ŠPAČEK, Petr, Pavel ZACHERLE, Zdeňka SÝKOROVÁ and Jana PAZDÍRKOVÁ. Microseismic multiplets in the northeastern Bohemian Massif. Zeitschrift für Geologische Wissenschaften. 2011, vol. 39, 5/6, p. 367-386. ISSN 0303-4534.
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Basic information
Original name Microseismic multiplets in the northeastern Bohemian Massif
Authors ŠPAČEK, Petr (203 Czech Republic, guarantor, belonging to the institution), Pavel ZACHERLE (203 Czech Republic, belonging to the institution), Zdeňka SÝKOROVÁ (203 Czech Republic, belonging to the institution) and Jana PAZDÍRKOVÁ (203 Czech Republic, belonging to the institution).
Edition Zeitschrift für Geologische Wissenschaften, 2011, 0303-4534.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10507 Volcanology
Country of publisher Germany
Confidentiality degree is not subject to a state or trade secret
RIV identification code RIV/00216224:14310/11:00056506
Organization unit Faculty of Science
Keywords in English microseismicity; seismic multiplets; correlation; active tectonics; pull-apart; Sudetic Fault System; Bohemian Massif
Tags AKR, rivok
Changed by Changed by: Mgr. Petr Špaček, Ph.D., učo 18763. Changed: 26/3/2012 13:45.
Abstract
We have analysed >1800 records of very weak microearthquakes (-1.9<=ML<=2.2) registered in the NE part of the Bohemian Massif during the years 1998-2008. Cross-correlation analysis showed that 74% of these events are duplets and multiplets or near-multiplets. 191 families of these similar events were distinguished, representing small-volume repeatedly activated focal domains. The families are largely variable in terms of number of events (2-101), overall durations of activity (up to >12 years) and time distributions of the events. The magnitude-distribution of events from individual re-activated foci obeys Gutenberg-Richter law at least in the magnitude range -1.3<=ML&<=1.3. The typical b-values are close to b=1, which also applies for the whole catalogue of events located in the region. In this respect, the investigated region is similar to other presently deformed regions where seismicity is controlled by far-field stresses. Based on the fault geometry, the evolution of sedimentary basin in the most active part of the region, and the spatial co-incidence of the earthquake epicentres with carbonated mineral springs in a rhomb-shaped domain, we suggest a preliminary model explaining the studied region as a transfer zone with releasing geometry (pull-apart mechanism), operating within the system of dextral wrench faults.
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