethic seismograms"

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Davidson, Mark E., and Lawrence W. Braile. "Vibroseis recording techniques and data reduction from the Jemez Tomography Experiment." Bulletin of the Seismological Society of America 89, no. 5 (October 1, 1999): 1352–65. http://dx.doi.org/10.1785/bssa0890051352.

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Abstract The Jemez Tomography Experiment (JTEX) is a multidisciplinary study focused on the Valles Caldera and the Jemez Mountains, New Mexico. The objectives of the project are to create a high resolution crustal model of the subsurface structure of this silicic volcanic system and to develop an interpretation of its volcanic evolution. Use of Vibroseis sources in the acquisition of refraction/wide-angle reflection seismic data provided challenges beyond conventional explosive-source data. Processing of the JTEX Vibroseis data is an involved procedure consisting of sorting, cross-correlating, filtering, and stacking numerous individual seismograms in the production of final record sections. However, excellent results (high signal-to-noise seismograms at relatively small spacings) are obtainable with coherent arrivals at source-receiver distances of more than 60 km. The primary drawback in this approach lies in the massive volume of data that is necessary to produce record sections. One benefit of the Vibroseis source used during JTEX was a method to decrease effective seismogram spacing. This technique, dubbed a “source-offset” technique, provides smaller overall seismograph station spacing by moving the Vibroseis sources during acquisition and leaving deployed seismographs stationary. After station corrections, this method effectively decreases station spacings and increases detail in resulting record sections. Various shallow crustal heterogeneities create travel-time advances and delays that affect the source-offset data differently than single-source data. Synthetic modeling demonstrates small travel-time discrepancies associated with the source-offset technique. However, the addition of traces with smaller station intervals clarifies secondary arrivals within record sections and aids in interpretation of these arrivals with a minimum amount of field effort required.
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Gutowski, P. R., and S. Treitel. "The generalized one‐dimensional synthetic seismogram." GEOPHYSICS 52, no. 5 (May 1987): 589–605. http://dx.doi.org/10.1190/1.1442329.

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The normal‐incidence synthetic seismogram for an elastic and horizontally stratified medium has been thoroughly studied for a relatively restricted number of source and receiver locations. Most existing treatments are concerned with the special case in which the source as well as the receiver are situated at the surface; few attempts have dealt with completely arbitrary source and receiver geometries. Here we examine arbitrary geometries with the aid of the layer matrix approach, in which upgoing and downgoing wave motion at each interface is expressed in terms of z-transform polynomials. Such an approach brings to light a number of physically important relations that the model satisfies. For example, the synthetic seismograms generally have the familiar autoregressive‐moving average (ARMA) structure for the surface‐source, surface‐receiver case. For particular combinations of reflection coefficients, however, the seismograms reduce to purely autoregressive (AR) representations. In all cases, we work out the delay properties that the respective autoregressive and moving average components must obey. The present solutions are easily reduced to a useful form for practical computation. One application of particular current interest is the simulation of vertical seismic profiling (VSP) surveys, where we have extended the theoretical treatment to include expressions for the derivatives of the seismograms with respect to the reflection coefficients. The resulting time series, which we call Jacobograms, are indicative of the sensitivity of the seismogram to the various reflection coefficients and are thus diagnostic of the model’s behavior.
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Isaac, J. Helen, and Don C. Lawton. "A case study showing the value of multioffset synthetic seismograms in seismic data interpretation." Interpretation 4, no. 4 (November 1, 2016): T455—T459. http://dx.doi.org/10.1190/int-2016-0036.1.

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A baseline 3D3C seismic survey was acquired in May 2014 at a Field Research Station in Southern Alberta, Canada, which is the site of experimental [Formula: see text] injection into an Upper Cretaceous sandstone at approximately 300 m depth. We have created synthetic seismograms from sonic and density logs to identify reflectors seen on the processed seismic data. The high-amplitude positive response (peak) at the top of the Upper Cretaceous Milk River Formation sandstone on the normal incidence PP synthetic seismogram does not match the response seen on the migrated PP seismic data, which is a very low amplitude peak. For such a high impedance, low Poisson’s ratio sandstone, the Zoeppritz equations predict a high-amplitude reflection coefficient at zero offset, then a decrease in amplitude, and even a change in polarity with increasing source-receiver offset. To match the stacked seismic data better, we have created offset synthetic seismograms using P- and S-wave sonic logs and density logs. The character of the top Milk River reflection on the seismic data stacked using all offset traces resembles that observed on the stacked offset synthetic seismogram, which is a similar low-amplitude peak. The character of the top Milk River reflection on the seismic data stacked using only near-offset traces to 250 m looks like that seen on the normal incidence synthetic seismogram.
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Langston, Charles A., and Chang-Eob Baag. "The validity of ray theory approximations for the computation of teleseismic SV waves." Bulletin of the Seismological Society of America 75, no. 6 (December 1, 1985): 1719–27. http://dx.doi.org/10.1785/bssa0750061719.

