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Shear-tensile crack as a tool for reliable estimates of the non-double-couple mechanism: West Bohemia-Vogtland earthquake 1997 swarm
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SYSNO ASEP 0460507 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Shear-tensile crack as a tool for reliable estimates of the non-double-couple mechanism: West Bohemia-Vogtland earthquake 1997 swarm Author(s) Šílený, Jan (GFU-E) ORCID, RID
Horálek, Josef (GFU-E) ORCID, RIDSource Title Physics and Chemistry of the Earth. - : Elsevier - ISSN 1474-7065
Roč. 95, October (2016), s. 113-124Number of pages 12 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords earthquake mechanism ; moment tensor ; shear-tensile crack ; confidence regions Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects GAP210/12/2235 GA ČR - Czech Science Foundation (CSF) GA16-03950S GA ČR - Czech Science Foundation (CSF) Institutional support GFU-E - RVO:67985530 UT WOS 000388476900010 EID SCOPUS 84979655832 DOI 10.1016/j.pce.2016.06.007 Annotation Shear-tensile crack is a model for an earthquake mechanism that is more constrained than the moment tensor but that can still describe a non-shear focus. As such, the shear-tensile crack model is more robust than the moment tensor model and yields more reliable estimates for the earthquake mechanism. Such an advantage verifies the credibility of the non-double-couple component found for some events of the 1997 West Bohemia-Vogtland earthquake swarm. As expected, in several cases, a significantly resolved non-double-couple component was obtained where the moment tensor approach failed. Additionally, for non-shear sources, the shear-tensile crack model offers optimization of the Poisson number within the focus, concurrently with retrieval of the mechanism. However, results obtained for the joint inversion of the 1997 swarm indicate that resolution is low. A series of synthetic experiments indicated that limited observations during 1997 were not the cause. Rather, hypothetical experiments of both very good and extremely poor network configurations similarly yielded a low resolution for the Poisson number. Applying this method to data for recent swarms is irrelevant because the small non-double-couple components detected within the inversion are spurious and, thus, the events are pure double-couple phenomena Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2017
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