49. Regional Study on the Characteristic Seismicity of the World : Part 1. Hindu Kush Region

概要

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Foci distribution of the earthquakes in and around Hindu Kush region (25°N～45°N, 65°E～85°E) during the period from January 1964 to April 1969 was studied with relation to the topography. A remarkable localized and quite well-known upper mantle earthquake area beneath Hindu Kush was found to have an earthquake nest of approximately (30km)3 in volume centering at 36.35°N, 70.75°E and 215km, in which about 50 seismic events have originated during the whole period of 64 months. Other shallower foci in the upper mantle have gathered above the nest and formed V-shaped pockets along the profiles of N-S and/or NW-SE directions with the nest in their bottoms. A suggestion was given for the existing of such V-shaped seismic pocket in the upper mantle in the restricted region. A pronounced minimum seismic activity, on the other hand, was found around the depth of 160km. Seismic zones of shallow earthquakes with depths shallower than 50 km run parallel to several trends of mountain chains. The generation of upper mantle earthquakes beneath Hindu Kush appears to be connecting with the compressive force due to the interaction of Asian and Indian continental blocks.|本研究のねらいは,世界中で特殊な地震活動をしている地域をさがして,その地震活動の特徴を調べ,地震を起こすしくみについての研究をさらにおしすすめるための資料を提供することにある.
1969-12-20