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Detection of high-frequency tensile vibrations of a fault during shear rupturing: observations from the 2008 West Bohemia swarm
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SYSNO ASEP 0363813 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Detection of high-frequency tensile vibrations of a fault during shear rupturing: observations from the 2008 West Bohemia swarm Author(s) Vavryčuk, Václav (GFU-E) ORCID, RID Source Title Geophysical Journal International - ISSN 0956-540X
Roč. 186, č. 3 (2011), s. 1404-1414Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords earthquake dynamics ; earthquake source observations ; body waves ; dynamics and mechanics of faulting 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 000293998000036 DOI 10.1111/j.1365-246X.2011.05122.x Annotation The analysis of 12 earthquakes of magnitudes between 1.7 and 3.7 that occurred in 2008 in West Bohemia, Czech Republic reveals that shear rupturing along a fault is accompanied by weak tensile vibrations of the fault. The vibrations are of a narrow frequency band with frequencies distinctly higher than those of shear rupturing. The tensile vibrations decay slowly in time and often resemble resonant waves. They complicate the radiated P waveforms and the P-wave radiation pattern. The tensile vibrations can be observed in waveforms in directions near the nodal lines where the dominance of shear-faulting radiation is lost. The tensile vibrations are probably generated by opening of the fault during shear rupturing or by creating a wing tensile crack at the tip of the fault when shear fracturing stops. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2012
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