Дисертації з теми "Seismic swarms"
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Minetto, Riccardo. "Essaims sismiques : comparaison des séismes naturels et induits." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALU009.
Повний текст джерелаA seismic sequence is a cluster of earthquakes that occur in close spatial and temporal proximity. One type of seismic sequence is a seismic swarm, which is typically characterized by earthquakes whose location changes over time and by the absence of a single, dominant, large earthquake.In this thesis, I investigate the spatio-temporal evolution of natural and induced seismic swarms with the aim of identifying the physical processes that drive them and characterizing the properties of the activated fault systems. More specifically, I focus on three key aspects of the seismic activity: temporal evolution of the seismicity rate, earthquake location and frequency-magnitude distribution. The study focuses on two seismic swarms. The first one, of natural origin, occurred in the Maurienne valley (French Alps) between 2017 and 2019, while the second one was induced by hydraulic fracturing operations at Preston New Road, UK, in 2019. To ensure a high-resolution analysis of these sequences, I first created improved catalogs, which incorporate newly detected events and more accurate magnitudes and hypocenter locations.The migration of earthquakes during the Maurienne swarm suggests that this sequence may have been triggered by a combination of multiple pulses of high-pressure fluids and earthquake-to-earthquake interactions. Additionally, the proportion of small and large events (i.e., the b-value of the Gutenberg-Richter law) varies in space, and this change may be linked to the size of the active fault systems.In addition to the study of the seismic activity, I applied ambient noise interferometry to assess if stress changes during the Maurienne swarm produced detectable variations in seismic wave velocity. The velocity changes appear to be primarily influenced by a seasonal process possibly related to pore pressure variations due to rainfall. However, during the main period of seismic activity, such changes may also be accentuated by the continuous ground shaking resulting from the prolonged occurrence of earthquakes.The Preston New Road sequence is characterized by a seismicity rate and a frequency-magnitude distribution that gradually evolve as fluids are repeatedly injected and the seismogenic volume expands in size. This suggests that the seismic activity during an injection stage depends on the injection history of past stages.The Maurienne and Preston New Road sequences are just two examples of the broader phenomenon of seismic and induced swarms. Nonetheless, these two sequences illustrate that induced and natural swarms can exhibit similar patterns in their spatio-temporal evolution, such as earthquake migration and the dependence of the b-value on the scale of the fault system. This emphasizes the potential of applying the knowledge gained from studying one type of swarm to improve our understanding of the other
Rößler, Dirk, Stephan Hiemer, Christoph Bach, Elise Delavaud, Frank Krüger, Matthias Ohrnberger, David Sauer, Frank Scherbaum, and Daniel Vollmer. "Small-aperture seismic array monitors Vogtland earthquake swarm in 2008/09." Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2009/2918/.
Повний текст джерелаAdiya, Munkhsaikhan. "Seismic activity near Ulannbaatar : implication for seismic hazard assessment." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAH007/document.
Повний текст джерелаWe observe since 2005 a high seismic activity at 10 km from Ulaanbaatar that allowed us to identify a new active fault, Emeelt, in the field. After computing a 3D velocity model, I applied Double-Difference tomography to obtain a precise localization of earthquakes. They trace at least three parallel branches oriented N147° like the fault seen at surface. The seismic activity on the Main Emeelt Fault (MEF) is along at least 15 km, on the West and East branches, less active, along 10 km. The depth of the seismicity extends between 4 and 15 km. The activity seems concentrated at the intersection with Mesozoic faults and Vp/Vs contrast suggests the presence of fluids. The 10 swarms identified show an increasing activity and a spatial migration with time. The calculation of 2 possible scenarios, one M ~ 6.4 and one M ~ 7, shows an important impact on Ulaanbaatar, with a minimum intensity of VIII and IX for M=6.4 and X for M=7
Kilgore, Wayne Walter. "Seismic and Geodetic Investigation of the 1996-1998 Earthquake Swarm at Strandline Lake, Alaska." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1681.
Повний текст джерелаRößler, Dirk, Frank Krüger, Georg Rümpker, and Ivan Psencik. "Tensile source components of swarm events in West Bohemia in 2000 by considering seismic anisotropy." Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2007/1297/.
Повний текст джерелаGeissler, Wolfram H. "Seismic and petrological investigations of the lithosphere in the Swarm-Earthquake and CO2 degassing region Vogtland, NW-Bohemia." Potsdam : Geoforschungszentrum, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975153234.
Повний текст джерелаAden-Antoniów, Florent. "Etude des propriétés mécaniques et de la déformation transitoire dans les zones de subduction à partir de l'analyse de l'activité sismique, le cas du Chili." Thesis, Sorbonne Paris Cité, 2019. https://theses.md.univ-paris-diderot.fr/ADEN_Florent_2_complete_20190111_2.pdf.
