Geodynamic pattern of the West Bohemia region based on permanent GPS measurements |
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| Authors: | Vladimir Schenk Zdeňka Schenkova Zuzana Jechumtálová |
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| Institution: | (1) Centre for Earth Dynamics Research, Institute of Rock Structure and Mechanics, Acad. Sci. Czech Republic, V Holešovičkách 41, 182 09 Praha 8, Czech Republic;(2) Institute of Geophysics, Acad. Sci. Czech Republic, Boční II/1401, 141 31 Praha 4, Czech Republic |
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| Abstract: | In West Bohemia in the period of 2003–2005 five permanent GPS stations were established to detect local movement trends. Their
mutual position changes were determined from time series of GPS observations and were associated with seismic, gravity, and
geo-scientific data related to the geodynamics of the West Bohemian region. Knowledge of local physical processes based on
spatial and time earthquake occurrences, focal mechanisms of main events, stress and strain fields set up a tool for recent
seismotectonic analyses. The permanent GPS measurements bring independent effective phenomenon, direct monitoring of site
movements. The movements detected by our GPS stations evidenced WSW-ENE extension with subsiding trends in the western part
of the Cheb Basin and the Smrčiny Mts. Besides, there were monitored dextral movements along the Mariánské Lázně tectonic
fault zone (MLF). A comparison of results with previous data formed a presumption that an antithetic stress pattern has to
exist inside the inner part of the MLF tectonic zone. This antithetic stress can explain the coexistence of dextral and sinistral
movements on individual tectonic elements in the West Bohemian area. |
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| Keywords: | GPS data horizontal and vertical velocities West Bohemia earthquake swarm area |
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