Acta Geodynamica et Geomaterialia

Title: CLUSTERING OF 2008 WEST BOHEMIAN SEISMIC SWARM MECHANISMS AND ITS POSSIBLE INTERPRETATION
Authors: Kolář Petr and Boušková Alena
DOI: 10.13168/AGG.2018.0001
Journal: Acta Geodynamica et Geomaterialia, Vol. 15, No. 1 (189), Prague 2018
Full Text: PDF file (2.2 MB)
Keywords: West Bohemian earthquake swarm region; source mechanism; slip distribution; finite seismic source model
Abstract: Set of events from West Bohemian 2008 seismic swarm with known source mechanisms is processed. The events or their slips respectively are clustered into two groups: (i) principal events with slip laying in the main fault plane and (ii) complementary events deviating from that plane. From those slips we constructed image of slip distribution (a new way of data/slip presentation) and from slip distribution and variations we hypothesized about foci zone properties. Namely, we propose that western block is more rigid and compact; the eastern block appears to be constituted from several sub blocks which can interact with each other during the swarm course. Our hypothesis is supported by similar image constructed from relative rupture velocities, which we consider as independent data. The proposed structural model agrees with the existence of the different observed types of source mechanisms.