Seismic regime of the west Bohemian earthquake swarm region: Preliminary results

Horálek, Josef; Hampl, F.; Boušková, Alena; Fischer, Tomáš

doi:10.1007/bf02300767

Cited by 40 publications

(19 citation statements)

References 2 publications

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“…The last swarm quake of January 1997, for example, generated 1600 events with local magnitudes B 1, 94 events with magnitude \ 1 and 8 events with magnitude 2 to 3. The foci are clustered in six main epicentral zones (HORALEK et al, 1996). Clusters 1 to 4 are shown in Figure 1, clusters 5 and 6 are outside the region of interest.…”

Section: Precursory Phenomena At Bad Brambachmentioning

confidence: 99%

“…The Mariánské Lázné fault zone (MLFZ, NW-SE) and the Eger rift (ENE-WSW) are the main tectonic elements. Areas 1 -4 are clusters of epicenters (HORALEK et al, 1996) with a radon concentration of about 25 kBq/l. From tritium measurements, the content of old meteoric water in the ''Radon-Quelle'' is 80% (RICHTER, 1994).…”

Section: Precursory Phenomena At Bad Brambachmentioning

confidence: 99%

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Slug Flow—A Possible Explanation for Hydrogeochemical Earthquake Precursors at Bad Brambach, Germany

Heinicke¹,

Koch²

2000

Pure appl. geophys.

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Extensive hydrogeological, geochemical, radiometric and hydro-isotope investigations in the Vogtland region, Germany, since 1989 suggest a fluid connection between a special epicentral area (focal depth: 3-15 km; M L B 5) and a mineral spring at Bad Brambach. Twenty-six hydrogeochemical anomalies are related to earthquakes/swarmquakes of that epicentral area near Novy Kostel (CZ) during the last 9 years. The anomalies were originated by a slug-flow process in the fluid-filled fracture system near the surface. The gas component of the observed fluid (99 vol. % CO 2 ) is of upper mantle/crustal origin. The fluid transport pathway to the surface is the seismically active Mariánské Lázné fault zone. The interpretation suggests an influence of the fluid system due to earthquake preparation processes.

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Section: Precursory Phenomena At Bad Brambachmentioning

confidence: 99%

Section: Precursory Phenomena At Bad Brambachmentioning

confidence: 99%

Slug Flow—A Possible Explanation for Hydrogeochemical Earthquake Precursors at Bad Brambach, Germany

Heinicke¹,

Koch²

2000

Pure appl. geophys.

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“…The geology has been compiled from (DUDEK, 1987), seismic foci (black dots) from HORÁ LEK et al (1996). Arrows indicate sample location.…”

Section: Figurementioning

confidence: 99%

“…For the region under study, this value corresponds to the mean lithostatic pressure at a depth of about 15 km, which is the maximum focal depth observed in the region (HORÁ LEK et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Elastic Parameters of West Bohemian Granites under Hydrostatic Pressure

Pros¹,

Lokajı́ček²,

Přikryl³

et al. 1998

Pure and Applied Geophysics

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The West Bohemian seismoactive region is situated near the contact of the Moldanubian, Bohemian and Saxothuringian units in which a large volume is occupied by granitoid massifs. The spatial distribution of P-wave velocities and the rock fabric of five representative samples from these massifs were studied. The P-wave velocities were measured on spherical samples in 132 independent directions under hydrostatic pressure up to 400 MPa, using the pulse-transmission method. The pressure of 400 MPa corresponds to a depth of about 15 km in the area under study. The changes of P-wave velocity were correlated with the preferred orientations of the main rock fabric elements, i.e., rock forming minerals and microcracks. The values of the P-wave velocity from laboratory measurements on granite samples fit the velocity model used by seismologists in the West Bohemian seismoactive region.

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“…The most recent expressions of the geodynamic activity are represented by the widespread CO 2 emanations and Quaternary volcanism (Bräuer et al, 2005a,b). It is also a region of a frequent occurrence of seismic activity manifested by the intraplate earthquake swarms with magnitudes up to 4.6 (Horálek et al, 1996(Horálek et al, , 2000Fischer and Michálek, 2008). Fischer and Horálek (2003) locate the hypocenters of these swarms to the upper and middle crust down to about 20 km depth with the majority between 5 and 15 km.…”

Section: Introductionmentioning

confidence: 98%

The crust-mantle transition and the Moho beneath the Vogtland/West Bohemian region in the light of different seismic methods

Hrubcová

Geissler

2009

Stud Geophys Geod

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The structure of the crust and the crust-mantle boundary in the Vogtland/West Bohemian region have been a target of several seismic measurements for the last 25 years, beginning with the steep-angle reflection seismic studies 9HR), the refraction and wide-angle experiments (GRANU'95, CELEBRATION 2000, SUDETES 2003, and followed by passive seismic studies (receiver functions, teleseismic tomography). The steep-angle reflection studies imaged a highly reflective lower crust (4 to 6 km thick) with the Moho interpreted in a depth between 30 and 32 km and a thinner crust beneath the Eger Rift. The refraction and wide-angle reflection seismic studies (CELEBRATION 2000) revealed strong wide-angle reflections in a depth of 2628 km interpreted as the top of the lower crust. Long coda of these reflections indicates strong reflectivity in the lower crustal layer, a phenomenon frequently observed in the Caledonian and Variscan areas. The receiver function studies detected one strong conversion from the base of the crust interpreted as the Moho discontinuity at a depth between 27 and 37 km (average at about 31 km). The discrepancies in the Moho depth determination could be partly attributed to different background of the methods and their resolution, but could not fully explain them. So that new receivers function modelling was provided. It revealed that, instead of a first-order Moho discontinuity, the observations can be explained with a lower crustal layer or a crust-mantle transition zone with a maximum thickness of 5 km. The consequent synthetic ray-tracing modelling resulted in the model with the top of the lower crust at 28 km, where highly reflective lower crustal layer can obscure the Moho reflection at a depth of 3233 km.K e y w o r d s : Bohemian Massif, Vogtland/West Bohemia, crustal structure, Moho, refraction and wide-angle reflection, receiver function, seismic methods, Eger Rift

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Seismic regime of the west Bohemian earthquake swarm region: Preliminary results

Cited by 40 publications

References 2 publications

Slug Flow—A Possible Explanation for Hydrogeochemical Earthquake Precursors at Bad Brambach, Germany

Slug Flow—A Possible Explanation for Hydrogeochemical Earthquake Precursors at Bad Brambach, Germany

Elastic Parameters of West Bohemian Granites under Hydrostatic Pressure

The crust-mantle transition and the Moho beneath the Vogtland/West Bohemian region in the light of different seismic methods

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