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Homogeneous Velocity Models of The West Bohemian Swarm Region Obtained By Grid Search
Authors:Janský  Jaromír  Horálek  Josef  Málek  Jiří  Boušková  Alena
Institution:(1) Department of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic;(2) Geophysical Institute, Academy of Sciences of the Czech Republic, Prague, Czech Republic;(3) Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, Czech Republic;(4) Geophysical Institute, Academy of Sciences of the Czech Republic, Prague, Czech Republic
Abstract:West Bohemian earthquake swarms are used to determine the parameters of simple homogeneous velocity models of the individual subregions of the given area, based on a group of earthquakes that occurred in these subregions. The grid search method is used for location. Models yielding the minimum sum of squares of the travel-time residua in locating the whole group of earthquakes in the given subregion are considered suitable. Relocation obtained by grid search is compared with that obtained by the FASTHYPO method. The computations indicate that the subregions under consideration can be, from the point of view of earthquake location, sufficiently represented by homogeneous models, but the models differ for the data from different subregions. The velocities of these models are given. The models under consideration are compared with some of the previously published 1-D models of the broader region of Western Bohemia.
Keywords:West Bohemia  earthquake swarms  location  grid search  homogeneous velocity models
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