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New Velocity Structure of the NovyKostel Earthquake-Swarm Region, West Bohemia, Determined by the Isometric Inversion
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SYSNO ASEP 0570947 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title New Velocity Structure of the NovyKostel Earthquake-Swarm Region, West Bohemia, Determined by the Isometric Inversion Author(s) Málek, Jiří (USMH-B) RID, ORCID, SAI
Brokešová, J. (CZ)
Novotný, O. (CZ)Number of authors 3 Source Title Pure and Applied Geophysics. - : Springer - ISSN 0033-4553
Roč. 180, č. 6 (2023), s. 2111-2134Number of pages 24 s. Publication form Print - P Language eng - English Country CH - Switzerland Keywords Isometric inversion ; West Bohemia ; Vogtland ; Earthquake swarm ; Station corrections ; Upper crust Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Geology R&D Projects LTAUSA19083 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support USMH-B - RVO:67985891 UT WOS 000957168800001 EID SCOPUS 85150491126 DOI 10.1007/s00024-023-03250-w Annotation The intraplate West Bohemia region is characterized by relatively frequent earthquake swarms mostly concentrated in the vicinity of the NovyKostel village. Records of selected microearthquakes of the 2008 seismic swarm from a small circular area around NovyKostel with a radius of 11 km are processed with focus on availability of precise onset readings from all the selected events at all the selected stations. These data were used in the joint hypocenter-velocity inversion, employing the so-called isometric method which is especially efficient for this task. The results are two new one-dimensional velocity models, the constrained (smoother) and the unconstrained one, of the upper crust down to the depth of 11 km, and absolute locations of the selected earthquakes in the new constrained model. The foci delineate two segments of a steeply dipping fault zone. Time residuals at each of the stations display a remarkable azimuthal dependence, for both P and S waves, caused by anisotropy. No systematic dependence on epicentral distance was found even for stations outside the target area, which means that the new 1D models seem to be reasonable approximations of the real structure in the whole, much larger, West Bohemia region. No time dependence indicating possible changes of vP, vS and their ratio during the swarm was observed. A set of P-and S-wave station corrections that should be used to correct onset times in order to reach precise absolute locations was derived as an integral part of the new models. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2024 Electronic address https://doi.org/10.1007/s00024-023-03250-w
Number of the records: 1