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Principal earthquakes: Theory and observations from the 2008 West Bohemia swarm
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SYSNO ASEP 0363814 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Principal earthquakes: Theory and observations from the 2008 West Bohemia swarm Author(s) Vavryčuk, Václav (GFU-E) ORCID, RID Source Title Earth and Planetary Science Letters. - : Elsevier - ISSN 0012-821X
Roč. 305, č. 3-4 (2011), s. 290-296Number of pages 7 s. Language eng - English Country NL - Netherlands Keywords earthquake ; failure criterion ; fault friction ; focal mechanism ; tectonic stress Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects IAA300120801 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30120515 - GFU-E (2005-2011) UT WOS 000291280000004 DOI 10.1016/j.epsl.2011.03.002 Annotation Earthquakes that occur on optimally oriented fault planes with respect to the tectonic stress regime display two distinct focal mechanisms and are fundamental characteristics of each seismically active region. These earthquakes, which we term 'principal', need not coincide with the strongest earthquakes or need not occur along the major active faults in the region. Stability analysis of diversely oriented fault planes under a given stress reveals that the focal mechanisms connected with unstable fault planes should not be very distinct from those of the principal earthquakes. The P/T axes form clusters with a typical two-wing or 'butterfly' pattern. This pattern is particularly visible when constructing the failure curves defined as a projection of the Mohr-Coulomb failure criterion in the Mohr's diagram onto the focal sphere. The position, shape and size of the failure curves depend on the stress orientation, shape ratio, friction and on the size of the instability area in the Mohr's diagram. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2012
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