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Abstract Teleseismic SV waves have been generally ignored in wave propagation and source studies because of known complications in wave propagation for structure near the source and near the receiver. The validity of common optic ray and WKBJ seismogram methods for computing SV synthetic seismograms is examined by computing synthetic seismograms using these techniques and comparing them to SV synthetics produced from a wavenumber integration technique. Both ray methods give a poor approximation to the wave propagation for distances less than 60°. Diffracted Sp and the SPL wave interfere with near-source phases, such as S, pS, and sS for a shallow seismic source, producing anomalously high amplitudes and complex waveforms in agreement with observational experience. Because of the Moho Sp and diffracted Sp phases, the vertical component of motion shows greater distortion, relative to the ray theory result, than does the radial component of motion. Ray theory appears to be appropriate for the initial 20 sec of the SV wave train from a shallow source for ranges greater than 60°. SV waves from deep sources are less affected by diffracted Sp and SPL than SV from shallow sources.
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SANTOSA, BAGUS JAYA. "S WAVE VELOCITY STRUCTURE IN NONTECTONIC SE ASIA BY SEISMOGRAM ANALYSIS OF THE EARTHQUAKES IN SUMATRA–JAVA AT TATO STATION, TAIWAN." Journal of Earthquake and Tsunami 04, no. 03 (September 2010): 181–95. http://dx.doi.org/10.1142/s1793431110000911.

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The S wave velocity structure beneath South-East Asia and South China Sea due to earthquakes in Sumatra–Java subduction zone has been investigated through seismogram analysis in time domain and three components simultaneously, using data recorded in TATO, Taiwan seismological station. The synthetic seismogram was calculated using the GEMINI method, which consists of the earth model and the CMT solution of the earthquake. A low-pass filter with corner frequency of 20 mHz is imposed to the seismograms. Response file inversion subjected on the measured seismogram will compare the measured and the synthetic seismogram in the same unit. The seismogram comparison indicated that the synthetic seismogram constructed from PREMAN earth model deviates greatly from the measured one. The deviation occurred on the arrival time of surface wave of Rayleigh and Love as well as S body waves. The S, Love, and Rayleigh waveform deviations on arrival time or oscillation number are solved by changing the gradient of βh into positive in the upper mantle layers, and corrections for zero-order coefficients of β speed polynomial in every earth mantle layers. The interpretation results of seismogram analysis using waveform comparison indicate that the nontectonic South-East Asia area in front of subduction zone has strong negative correction of βv in the upper mantle and with smaller factor also at earth layers below. This result shows stronger vertical anisotropy than that indicated by the PREMAN earth model.
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Sun, Robert, George A. McMechan, Hsu‐Hong Hsiao, and Jinder Chow. "Separating P‐ and S‐waves in prestack 3D elastic seismograms using divergence and curl." GEOPHYSICS 69, no. 1 (January 2004): 286–97. http://dx.doi.org/10.1190/1.1649396.

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The reflected P‐ and S‐waves in a prestack 3D, three‐component elastic seismic section can be separated by taking the divergence and curl during finite‐difference extrapolation. The elastic seismic data are downward extrapolated from the receiver locations into a homogeneous elastic computational model using the 3D elastic wave equation. During downward extrapolation, divergence (a scalar) and curl (a three‐component vector) of the wavefield are computed and recorded independently, at a fixed depth, as a one‐component seismogram and a three‐component seismogram, respectively. The P‐ and S‐velocities in the elastic computational model are then split into two independent models. The divergence seismogram (containing P‐waves only) is then upward extrapolated (using the scalar wave equation) through the P‐velocity model to the original receiver locations at the surface to obtain the separated P‐waves. The x‐component, y‐component, and z‐component seismograms of the curl (containing S‐waves only) are upward extrapolated independently (using the scalar wave equation) through the S‐velocity model to the original receiver locations at the surface to obtain the separated S‐waves. Tests are successful on synthetic seismograms computed for simple laterally heterogeneous 2D models with a 3D recording geometry even if the velocities used in the extrapolations are not accurate.
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Kwak, Sangmin, Hyunggu Jun, Wansoo Ha, and Changsoo Shin. "Temporal windowing and inverse transform of the wavefield in the Laplace-Fourier domain." GEOPHYSICS 78, no. 5 (September 1, 2013): R207—R222. http://dx.doi.org/10.1190/geo2012-0249.1.

