Intermediate-depth earthquakes beneath the Pamir-Hindu Kush Region:Evidence for collision between two opposite subduction zones

摘要

We employed a double-difference algorithm(hypoDD)to relocate earthquakes within the region bounded by 66°E-78°E and 32°N-42°N in the period of 1964?2003 reported by the International Seismological Center(ISC).The improved hypocentral locations delineate a double-layered Wadati-Benioff zone in the eastern Hindu Kush intermediate seismic belt.Based on this feature and other evidences,we propose that the intermediate-depth earthquakes beneath the Pamir-Hindu Kush region may occur in two collided subduction zones with opposite dip directions.