High-resolution fault image from accurate locations and focal mechanisms of the 2008 swarm earthquakes in West Bohemia, Czech Republic

0394895 - GFÚ 2014 RIV NL eng J - Journal Article
Vavryčuk, Václav - Bouchaala, Fateh - Fischer, Tomáš
High-resolution fault image from accurate locations and focal mechanisms of the 2008 swarm earthquakes in West Bohemia, Czech Republic.
Tectonophysics. Roč. 590, April (2013), s. 189-195. ISSN 0040-1951. E-ISSN 1879-3266
R&D Projects: GA ČR(CZ) GAP210/12/1491; GA MŠMT LM2010008
EU Projects: European Commission(XE) 230669 - AIM
Institutional support: RVO:67985530
Keywords : earthquake location * failure criterion * fault friction * focal mechanism * tectonic stress
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 2.866, year: 2013

We have analyzed 463 micro-earthquakes in the magnitude range from 0.5 to 3.8 that occurred during the 2008 earthquake swarm in West Bohemia, Czech Republic, in order to screen the detailed structure of the focal zone situated at depths between 7 and 11 km. The double-difference location method was applied to records of 22 local seismic stations with an epicentral distance of less than 25 km in order to retrieve highly accurate locations of hypocenters with an accuracy of less than 20 m. The hypocenters are well-clustered and distinctly map the system of activated faults. The fault system has a complex geometry being composed of several fault segments with different orientations. Some of the segments intersect each other. The orientations of the segments coincide well with the focal mechanisms. We have introduced and evaluated the so-called fault instability of the individual fault segments.
Permanent Link: http://hdl.handle.net/11104/0223053