Motion on the Kaparelli fault (Greece) prior to the 1981 earthquake sequence determined from 36Cl cosmogenic dating |
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| Authors: | L Benedetti R Finkel G King R Armijo D Papanastassiou F J Ryerson F Flerit D Farber G Stavrakakis |
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| Institution: | Lawrence Livermore National Laboratory –Institute of Geophysics and Planetary Physics, L-202, 7000 east av., CA 94550 Livermore, USA;;Laboratoire de Tectonique, Institut de Physique du Globe de Paris, UMR 7578, 4 place Jussieu, 75252 Paris Cedex 05, France;;Institute of Geodynamics, National Observatory of Athens, PO Box 20048, Gr-118 10, Athens, Greece |
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| Abstract: | ABSTRACT In February and March 1981, three successive destructive earthquakes occurred at the eastern end of the Gulf of Corinth. The third shock (March, 4, Ms ≈ 6.4) ruptured the Kaparelli fault. About 40 cm of a limestone fault scarp was exhumed by the earthquake. Each major prehistoric earthquake has added new surface to this cumulative scarp exposing fresh material to cosmic-ray bombardment. Using 36Cl cosmic ray exposure dating we have obtained the continuous exposure history for this 4–5-m-high limestone surface at two sites about 50 m apart. The results suggest that the Kaparelli fault has ruptured three times prior to 1981 at 20 ± 3 ka, 14.5 ± 0.5 ka and 10.5 ± 0.5 ka with slip amplitudes between 0.6 m and 2.1 m. The Kaparelli fault appears to have been inactive for 10 thousand years prior to the 1981 event. |
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