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Temporal windowing is a valuable process, which can help us to focus on a specific event in a seismogram. However, applying the time window is difficult outside the time domain. We suggest a windowing method which is applicable in the Laplace-Fourier domain. The window function we adopt is defined as a product of a gain function and an exponential damping function. The Fourier transform of a seismogram windowed by this function is equivalent to the partial derivative of the Laplace-Fourier domain wavefield with respect to the complex damping constant. Therefore, we can obtain a windowed seismogram using the partial derivatives of the Laplace-Fourier domain wavefield. We exploit the time-windowed wavefield, which is modeled directly in the Laplace-Fourier domain, to reconstruct subsurface velocity model by waveform inversion in the Laplace-Fourier domain. We present the windowed seismograms by introducing an inverse Laplace-Fourier transform technique and demonstrate the effect of temporal windowing in a synthetic Laplace-Fourier domain waveform inversion example.
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SANTOSA, BAGUS JAYA. "INVESTIGATING S VELOCITY STRUCTURE OF THE UPPER MANTLE BENEATH WEST INDONESIA USING SEISMOGRAM ANALYSIS OF TWO STRONG SOUTH JAVA EARTHQUAKES IN MALAYSIAN SEISMOLOGICAL NETWORK." Journal of Earthquake and Tsunami 04, no. 04 (December 2010): 321–39. http://dx.doi.org/10.1142/s1793431110000881.

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This research investigated the S speed structure in the upper mantle beneath West Indonesia by analyzing the seismogram triggered by the C052606A and C071706B earthquakes in South Java and recorded at the Malaysian seismological network MY. The method used is waveform comparison between the measured seismogram and the synthetic one in the time domain and three Cartesian components simultaneously, instead of travel time data or dispersion curve, which are commonly used by other seismologists. The seismogram comparison was conducted in the same unit and a low-pass filter with 20 mHz corner frequency was applied to both seismograms. Seismogram analysis shows very strong deviations in the arrival times and amplitudes of the Love and Rayleigh surface waveforms. To solve the observed deviation, a correction on the earth structure covering the speed gradient of βh and the value of zero-order coefficients for the βh and βv in the earth upper mantle is required. The research's result shows that the area of East Sumatra and Borneo has negative correction of S speed structure in the upper mantle layers, compared to PREMAN standard earth model. This result is different from other seismological result.
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Cheng, Guangsen, Xingyao Yin, Zhaoyun Zong, Tongxing Xia, Jianli Wang, and Haojie Liu. "Seismic inversion using complex spherical-wave reflection coefficient at different offsets and frequencies." GEOPHYSICS 87, no. 2 (January 10, 2022): R183—R192. http://dx.doi.org/10.1190/geo2020-0787.1.

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Compared with the plane-wave reflection coefficient, the spherical-wave reflection coefficient (SRC) can more accurately describe the reflected wavefield excited by a point source, especially in the case of low seismic frequency and short travel distance. However, unlike the widely used plane-wave amplitude-variation-with-offset/frequency (AVO/AVF) inversion, the practical application of spherical-wave AVO/AVF inversion in multilayer elastic media is still in the exploratory stage. One of the difficulties is how to fully use the amplitude and phase information of the complex-valued SRC and the spherical-wave response property of each frequency component to obtain the spherical-wave synthetic seismogram in multilayer elastic media. In view of this, we have developed a complex convolution model considering the amplitude and phase information of an SRC to obtain the complex synthetic seismogram of a certain frequency component. A simple harmonic superposition method is further developed. By superposing the complex synthetic seismograms of different frequency components, the synthetic seismogram of the full-frequency band can be obtained. In addition, a novel three-parameter SRC in terms of P- and S-wave moduli and density is derived. Based on the SRC and complex seismic traces with different offsets (or incidence angles) and frequency components, an inversion approach of complex spherical-wave amplitude and phase variation with offset and frequency is proposed. A noisy synthetic data example verifies the robustness of our complex spherical-wave inversion approach. Field data examples indicate that the P- and S-wave moduli estimated by the complex spherical-wave inversion approach can reasonably match the filtered well-logging data. Considering spherical waves rather than plane waves can improve the accuracy of seismic inversion results.
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Nowack, Robert. "Gaussian beam synthetic seismograms." Journal of the Acoustical Society of America 79, S1 (May 1986): S14. http://dx.doi.org/10.1121/1.2023080.

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Dissertations / Theses on the topic "Synthethic seismograms"

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Marson-Pidgeon, Katrina Ann, and katrina marson-pidgeon@anu edu au. "Seismogram synthesis for teleseismic events with application to source and structural studies." The Australian National University. Research School of Earth Sciences, 2001. http://thesis.anu.edu.au./public/adt-ANU20010925.152548.

