Visualization of the fault slip connected with the West Bohemia earthquake swarms

0363897 - GFÚ 2012 RIV CZ eng J - Journal Article
Kolář, Petr - Růžek, Bohuslav - Boušková, Alena - Horálek, Josef
Visualization of the fault slip connected with the West Bohemia earthquake swarms.
Acta geodynamica et geomaterialia. Roč. 8, č. 2 (2011), s. 169-187. ISSN 1214-9705. E-ISSN 2336-4351
R&D Projects: GA AV ČR(CZ) IAA300120805; GA ČR GAP210/10/1728
Institutional research plan: CEZ:AV0Z30120515
Keywords : West Bohemia earthquake swarm * fault slip * fault dynamics * asperity
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 0.530, year: 2011

The West Bohemia earthquake swarm foci are approximated by a circular seismic source model, which radius is assumed to depend only on magnitude of the event. We consider two different models of average slip (i) a constant slip and (ii) a slip exponentially scaled to the magnitude of the event. Based on these assumptions, we stacked the contributions of individual events into representative final fault slip. We processed in such a way four significant swarms recorded during the last three decades in 1986, 1997, 2000 and 2008. Constant slip model indicates final slip was composed of 2 or 3 principal asperities located on one or two different planes. On the contrary, scaled slip model indicates that one big asperity prevails. It is not possible yet to select the preferred slip model. Analysis of the temporal activity of all swarms generally shows three principal phases: starting phase, main phase and fading phase; the upwards trend of activity spreading was observed.
Permanent Link: http://hdl.handle.net/11104/0199516