NDLI: The 2011 West Bohemia (Central Europe) earthquake swarm compared with the previous swarms of 2000 and 2008

Content Provider	Springer Nature Link
Author	Čermáková, Hana Horálek, Josef
Copyright Year	2015
Abstract	This paper presents the basic characteristics of the 2011 West Bohemia/Vogtland earthquake swarm and compares it with the swarms in 2000 and 2008. All these swarms occurred in the Nový Kostel focal zone. Up to 25,000 M $_{ L }$≤3.7 events with depths between 6 and 10 km were detected in the 2011 swarm. Utilizing WEBNET data, we analysed the cumulative seismic moment, magnitude-frequency and interevent time distributions, space-time distribution of foci and typical focal mechanisms. For this purpose, we improved the formula for estimating the local magnitude M $_{ L }$ used by WEBNET. The 2011 swarm exhibited much higher rapidity than the swarms of 2000 and 2008. The magnitude-frequency distributions of all the three swarms are similar, having the b-value close to 1.0. However, the events of higher magnitudes, roughly M $_{ L }$∼3.0+, depart markedly from the general trend of the weaker events. The probability density functions of the interevent times of all the swarms comply with power law ∝T $^{−1.4}$, which points to Omori law-like mainshock-aftershock activity. All swarms exhibit a pronounced focal migration; however, no regularity was found. The spatial distribution of the 2011 foci indicates two active fault segments which differ from the segment triggered in the swarms of 2000 and 2008. Furthermore, we analysed the spatial distribution of the mini-swarm of 2013 and found that it complements the swarm of 2011. The prevailing focal mechanisms in the 2011 swarm are of both oblique-normal and oblique-thrust types and correspond closely to the geometry of the activated fault segments. Our analyses indicate that the Nový Kostel area is more complex than was believed to be.
Starting Page	899
Ending Page	913
Page Count	15
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	19
Issue Number	4
e-ISSN	1573157X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-07-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	West Bohemia/Vogtland Local seismicity Earthquake swarm Relative locations Focal mechanism estimation Geophysics/Geodesy Structural Geology Hydrogeology Geotechnical Engineering & Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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