The Hellenic subduction beneath the Peloponnesus: first results of a microearthquake study

Details The Hellenic subduction beneath the Peloponnesus: first results of a microearthquake study The Hellenic subduction beneath the Peloponnesus: first results of a microearthquake study

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..283h&link_type=abstract

Earth and Planetary Science Letters, Volume 93, Issue 2, p. 283-291.

Physics

22

Scientific paper

A preliminary examination of the 1070 earthquake locations, determined from 6 weeks of recording in 1986 by 46 stations, show that the seismicity is spread over a wide area of the Peloponnesus and the western Hellenic arc and throughout the whole crust. No clear individual faults can be identified from the seismicity, but clusters of activity are observed in some places. Seismicity is concentrated above 40 km and deeper earthquakes were not numerous. Only 28 of the 466 events with uncertainties in depth less than 5 km occurred deeper than 40 km.
Seismicity deeper than 30 km defines a flat zone at a depth between 40 km and 70 km, starting from the trench to about 200 km towards the northeast. Further northeast, the dip of the seismic zone abruptly changes to 45°. Fault plane solutions for the deeper events, generally indicate T-axes plunging northeast, within the subducted slab. Therefore, we interpret the seismicity deeper than 30 km as due to the superposition of two different causes: (1) the steep zone is due to the subduction of the African litospheric plate beneath the Aegean, and (2) the shallow flat zone located between the trench and the Argolide is partly due to the loading of the overriding Aegean plate which is deforming above the African plate.

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