A double-planed seismic zone in Kamchatka from local and teleseismic data

Details A double-planed seismic zone in Kamchatka from local and teleseismic data A double-planed seismic zone in Kamchatka from local and teleseismic data

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1675g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 16, p. 1675-1678

Physics

9

Earthquakes, P Waves, Peninsulas, Russian Federation, Seismic Waves, Seismology, Sh Waves, Subduction (Geology), Ground Stations, Networks, Plates (Tectonics), Stress Distribution, Tectonics

Scientific paper

The fine structure of a double-planed deep seismic zone is studied over a wide area of the Kamchatka peninsula. This prominent feature of deep seismic zone configuration is ascertained through the analysis of microearthquake hypocenters from the local seismic network of the Institute of Volcanology of Kamchatka (IVK) and 22 focal mechanism solutions from the formal inversion of long-period P and SH waves for events with m(sub b) greater than or equal to 5.5. Additionally, 11 focal mechanism solutions estimated from the first motion of P-waves and 12 centroid moment tensor solutions of Harvard University are used. The maximum depth of the double seismic zone is 170-180 km. The two planes of seismicity are separated by 40 km at a depth of 50 km, and by 10-15 km at 180 km depth. The focal mechanism solutions of shallow earthquakes show an abrupt change from the thrust to down-dip compressional events at approximately 60 km depth at the upper boundary of the descending slab. Within the descending slab, the earthquakes with down-dip tensional axis form the lower plane of the double-planed deep seismic zone. Several earthquakes with down-dip tensional axis are discovered in a narrow area of the upper seismic zone at the depth of about 50 km. The double seismic zone is revealed clearly in the area between approximately 52 deg N to approximately 54 deg N and probably extends up to approximately 56 deg N.

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