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The aim of this thesis is to develop procedures for the modelling and inversion of teleseismic P and S waveforms which are as flexible as possible. This flexibility is necessary in order to obtain accurate source depth and mechanism estimates for small to moderate size events, such as those that are relevant in the context of monitoring the Comprehensive Nuclear-Test-Ban Treaty (CTBT). ¶ The main challenge for extending source depth and mechanism inversion methods to smaller events is to ensure that sufficiently accurate synthetic seismograms are available for comparison with observed records. An accurate phase-adaptive reflectivity method has therefore been developed, against which the performance of less computationally intensive approximations can be judged. The standard reflectivity method has been modified to allow for different crustal and upper mantle structures at the source and receiver, and the full effects of reverberations and conversions in these structures can be allowed for. Core reflections and refractions can also be included; these phases can become important at certain distance ranges. A slowness bundle approach has been developed, where a restricted slowness integration about the geometric slowness for the direct wave is undertaken at each frequency, allowing accurate results to be obtained whilst avoiding the expense of a full reflectivity technique. ¶ Inversion using the neighbourhood algorithm (NA) is performed for source depth, mechanism and time function, by modelling direct P and S and their surface reflections (pP, sP and pS, sS) at teleseismic distances. Both SV and SH data are exploited in the inversion, in addition to P data, in order to obtain improved constraints on the source mechanism, including any isotropic component. Good results are obtained using a simple generalised ray scheme, however, the use of a flexible derivative-free inversion method means that more accurate synthetics are able to be used in the inversion where appropriate. The NA makes use of only the rank of the data misfits, so that it is possible to employ any suitable misfit criterion. In the few cases where control on the source mechanism is limited, good depth resolution is still usually obtained. ¶The structures near the source and receiver play an important role in shaping the detail of the teleseismic waveforms. Although reasonable results can be achieved with simple synthetics and a standard velocity model, significant improvement can be made by modifying the representation of structure near the source and receiver. In the case of sub-oceanic events it is important to allow for the effects of water reverberations. The crustal structure near the receiver can also have quite a large influence on the waveforms through reverberations and conversions. This is exploited in receiver function inversion, which is again accomplished using the NA approach.
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Roberts, Samuel St John. "An investigation of synthetic seismograms for the Bookabourdie gas/oil field, Cooper Basin /." Title page, contents and abstract only, 1989. http://web4.library.adelaide.edu.au/theses/09SB/09sbr647.pdf.

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McClain, Jason. "A shallow Vibroseis seismic reflection study in the Rough Creek Fault Zone using density and resistivity based synthetic seismograms /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1240698971&sid=11&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Papadimitriou, Panayotis. "Etude de la structure du manteau supérieur de l'Europe et modélisation des ondes de volume engendrées des séismes égéens." Paris 7, 1988. http://www.theses.fr/1988PA077133.

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On construit un modèle de vitesse qui correspond a la structure du manteau supérieur de l'Europe en utilisant des stations européennes les ondes de volume p et pp et des séismes qui ont lieu dans le domaine égéen. Pour cela on utilise la méthode des faisceaux gaussiens. Il est alors possible pour des séismes dont D<30**(O) de déterminer leur mécanisme au foyer et leur intensité
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Afsar, Fatima. "ANALYSIS AND INTERPRETATION OF 2D/3D SEISMIC DATA OVER DHURNAL OIL FIELD, NORTHERN PAKISTAN." Thesis, Uppsala universitet, Geofysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-202565.

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The study area, Dhurnal oil field, is located 74 km southwest of Islamabad in the Potwar basin of Pakistan. Discovered in March 1984, the field was developed with four producing wells and three water injection wells. Three main limestone reservoirs of Eocene and Paleocene ages are present in this field. These limestone reservoirs are tectonically fractured and all the production is derived from these fractures. The overlying claystone formation of Miocene age provides vertical and lateral seal to the Paleocene and Permian carbonates. The field started production in May 1984, reaching a maximum rate of 19370 BOPD in November 1989. Currently Dhurnal‐1 (D-1) and Dhurnal‐6 (D-6) wells are producing 135 BOPD and 0.65 MMCF/D gas. The field has depleted after producing over 50 million Bbls of oil and 130 BCF of gas from naturally fractured low energy shelf carbonates of the Eocene, Paleocene and Permian reservoirs. Preliminary geological and geophysical data evaluation of Dhurnal field revealed the presence of an up-dip anticlinal structure between D-1 and D-6 wells, seen on new 2003 reprocessed data. However, this structural impression is not observed on old 1987 processed data. The aim of this research is to compare and evaluate old and new reprocessed data in order to identify possible factors affecting the structural configuration. For this purpose, a detailed interpretation of old and new reprocessed data is carried out and results clearly demonstrate that structural compartmentalization exists in Dhurnal field (based on 2003 data). Therefore, to further analyse the available data sets, processing sequences pertaining to both vintages have been examined. After great effort and detailed investigation, it is concluded that the major parameter giving rise to this data discrepancy is the velocity analysis done with different gridding intervals. The detailed and dense velocity analysis carried out on the data in 2003 was able to image the subtle anticlinal feature, which was missed on the 1987 processed seismic data due to sparse gridding. In addition to this, about 105 sq.km 3D seismic data recently (2009) acquired by Ocean Pakistan Limited (OPL) is also interpreted in this project to gain greater confidence on the results. The 3D geophysical interpretation confirmed the findings and aided in accurately mapping the remaining hydrocarbon potential of Dhurnal field.
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ONeal, Ryan J. "Seismic and Well Log Attribute Analysis of the Jurassic Entrada/Curtis Interval Within the North Hill Creek 3D Seismic Survey, Uinta Basin, Utah, A Case History." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1025.

