Seismic Hazard Assessment in the Area of Mystras-Sparta,South Peloponnesus,Greece, Based on Local Seismotectonic,Seismic, Geologic Information and on Different Models of Rupture Propagation |
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| Authors: | Papanastassiou Dimitris |
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| Institution: | (1) Institute of Geodynamics, National Observatory of Athens, GR-11810 Athens, Greece |
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| Abstract: | Strong seismic events once again confirm the view that great destructive earthquakes are produced by the reactivation of pre-existing
faults although they have usually remained inactive for many, perhaps thousands of years. It is evident that such active seismogenic
zones, with little or no seismicity, have presumably been ignored in the determination of the region's seismic hazard.
At south Peloponnesus, Greece, is situated at Taygetos mountain. At its eastern front lies a large normal fault system, the
southern segment being the Sparta fault. This area has been characterized by low seismicity for the last 25 centuries. However,
during the 6th and 5th centuries B.C. several destructive earthquakes have been reported. That of 464 B.C., was the most destructive
and devastated the city of Sparta. Detailed morphotectonic observations of this area, suggest that the earthquake of 464 B.C.
could be related to the most recent reactivation of this fault.
The ground accelerations that would be produced by a future activation of the Sparta fault, were calculated, by applying a
method which takes into account information mainly from the seismotectonic parameters of the Sparta fault, the rupture pattern,
the properties of the propagation medium and the local ground conditions. Moreover, these results were compared with those
of other independent studies based mainly on the seismic data of the area. This method estimated greater expected values of
ground acceleration than those computed by the conventional seismic hazard methods. The highest values correspond to the activation
of the Sparta fault either in a unilateral rupture, which would start from the southernmost point of the fault, or in a circular
one. Furthermore, an increase is observed of the order of 50% in the ground acceleration values in unconsolidated soft ground
in relation to the corresponding values of hard ground.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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| Keywords: | active fault seismotectonics rupture pattern seismic hazard assessment Greece |
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