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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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Aftershocks triggered by fluid intrusion: Evidence for the aftershock sequence occurred 2014 in West Bohemia/Vogtland Tvůrce(i) Hainzl, S. (DE)
Fischer, Tomáš (GFU-E) ORCID, RID
Čermáková, Hana (GFU-E) RID
Bachura, M. (CZ)
Vlček, J. (CZ)Zdroj.dok. Journal of Geophysical Research-Solid Earth. - : Wiley - ISSN 2169-9313
Roč. 121, č. 4 (2016), s. 2575-2590Poč.str. 16 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova pore-pressure diffusion ; 2000 earthquake swarm ; Vogtland/Western Bohemia Vědní obor RIV DC - Seismologie, vulkanologie a struktura Země CEP GAP210/12/2336 GA ČR - Grantová agentura ČR LM2010008 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora GFU-E - RVO:67985530 UT WOS 000381626700020 EID SCOPUS 84963647496 DOI 10.1002/2015JB012582 Anotace 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. Pracoviště Geofyzikální ústav Kontakt Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Rok sběru 2017
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