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3D seismic attribute analysis of the Jurassic Entrada/Curtis interval within the North Hill Creek (NHC) survey has been useful in delineating reservoir quality eolian-influenced dune complexes. Amplitude, average reflection strength and spectral decomposition appear to be most useful in locating reservoir quality dune complexes, outlining their geometry and possibly displaying lateral changes in thickness. Cross sectional views displaying toplap features likely indicate an unconformity between Entrada clinoforms below and Curtis planar beds above. This relationship may aid the explorationist in discovering this important seismic interval. Seismic and well log attribute values were cross plotted and have revealed associations between these data. Cross plots are accompanied by regression lines and R2 values which support our interpretations. Although reservoir quality dune complexes may be delineated, the Entrada/Curtis play appears to be mainly structural. The best producing wells in the survey are associated with structural or stratigraphic relief and the thickest Entrada/Curtis intervals. Structural and stratigraphic traps are not always associated with laterally extensive dune complexes. Time structure maps as well as isochron maps have proven useful in delineating the thickest and/or gas prone portions of the Entrada/Curtis interval as well as areas with structural and stratigraphic relief. We have observed that the zones of best production are associated with low gamma ray (40-60 API) values. These low values are associated with zones of high amplitude. Thus, max peak amplitude as a seismic attribute may delineate areas of higher sand content (i.e. dune complexes) whereas zones of low amplitude may represent areas of lower sand content (i.e. muddier interdune or tidal flat facies). Lack of significant average porosity does not seem to be related to a lack of production. In fact, the best producing wells have been drilled in Entrada/Curtis intervals where average porosity is near 4 %. There are however zones within the upper portion of the Entrada/Curtis that are 40 ft. (12.2 m) thick and have porosities between 14% and 20%. By combining derived attribute maps with observed cross plot relationships, it appears that the best producing intervals within the Entrada/Curtis are those associated with high amplitudes, API values from 40-60 and structural relief.
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Marson-Pidgeon, Katrina Ann. "Seismogram synthesis for teleseismic events with application to source and structural studies." Phd thesis, 2001. http://hdl.handle.net/1885/47797.

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The aim of this thesis is to develop procedures for the modelling and inversion of teleseismic P and S waveforms which are as flexible as possible. This flexibility is necessary in order to obtain accurate source depth and mechanism estimates for small to moderate size events, such as those that are relevant in the context of monitoring the Comprehensive Nuclear-Test-Ban Treaty (CTBT). ¶ The main challenge for extending source depth and mechanism inversion methods to smaller events is to ensure that sufficiently accurate synthetic seismograms are available for comparison with observed records. An accurate phase-adaptive reflectivity method has therefore been developed, against which the performance of less computationally intensive approximations can be judged. The standard reflectivity method has been modified to allow for different crustal and upper mantle structures at the source and receiver, and the full effects of reverberations and conversions in these structures can be allowed for. Core reflections and refractions can also be included; these phases can become important at certain distance ranges. A slowness bundle approach has been developed, where a restricted slowness integration about the geometric slowness for the direct wave is undertaken at each frequency, allowing accurate results to be obtained whilst avoiding the expense of a full reflectivity technique. ¶ ...
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ZHENG, SHI-YUE, and 鄭世岳. "Synthetic seismograms for directionally-drilled wells." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/33955056840600065777.

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(Ted)Kung, Shih-ling, and 龔士林. "Pseudo-Synthetic Seismograms from Neutron and Resistivity Logs." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/78096242800679753010.

