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Empirical Peak Ground-Motion Predictive Relations for Shallow Earthquakes in Greece

Geophysical Laboratory
Aristotle University of Thessaloniki
GR-54124 Thessaloniki, Greece

(A.A.S., C.B.P., E.M.S., V.K.)
Institute of Engineering Seismology and Earthquake Engineering
P.O. Box 53 Foinikas
GR-55102 Thessaloniki, Greece
(B.N.M., N.T., C.P.)
Geodynamic Institute
National Observatory of Athens
P.O. Box 20048
GR-11810 Athens, Greece
(I.K.)

Manuscript received 16 January 2003.

In the present article new predictive relations are proposed for the peak values of the horizontal components of ground acceleration, velocity, and displacement, using 619 strong motion recordings from shallow earthquakes in the broader Aegean area, which are processed using the same procedure in order to obtain a homogeneous strong motion database. The data set is derived from 225 earthquakes, mainly of normal and strike-slip focal mechanisms with magnitudes 4.5 M 7.0 and epicentral distances in the range 1 km R 160 km that have been relocated using an appropriate technique. About 1000 values of peak ground acceleration (PGA), velocity (PGV), and displacement (PGD) from horizontal components were used to derive the empirical predictive relations proposed in this study. A term accounting for the effect of faulting mechanisms in the predictive relations is introduced, and the UBC (1997) site classification is adopted for the quantification of the site effects. The new relations are compared to previous ones proposed for Greece or other regions with comparable seismotectonic environments. The regression analysis showed a noticeable (up to 30%) variance reduction of the proposed relations for predicting PGA, PGV, and PGD values compared to previous ones for the Aegean area, suggesting a significant improvement of predictive relations due to the use of a homogeneous strong motion database and improved earthquake parameter information.

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