Elastic Parameters of West Bohemian Granites under Hydrostatic Pressure |
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Authors: | Z Pros T Lokají?ek R P?ikryl A ?pi?ák V Vajdová K Klíma |
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Institution: | Geophysical Institute, Academy of Sciences of the Czech Republic, Bo?níII/1401, 141 31 Prague 4, Czech Republic, E-mail: tl@ig.cas.cz, CZ Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic, E-mail: prikryl@mail.natur.cuni.cz, CZ
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Abstract: | —The West Bohemian seismoactive region is situated near the contact of the Moldanu bian, 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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