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博士
國立成功大學
資源工程學系
102
The direct cross-plotting technique that involves a graph of resistivity or neutron log data versus sonic log data is often used to create a pseudo-sonic log. With the resulting transform, a pseudo-synthetic seismogram can then be generated to aid seismic interpreters. However, pseudo-synthetic seismograms generated in this way often do not match the standard synthetic seismograms (made from the sonic and density logs) if either the “gas effect” for the neutron log versus the sonic log cross-plot or the “hydrocarbon effect” for the resistivity log versus the sonic log cross-plot is not corrected. The compensated neutron log (CNL) and the short normal resistivity log (SN) were carefully compared to a borehole-compensated sonic log (BHC) from the same well in Taiwan. Semi-empirical relationships from CNL versus BHC and SN versus BHC plots were reviewed from the literature. Then, we developed a method to transform a neutron log into a pseudo-sonic log and a resistivity log into a pseudo-sonic log by splicing together several continuous sections of the best-fit line functions according to formation tops. Additionally, sandstones in which the gas effect or hydrocarbon effect caused the data to be scattered were separately plotted. The presented examples show that the new method produces a pseudo-sonic curve that would generate the pseudo-synthetic seismogram most similar to the standard synthetic seismogram according to frequency, amplitude and polarity. Blind tests in northwestern Taiwan were performed in two wells to test the effectiveness of the new techniques, and the results were good. The method has also been proven to be applicable in carbonate-dominated log sections, as evidenced by application of the techniques to a well in Kansas, USA. The techniques presented in this dissertation can be used to improve the conventional transform of a neutron log into a pseudo-sonic log or a resistivity log into a pseudo-sonic log by employing the direct cross-plotting technique. This, in turn, may be particularly useful for oil and gas exploratory and development areas where neutron logs or resistivity logs are more prevalent than sonic logs.
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Ha, Joseph. "Computation of synthetic seismograms in layered earth models." Phd thesis, 1985. http://hdl.handle.net/1885/140505.

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Books on the topic "Synthethic seismograms"

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Peck, Lindamae. Review of methods for generating synthetic seismograms. [Hanover, N.H: U.S. Army Cold Regions Research & Engineering Laboratory], 1985.

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M, Allen J. Benchmarking the two-dimensional finite difference synthetic seismogram code. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1991.

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M, Allen J. Benchmarking the two-dimensional finite difference synthetic seismogram code. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1991.

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M, Allen J. Calculation of 3-dimensional synthetic seismograms on the connection machine. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1989.

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M, Allen J. Calculation of 3-dimensional synthetic seismograms on the connection machine. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1989.

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Marinus Wilhelmus Josephus Maria Bastians. Fast evaluation of complete synthetic SH seismograms based on asymptotic mode theory =: Snelle evaluatie van complete synthetische SH seismogrammen gebaseerd op de asymptotische theorie van eigentrillingen. [Utrecht: Instituut voor Aardwetenschappen de Rijksuniversiteit te Utrecht, 1986.

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Geological Survey (U.S.), ed. User's manual for RAY84/R83PLT interactive two-dimensional raytracing/synthetic seismogram package. Menlo Park, Calif: U.S. Dept. of the Interior, Geological Survey, 1988.

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Book chapters on the topic "Synthethic seismograms"

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Sinvhal, Amita, and Harsha Sinvhal. "Simulation of Synthetic Seismograms." In Seismic Modelling and Pattern Recognition in Oil Exploration, 63–90. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2570-3_4.

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Panza, Giuliano F. "Attenuation Measurements by Multimode Synthetic Seismograms." In Digital Seismology and Fine Modeling of the Lithosphere, 79–115. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-6759-6_5.

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Sleeman, Reinoud. "Synthetic Seismograms for 3-D Inhomogeneous Media." In Digital Seismology and Fine Modeling of the Lithosphere, 341–49. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-6759-6_14.

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Nowack, Robert L. "Calculation of Synthetic Seismograms with Gaussian Beams." In Seismic Motion, Lithospheric Structures, Earthquake and Volcanic Sources: The Keiiti Aki Volume, 487–507. Basel: Birkhäuser Basel, 2003. http://dx.doi.org/10.1007/978-3-0348-8010-7_4.

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Florsch, N., D. Fäh, P. Suhadolc, and G. F. Panza. "Complete Synthetic Seismograms for High-Frequency Multimode SH-waves." In Source Mechanism and Seismotectonics, 529–60. Basel: Birkhäuser Basel, 1991. http://dx.doi.org/10.1007/978-3-0348-8654-3_12.

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Wu, Ru-Shan. "Synthetic Seismograms in Heterogeneous Media by One-return Approximation." In Seismic Waves in Laterally Inhomogeneous Media, 155–73. Basel: Birkhäuser Basel, 1996. http://dx.doi.org/10.1007/978-3-0348-9213-1_8.

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Geller, Robert J., Nozomu Takeuchi, Hiromitsu Mizutani, and Nobuyasu Hirabayashi. "Methods for Computing Synthetic Seismograms and Estimating Their Computational Error." In Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, 754–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_122.

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Schmidt, Henrik, and Gerard Tango. "Numerically Efficient Full Wavefield Approach to Synthetic Seismogram Computation." In Acoustical Imaging, 187–98. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2523-9_17.

