Focal Mechanisms of West Bohemia, Central Europe, Earthquakes-End of May 2014: Evidence of Volume Changes

0548760 - ÚSMH 2022 RIV US eng J - Journal Article
Křížová, Dana - Málek, Jiří
Focal Mechanisms of West Bohemia, Central Europe, Earthquakes-End of May 2014: Evidence of Volume Changes.
Seismological Research Letters. Roč. 92, č. 6 (2021), s. 3398-3415. ISSN 0895-0695. E-ISSN 1938-2057
R&D Projects: GA ČR(CZ) GA18-05053S
Institutional support: RVO:67985891
Keywords : swarms * fluids * inversion
OECD category: Volcanology
Impact factor: 4.288, year: 2021
Method of publishing: Limited access
https://pubs.geoscienceworld.org/ssa/srl/article-abstract/92/6/3398/606051/Focal-Mechanisms-of-West-Bohemia-Central-Europe?redirectedFrom=fulltext

West Bohemia is a region with a lot of mineral springs and gas outflows, which seems to be related to the remains of Quaternary volcanism in Central Europe. Earthquake swarms in shallow depths (less than 15 km) are very frequent there. We focused on the strongest earthquake over the past 30 yr (31 May, 2014 M-w similar to 3.8) and on two smaller ones (M-w similar to 2.9 and 2.5) from the same day. Seismograms from local and regional seismic stations were used to calculate the full and deviatoric moment tensors using low-frequency full-waveform inversion. The studied events have similar source mechanisms. The aforementioned earthquake sequence was selected to observe the isotropic part (negative value = implosion) of full moment tensors. It could relate to the motion and phase transition of fluids, especially water, and CO2. The main goal of this study is to contribute to clarification of the nature of earthquake swarms in the western edge of the Bohemian Massif. Negative value of the isotropic part of full moment tensor could be related to the closing of cracks and fissures during a rupture process.
Permanent Link: http://hdl.handle.net/11104/0324886