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Attenuation in West Bohemia: Evidence of High Attenuation in the Nový Kostel Focal Zone and Temporal Change Consistent with CO2 Degassing
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SYSNO ASEP 0502453 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Attenuation in West Bohemia: Evidence of High Attenuation in the Nový Kostel Focal Zone and Temporal Change Consistent with CO2 Degassing Author(s) Wcislo, Milosz (USMH-B) RID, ORCID
Eisner, Leo (USMH-B) RID
Málek, Jiří (USMH-B) RID, ORCID, SAI
Fischer, T. (CZ)
Vlček, Josef (USMH-B) ORCID, RID
Kletetschka, G. (CZ)Source Title Bulletin of the Seismological Society of America. - : Seismological Society of America - ISSN 0037-1106
Roč. 108, č. 1 (2018), s. 450-458Number of pages 9 s. Publication form Print - P Language eng - English Country US - United States Keywords attenuation ; body waves ; degassing ; earthquake swarm ; Novy Kostel focal zone. Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Geology R&D Projects GAP210/12/2336 GA ČR - Czech Science Foundation (CSF) Institutional support USMH-B - RVO:67985891 UT WOS 000429114900035 EID SCOPUS 85042075059 DOI 10.1785/0120170168 Annotation We used the 2008 West Bohemia (WB) swarm earthquakes to characterize the seismic attenuation in the region. We found effective attenuation factors Q(P) ranging between 150 and 175 and Q(S) between 125 and 165 for most of the stations. We developed an innovative differential attenuation measurement method that shows significantly lower values in the source region of Q(P) similar to 120 and Q(S) similar to 80, consistent with a saturated and fractured rock mass in the source region. Furthermore, stations placed west of the main fault system show a statistically significant temporal decrease in the effective attenuation coefficient. The effective attenuation coefficient is the lowest for the SKC station, the closest station to the mofettes with a high flow of CO2. The observations of the temporal changes are consistent with CO2 flow and fluids. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2019
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