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Aftershocks triggered by fluid intrusion: Evidence for the aftershock sequence occurred 2014 in West Bohemia/Vogtland
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SYSNO ASEP 0463859 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Aftershocks triggered by fluid intrusion: Evidence for the aftershock sequence occurred 2014 in West Bohemia/Vogtland Author(s) Hainzl, S. (DE)
Fischer, Tomáš (GFU-E) ORCID, RID
Čermáková, Hana (GFU-E) RID
Bachura, M. (CZ)
Vlček, J. (CZ)Source Title Journal of Geophysical Research-Solid Earth. - : Wiley - ISSN 2169-9313
Roč. 121, č. 4 (2016), s. 2575-2590Number of pages 16 s. Publication form Print - P Language eng - English Country US - United States Keywords pore-pressure diffusion ; 2000 earthquake swarm ; Vogtland/Western Bohemia Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects GAP210/12/2336 GA ČR - Czech Science Foundation (CSF) LM2010008 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support GFU-E - RVO:67985530 UT WOS 000381626700020 EID SCOPUS 84963647496 DOI Annotation The West Bohemia/Vogtland region, central Europe, is well known for its repeating swarm activity. However, the latest activity in 2014, although spatially overlapping with previous swarm activity, consisted of three classical aftershock sequences triggered by M(L)3.5, 4.4, and 3.5 events. To decode the apparent system change from swarm-type to mainshock-aftershock characteristics, we have analyzed the details of the major M(L)4.4 sequence based on focal mechanisms and relocated earthquake data. Our analysis shows that the mainshock occurred with rotated mechanism in a step over region of the fault plane, unfavorably oriented to the regional stress field. Most of its intense aftershock activity occurred in-plane with classical characteristics such as (i) the maximum magnitude of the aftershocks is significantly less than the mainshock magnitude and (ii) the decay can be well fitted by the Omori-Utsu law. However, the absolute number of aftershocks and the fitted Omori-Utsu c and p parameters are much larger than for typical sequences. By means of the epidemic-type aftershock sequence model, we show that an additional aseismic source with an exponentially decaying strength triggered a large fraction of the aftershocks. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2017
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