The dependence of earthquake frequency magnitude relationship and strain energy release upon the focal depth in Hindu Kush region

Abstract

The dependence of earthquake frequency magnitude<br />relationship and the strain energy release upon the focal depth in Hindu<br />Kush region lias been studied based on U.S.C.G.S. data during the years<br />1903-1971 (March) and the results have been compared with those of the<br />other investigators for European and Japanese region. It is seen that there<br />is no positive evidence for the decrease of b in Gutenberg-Ricliter's frequency<br />magnitude relationship with the focal depth. The temporal variation of<br />the elastic strain rebound also for these data does not show the same characteristic<br />pattern as reported by Benioff for the deep focus earthquakes.<br />Emphasis is given also to some facts relating to the seismotectonic regime<br />of Hindu Kusli area.