Seismic coupling and structure of the Hellenic subduction zone in the Ionian Islands region

Details Seismic coupling and structure of the Hellenic subduction zone in the Ionian Islands region Seismic coupling and structure of the Hellenic subduction zone in the Ionian Islands region

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.200..243l&link_type=abstract

Earth and Planetary Science Letters, Volume 200, Issue 3-4, p. 243-253.

Computer Science

5

Scientific paper

The western Hellenic arc has been commonly considered as a largely aseismic subduction zone, from the comparison of a small rate of shortening derived from the seismic moment release, with a large rate of convergence inferred from geology. Complete seismic coupling would instead be expected from models that consider a control by plate tectonic forces, because of the trenchward velocity of the Hellenic-Aegean upper plate now confirmed with GPS measurements. In the region of the Ionian Islands, a subduction interplate boundary has been recently imaged and its seismogenic downdip width suggested to be moderate, from reflection seismic profiling and local earthquake tomography. In the appropriate model for such an earthquake source region, which considers a single interplate fault and takes into account these features, the moderate seismic moment release is found consistent with complete seismic coupling of this subduction. The shallow downdip limit of the seismogenic zone can be interpreted as due to the interplate boundary being overlain there by the ductile deeper crust of the orogenically thickened Hellenides.

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