|
|||||
|
|
An estimate of probabilistic seismic hazard for five cities in Greece by using the parametric-historic procedure |
|
| Authors: | Pivi Mntyniemi Theodoros M Tsapanos Andrzej Kijko |
| Institution: | a Institute of Seismology, University of Helsinki, P.O. Box 26, SF-00014, Helsinki, Finland b Geophysical Laboratory, School of Geology, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece c Council for Geoscience, Private Bag X112, Pretoria, 0001, South Africa |
| Abstract: | A probabilistic procedure was applied to assess seismic hazard for the sites of five Greek cities (Athens, Heraklion, Patras, Thessaloniki and Volos) using peak ground acceleration as the hazard parameter. The methodology allows the use of either historical or instrumental data, or a combination of both. It has been developed specifically for the estimation of seismic hazard at a given site and does not require any specification of seismic sources or/and seismic zones. A new relation for the attenuation of peak ground acceleration was employed for the shallow seismicity in Greece. The computations involved the area- and site-specific parts. When assessing magnitude recurrence for the areas surrounding the five cities, the maximum magnitude, mmax, was estimated using a recently derived equation. The site-specific results were expressed as probabilities that a given peak ground acceleration value will be exceeded at least once during a time interval of 1, 50 and 100 years at the sites of the cities. They were based on the maximum peak ground acceleration values computed by assuming the occurrence of the strongest possible earthquake (of magnitude mmax) at a very short distance from the site and using the mean value obtained with the help of the attenuation law. This gave 0.24 g for Athens, 0.53 g for Heraklion (shallow) and 0.39 g Heraklion (intermediate-depth seismicity), 0.30 g for Patras, 0.35 g for Thessaloniki and 0.30 g for Volos. In addition, the probabilities of exceedance of the estimated maximum peak ground acceleration values were calculated for the sites. The standard deviation of the new Greek attenuation law demonstrates the uncertainty and large variation of predicted peak ground acceleration values. |
| Keywords: | Author Keywords: Probabilistic seismic hazard assessment Seismicity of Greece Peak ground acceleration Attenuation law |
| 本文献已被 ScienceDirect 等数据库收录！ | |