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From earthquake swarm to a mainshock-aftershocks: the 2018 activity in West Bohemia/Vogtland
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SYSNO ASEP 0536049 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title From earthquake swarm to a mainshock-aftershocks: the 2018 activity in West Bohemia/Vogtland Author(s) Bachura, Martin (GFU-E) ORCID
Fischer, T. (CZ)
Doubravová, Jana (GFU-E) ORCID, RID
Horálek, Josef (GFU-E) ORCID, RIDSource Title Geophysical Journal International - ISSN 0956-540X
Roč. 224, č. 3 (2021), s. 1835-1848Number of pages 14 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords seismicity and tectonics ; earthquake source observations ; statistical seismology Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Volcanology R&D Projects GA18-05053S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support GFU-E - RVO:67985530 UT WOS 000606573600022 EID SCOPUS 85099632278 DOI 10.1093/gji/ggaa523 Annotation In earthquake swarms, seismic energy is released gradually by many earthquakes without a dominant event, which offers detailed insight into the processes on activated faults. The swarm of May 2018 that occurred in West Bohemia/Vogtland region included more than 4000 earthquakes with ML =(0.5, 3.8&x3009 x232A, and its character showed significant changes during the two weeks duration: what started as a pure earthquake swarm ended as a typical main shock-aftershock sequence. Based on precise double-difference relocations, four fault segments differing in strikes and dips were identified with similar dimensions. First, two segments of typical earthquake swarm character took place, and at the end a fault segment hosting a main shock-aftershock sequence was activated. The differences were observable in the earthquakes spatio-temporal evolutions (systematic versus disordered migration of the hypocentres), b-values (>1.3 for the swarm, <1 for the main shock-aftershocks), or the smoothness of seismic moment spatial distribution along the fault plane. Our findings can be interpreted by local variations of fault rheology, differential stress and/or smoothness of the faults surface, possibly related to the crustal fluids circulating along the fault plane and their interplay with the seismic cycle. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2022 Electronic address https://academic.oup.com/gji/article/224/3/1835/5955445
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