The West Bohemian 2008-earthquake swarm: When, where, what size and data

Horálek, Josef; Fischer, Tomáš; Boušková, Alena; Michálek, Jan; Hrubcová, Pavla

doi:10.1007/s11200-009-0024-8

Cited by 24 publications

(20 citation statements)

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“…The 2008 and S-wave readings using an absolute locating procedure included in the SeisBase package (Fischer and Hampl, 1997 During this swarm, nine M L ≥3.0 earthquakes (see Table 2) and about 100 M L ≥2.0 earthquakes occurred; six largest events with magnitudes of M L ≥3.5 were observed macroseismically in a broader area of West Bohemia (a brief overview of macroseismic observations was given in Horálek et al, 2009). The maximum observed ground motions at the WEBNET stations there were 9.5E-3 m/s for ground velocity, 2.6E-4 m for displacement and 0.65 m/s 2 for acceleration, see Table 3.…”

Section: Basic Characteristics Of the 2008 Swarm Comparison With Prementioning

confidence: 99%

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The 2008 West Bohemia earthquake swarm in the light of the WEBNET network

et al. 2010

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International audienceA swarm of earthquakes of magnitudes up to = 3.8 stroke the region of West Bohemia/Vogtland (border area between Czechia and Germany) in October 2008. It occurred in the Nový Kostel focal zone, where also all recent earthquake swarms (1985/1986, 1997, and 2000) took place, and was striking by a fast sequence of macroseismically observed earthquakes. We present the basic characteristics of this swarm based on the observations of a local network WEBNET (West Bohemia seismic network), which has been operated in the epicentral area, on the Czech territory. The swarm was recorded by 13 to 23 permanent and mobile WEBNET stations surrounding the swarm epicenters. In addition, a part of the swarm was also recorded by strong-motion accelerometers, which represent the first true accelerograms of the swarm earthquakes in the region. The peak ground acceleration reached 0.65 m/s. A comparison with previous earthquake swarms indicates that the total seismic moments released during the 1985/1986 and 2008 swarms are similar, of about 4E16 Nm, and that they represent the two largest swarms that occurred in the West Bohemia/ Vogtland region since the = 5.0 swarm of 1908. Characteristic features of the 2008 swarm are its short duration (4 weeks) and rapidity and, consequently, the fastest seismic moment release compared to previous swarms. Up to 25,000 events in the magnitude range of 0.5 < < 3.8 were detected using an automatic picker. A total of nine swarm phases can be distinguished in the swarm, five of them exceeding the magnitude level of 2.5. The magnitude-frequency distribution of the complete 2008 swarm activity shows a value close to 1. The swarm hypocenters fall precisely on the same fault portion of the Nový Kostel focal zone that was activated by the 2000 swarm ( ≤ 3.2) in a depth interval from 6 to 11 km and also by the 1985/1986 swarm ( ≤ 4.6). The steeply dipping fault planes of the 2000 and 2008 swarms seem to be identical considering the location error of about 100 m. Furthermore, focal mechanisms of the 2008 swarm are identical with those of the 2000 swarm, both matching an average strike of 170° and dip of 80° of the activated fault segment. An overall upward migration of activity is observed with first events at the bottom and last events at the top of the of the activated fault patch. Similarities in the activated fault area and in the seismic moments released during the three largest recent swarms enable to estimate the seismic potential of the focal zone. If the whole segment of the fault plane was activated simultaneously, it would represent an earthquake of ~5. This is in good agreement with the estimates of the maximum magnitudes of earthquakes that occurred in the West Bohemia/Vogtland region in the past

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Section: Basic Characteristics Of the 2008 Swarm Comparison With Prementioning

confidence: 99%

“…Brief information on the 2008 swarm was given by Horálek et al (2009). The aim of our paper is to provide basic characteristics of the 2008 swarm based on the WEBNET observations and compare them with previous swarms in 1985 /86, 1997 and 2000.…”

Section: Introductionmentioning

confidence: 99%

The 2008 West Bohemia earthquake swarm in the light of the WEBNET network

et al. 2010

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“…Nine earthquakes reached local magnitude 3.0 or more, about 110 earthquakes reached local magnitude 2.02.9. Basic information about the 2008 swarm activity was presented in Horálek et al (2009), a detailed study made by the WEBNET group is under preparation. Preliminary results of data evaluation are presented on the WEBNET web pages, final catalogue of local events will be available after completion.…”

Section: Seismic Activity In 2008mentioning

confidence: 99%

“…Windows, doors and dishes rattled, some objects or furniture moved or fell down. Acoustic effects like vibrations, explosions, rumbling and thundering were reported (Horálek et al, 2009). The evaluation of obtained macroseismic questionnaires has not been finished yet but maximum intensities greater than 5 are not expected.…”

Section: Seismic Activity In 2008mentioning

confidence: 99%

Seismic activity in the Czech Republic in 2008

Zedník

Pazdírková

2010

Stud Geophys Geod

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“…Subsequent observations demonstrate that natural seismicity still exists in the area mentioned above (Špaček et al 2006), though it is less intensive compared e.g. with seismic swarms in the NW Bohemia Horálek, 2003 andHorálek et al, 2009). Study of deep geological structure and tectonic regime is useful not only for mitigation of mining risk, but also for solving more general geological and tectonic problems of the region comprising the contact zone Stud.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional Crustal model of the Moravo-Silesian region obtained by seismic tomography

2011

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All recent available data sets containing traveltimes of Pg and Sg phases for the Moravo-Silesian region were collected. These data come from several experiments designed mostly in 2D (in-line) configurations. Simultaneous processing of all data is possible only considering the true 3D measurement geometry. The goal of this work is to establish the representative 3D seismic model by means of seismic tomography. The resulting minimum-structure model is presented in a simple and easy to use form on the Internet. The amount of processed data is relatively low but repeating the computations with new experimental data included would be very easy. Important material related to this paper is placed on web pages.

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The West Bohemian 2008-earthquake swarm: When, where, what size and data

Cited by 24 publications

References 5 publications

The 2008 West Bohemia earthquake swarm in the light of the WEBNET network

The 2008 West Bohemia earthquake swarm in the light of the WEBNET network

Seismic activity in the Czech Republic in 2008

Three-dimensional Crustal model of the Moravo-Silesian region obtained by seismic tomography

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