Time Variation of Parameters Related to the Accelerating Preshock Crustal Deformation in the Aegean Area |
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Authors: | G F Karakaisis A S Savvaidis C B Papazachos |
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Institution: | Geophysical Laboratory, School of Geology, Univ. of Thessaloniki, Greece. E-mail: karakais@geo.auth.gr, GR
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Abstract: | — The time variation of two parameters related to accelerating seismic deformation before strong earthquakes in the Aegean area is examined. The first is the b parameter of the Gutenberg-Richter relation and the second is the curvature parameter C, which is a measure of deviation of the accelerating preshock deformation from a linear time variation of this deformation. Following two different procedures, it was found that the b value exhibits a decreasing trend prior to the oncoming earthquake, in agreement with the results of laboratory experiments and other independent observations. C values also show a decreasing trend before main shocks. These results indicate that such time variations of these parameters can be considered as precursory phenomena of ensuing strong earthquakes. |
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