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Brokešová, Johana. "Construction of Ray Synthetic Seismograms Using Interpolation of Travel Times and Ray Amplitudes." In Seismic Waves in Laterally Inhomogeneous Media Part II, 503–38. Basel: Birkhäuser Basel, 1996. http://dx.doi.org/10.1007/978-3-0348-9049-6_6.

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Kaneko, Ryosuke, Hiromichi Nagao, Shin-ichi Ito, Kazushige Obara, and Hiroshi Tsuruoka. "Convolutional Neural Network to Detect Deep Low-Frequency Tremors from Seismic Waveform Images." In Lecture Notes in Computer Science, 31–43. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75015-2_4.

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AbstractThe installation of dense seismometer arrays in Japan approximately 20 years ago has led to the discovery of deep low-frequency tremors, which are oscillations clearly different from ordinary earthquakes. As such tremors may be related to large earthquakes, it is an important issue in seismology to investigate tremors that occurred before establishing dense seismometer arrays. We use deep learning aiming to detect evidence of tremors from past seismic data of more than 50 years ago, when seismic waveforms were printed on paper. First, we construct a convolutional neural network (CNN) based on the ResNet architecture to extract tremors from seismic waveform images. Experiments applying the CNN to synthetic images generated according to seismograph paper records show that the trained model can correctly determine the presence of tremors in the seismic waveforms. In addition, the gradient-weighted class activation mapping clearly indicates the tremor location on each image. Thus, the proposed CNN has a strong potential for detecting tremors on numerous paper records, which can enable to deepen the understanding of the relations between tremors and earthquakes.
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Conference papers on the topic "Synthethic seismograms"

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Saleh, Khaled, Aly Morad, Chiara Cavalleri, Emad Abdel Hakim, Mohamed Farouk, Eslam Atwa, Mohamed Ameen, Youssif Youssif, and Kareem Mamdouh. "DERIVING SYNTHETIC BULK DENSITY USING FAST NEUTRON CROSS-SECTION IN A LOG-INTEGRATED APPROACH FROM SLIM PULSED NEUTRON LOGGING IN CASED-HOLE ENVIRONMENT." In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0098.

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Recent advancement in logging technology and data analytics allows measuring a comprehensive set of formation petrophysical properties and rock composition in cased boreholes. State-of-the-art pulsed neutron logging technology and processing algorithms record capture and inelastic elemental spectroscopy for matrix parameters, and detailed mineralogy characterization, total organic content estimation, and carbon/oxygen analysis, simultaneously with formation sigma, neutron porosity, and fast neutron cross-section. The fast neutron cross-section (FNXS) is a new formation nuclear property introduced by the advanced pulsed neutron tool that is independent of thermal and capture cross-section and highly sensitive to gas regardless of hydrogen index. Unlike thermal neutron capture cross-section, for which certain isotopes have extremely high values (such as Cl, B, and Gd), fast neutron cross-sections of all isotopes are more or less similar. Thus, FNXS is approximately proportional to atom density. Therefore, this new nuclear property has functionality similar to that of the bulk density (gamma-gamma density measurement). A local relationship can be defined to convert the FNXS into bulk density when the lithology and fluid properties are known, and calibration is possible. Otherwise, a more comprehensive assessment of bulk density can be performed by integrating FNXS with the other outputs from the slim pulsed neutron logging into a mineral solver. While solving for rock and fluid volumes from the cased-hole logs, a reconstructed bulk density may be derived in a cased-hole environment. This synthetic bulk density can be used by geophysicists to develop synthetic seismograms to properly map formation tops with surface seismic data. Since the pulsed neutron measurements follow linear volumetric law equations, they can be directly integrated into a mineral solver together with the elemental spectroscopy outputs to create a synthetic bulk density, together with the other answers. A blind comparison was done between synthetic bulk density from the cased-hole log-based mineral solver and a measured openhole density, showing a strong correlation in a three-phase fluid reservoir (gas, oil, and water). A synthetic seismogram is an essential tool when geophysicists fine-tune surface seismic data. This seismogram is developed using bulk density and compressional slowness to derive acoustic impedance, where sometimes bulk density is missing. As a result, an old approach to estimate bulk density using Gardner’s equation has certain limitations in complex environments. The new formation nuclear property that is now available in the slim pulsed neutron technology can be leveraged to provide a more robust and quality-controlled synthetic bulk density derived through FNXS integrated with the other pulsed neutron and spectroscopy outputs.
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Loewenthal, Dan, and Paul L. Stoffa. "Synthetic seismograms by dereverberating sources." In SEG Technical Program Expanded Abstracts 1986. Society of Exploration Geophysicists, 1986. http://dx.doi.org/10.1190/1.1892925.