Повний текст джерелаThe subduction zones are the most seismically active places in the world and are also the seat of megathrust-earthquakes such as the one that stroke Chile in 1960 with a magnitude estimated at 9.5. The last major ruptures in Chile have revealed complex seismic-aseismic interactions. In order to study these interactions, we investigated on at two seismic crises: the seismic swarm of April 2017; the preparatory phase of the Iquique earthquake (M w 8.1) from April 1 st , 2014. The seismic swarm took place near the city of Valparaiso in an area known to have experienced mega-earthquakes in the past: in 1730 and in 1906. In order to study the dynamics of this swarm we have built a rich catalog of more than 2000 earthquakes composing the sequence. An intense seismic activity began on April 22 nd , two days before the main earthquake of the sequence M w 6.9 and was accompanied by a gradual slip along the interface that we observed both in the GPS data and using repeating-earthquakes. Our analysis suggest that the swarm was driven by aseismic slip. The second study concerns an earthquake of mag-nitude 8.2 which occurred on April 1 st 2014 near the city of Iquique and broke one-third of the seismic gap in northern Chile. This earthquake was preceded by a sequence of precursor seismic swarms that appeared to have been accompanied by stable slip in the subduction interface as well. By building a more complete earthquake catalog, we were able to thoroughly analyze the preparation of the Iquique earthquake. We show, following a statistical approach, the occurrence of a large-scale seismic quiescence in the region of the mainshock. We link this quiescence to a downdip transient-slip potentially related to fluid channeling along the subduction interface
Geissler, Wolfram H. [Verfasser]. "Seismic and petrological investigations of the lithosphere in the Swarm-Earthquake and CO2 degassing region Vogtland, NW-Bohemia / Geoforschungszentrum Potsdam in der Helmholtz-Gemeinschaft. Wolfram H. Geissler." Potsdam : Geoforschungszentrum, 2005. http://d-nb.info/975153234/34.
Повний текст джерелаGeissler, Wolfram H. "Seismic and petrological investigations of the lithosphere in the swarm earthquake and CO2 degassing region Vogtland, NW Bohemia Seismische und petrologische Untersuchungen der Lithosphäre in der Schwarmbeben- und CO2-Entgasungs-Region Vogtland, NW Böhmen /." [S.l. : s.n.], 2004. http://www.diss.fu-berlin.de/2005/73/index.html.
Повний текст джерелаDuverger, Clara. "Sismicité, couplages sismique-asismiques et processus transitoires de déformation dans un système de failles actives : le rift de Corinthe, Grèce." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC252/document.
Повний текст джерелаThe western part of the Corinth Rift in Greece is opening at about 15 mm per year, generating one of the highest deformation rates in the world, some destructive earthquakes of magnitude M>6 per decade, and high microseismic activity irregular in space and time. In order to better understand the mechanisms related to this crustal deformation and to specify the major active structures, this research work makes use of the seismological database of the Corinth Rift Laboratory from 2000 to 2015 by finely analyzing microearthquakes and their spatio-temporal evolution. The global relocation of the seismic sources and their classification into multiplets enable to refine the geometry of the faults and to identify different mechanical behaviors. The western zone, in the middle of the gulf, is affected by fluctuations of fluid pore pressures in a geological layer, resulting in microseismic swarm migrations at a velocity of about 50 m per day. The deep multiplets of the central part, near the northern coast, are persistent and appear to be triggered by episodes of slow aseismic slip along an immature detachment, which can reach the ductile crust. The low percentage of dynamic triggering by passing seismic waves suggests that the overall state of the fault system is not at the critical breaking point. The magnitude of earthquakes is correlated with the initial impulsiveness of the rupture. These results specify the dynamics of the rift deformation, the seismic-aseismic interactions, and will make possible the improvement of the seismic hazard models of the region
Doubravová, Jana. "Automatické a poloautomatické zpracování seismogramů z lokálních sítí WEBNET a REYKJANET." Doctoral thesis, 2020. http://www.nusl.cz/ntk/nusl-437541.
Повний текст джерелаTung, An-Ching, and 董安晉. "Particle Swarm Optimization for Pattern Detection and Seismic Applications." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/30834450966114442759.
Повний текст джерела國立交通大學
多媒體工程研究所
95
Particle Swarm Optimization (PSO) is adopted to detect parameter pattern (e.g. circle, ellipse, hyperbola and asymptote.) Each particle is represented as parameters of patterns, then swarm of particles search the optimal solution in parameter space. We define mathematical formulas to represent various kinds of parameter patterns, and define the distance from points to patterns. Experiments on simulated image get good detection. The method is also applied to detect the parameters of direct wave (line) and reflected wave pattern (hyperbola) in simulated and real one-shot seismogram, the results can improve seismic interpretation and further seismic data processing.
Jakoubková, Hana. "Zemětřesné roje v různých tektonických prostředích: západní Čechy a jihozápadní Island." Doctoral thesis, 2018. http://www.nusl.cz/ntk/nusl-389824.
Повний текст джерелаProcházková, Pavla. "Metodika zpracování makroseismických dat a její aplikace na západočeský seismický roj 2008." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-297916.
Повний текст джерелаGeissler, Wolfram H. [Verfasser]. "Seismic and petrological investigations of the lithosphere in the swarm earthquake and CO2 degassing region Vogtland, NW Bohemia = Seismische und petrologische Untersuchungen der Lithosphäre in der Schwarmbeben- und CO2-Entgasungs-Region Vogtland, NW Böhmen / vorgelegt von Wolfram H. Geissler." 2004. http://d-nb.info/974417831/34.
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