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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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Shear-tensile crack as a tool for reliable estimates of the non-double-couple mechanism: West Bohemia-Vogtland earthquake 1997 swarm Tvůrce(i) Šílený, Jan (GFU-E) ORCID, RID
Horálek, Josef (GFU-E) ORCID, RIDZdroj.dok. Physics and Chemistry of the Earth. - : Elsevier - ISSN 1474-7065
Roč. 95, October (2016), s. 113-124Poč.str. 12 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova earthquake mechanism ; moment tensor ; shear-tensile crack ; confidence regions Vědní obor RIV DC - Seismologie, vulkanologie a struktura Země CEP GAP210/12/2235 GA ČR - Grantová agentura ČR GA16-03950S GA ČR - Grantová agentura ČR Institucionální podpora GFU-E - RVO:67985530 UT WOS 000388476900010 EID SCOPUS 84979655832 DOI 10.1016/j.pce.2016.06.007 Anotace 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 Pracoviště Geofyzikální ústav Kontakt Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Rok sběru 2017
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