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Hanyga, A., and H. B. Helle. "Synthetic seismograms from extended ray tracing." In 53rd EAEG Meeting. European Association of Geoscientists & Engineers, 1991. http://dx.doi.org/10.3997/2214-4609.201410875.

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Szaraniec, E. "Decomposition of Synthetic Seismograms - Land Conditions." In 62nd EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2000. http://dx.doi.org/10.3997/2214-4609-pdb.28.p151.

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Smith, M. C., S. D. Goodfellow, J. Huang, S. C. Maxwell, J. Teff, B. Kennedy, and B. Bayliss. "Microseismic Quality Control Using Synthetic Seismograms." In Unconventional Resources Technology Conference. Tulsa, OK, USA: American Association of Petroleum Geologists, 2016. http://dx.doi.org/10.15530/urtec-2016-2461784.

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Taylor, D. B., and R. G. K. Johnston. "Synthetic Seismograms for Testing Multiple RemovalMathl Algorithms." In 62nd EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2000. http://dx.doi.org/10.3997/2214-4609-pdb.28.c44.

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Sen, Mrinal K., and L. Neil Frazer. "Multifold phase space path integral synthetic seismograms." In SEG Technical Program Expanded Abstracts 1988. Society of Exploration Geophysicists, 1988. http://dx.doi.org/10.1190/1.1892175.

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Ioup, Juliette W., A. K. M. Sarwar, and George E. Ioup. "Inversion of synthetic seismograms from fourier components." In SEG Technical Program Expanded Abstracts 1986. Society of Exploration Geophysicists, 1986. http://dx.doi.org/10.1190/1.1893131.

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Phadke, Suhas, Dheeraj Bhardwaj, and Sudhakar Yerneni. "Marine synthetic seismograms using elastic wave equation." In SEG Technical Program Expanded Abstracts 2000. Society of Exploration Geophysicists, 2000. http://dx.doi.org/10.1190/1.1815941.

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Chandra, N., and A. D. Goel. "Improving Velocity Estimation for Generation of Synthetic Seismograms." In 62nd EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2000. http://dx.doi.org/10.3997/2214-4609-pdb.28.d42.

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Reports on the topic "Synthethic seismograms"

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Salzberg, David H., and Margaret E. Marshall. Seismic Source Locations and Parameters for Sparse Networks by Matching Observed Seismograms to Semi-Empirical Synthetic Seismograms. Fort Belvoir, VA: Defense Technical Information Center, December 2007. http://dx.doi.org/10.21236/ada481295.

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Hu, K., T. A. Brent, D. R. Issler, and Z. Chen. Synthetic seismograms from borehole seismic data and well logs, Beaufort-Mackenzie Basin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296213.

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Wu, R. S., S. Jin, X. B. Xie, and T. Lay. Synthetic Seismograms in Heterogeneous Elastic Waveguides and Applications in Investigating LG-Wave Propagation. Fort Belvoir, VA: Defense Technical Information Center, March 1998. http://dx.doi.org/10.21236/ada347897.

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Yang, X. MineSeis -- A MATLAB{reg_sign} GUI program to calculate synthetic seismograms from a linear, multi-shot blast source model. Office of Scientific and Technical Information (OSTI), April 1998. http://dx.doi.org/10.2172/677033.

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VandenBerg, R. D., P. B. Kabanov, K E Dewing, and E. A. Atkinson. Geological and geochemical data from the Canadian Arctic Islands, part XVIII: XRF and TOC data, and formation tops in exploration wells from the Devonian clastic wedge and underlying strata, Northwest Territories and Nunavut. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329642.

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This collection of data comprises new XRF data, TOC data, and a new table of formation tops for the lower portion of the Devonian clastic wedge (Weatherall, Cape de Bray and Blackley formations sensu Embry and Klovan, 1976) and the underlying basinal and carbonate-platform strata of variable Ordovician to Lower-Middle Devonian age. Main results include ED-XRF data for 15 well sections within the N.W.T. jurisdiction of the SW Arctic Archipelago. These XRF data were obtained in 2018- 2020 through non-destructive measurements of drillhole cutting samples using a Bruker Tracer IV instrument. Testing of these samples has been restricted to preserve them for future study as they are irreplaceable. The goal of using the non destructives XFR has given us a methodology that does not harm these samples. We find this to be a reasonable method when data is required but no destructive testing is permitted, such as in these legacy wells. Reading acquisition procedure and instrument calibrations are discussed herein. These XRF logs cover cumulatively 12,538 m of well sections, which is the best attainable physical coverage for these strata in the absence of representative cores. For each section surveyed with XRF, we provide graphical striplogs with geophysical logs, descriptive lithology, XRF elemental logs, biostratigraphic data, and, selectively, synthetic seismograms and TOC data. Scientific discussion based on these results is a subject of a separate paper-in-preparation, (Kabanov, P. 2020.)
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