Abstract
The dependence of earthquake frequency magnitude relationship and the strain energy release upon the focal depth in Hindu Kush region lias been studied based on U.S.C.G.S. data during the years 1903-1971 (March) and the results have been compared with those of the other investigators for European and Japanese region. It is seen that there is no positive evidence for the decrease of b in Gutenberg-Ricliter's frequency magnitude relationship with the focal depth. The temporal variation of the elastic strain rebound also for these data does not show the same characteristic pattern as reported by Benioff for the deep focus earthquakes. Emphasis is given also to some facts relating to the seismotectonic regime of Hindu Kusli area.
Highlights
SUMMARY. — The dependence of earthquake frequency magnitude relationship and the strain energy release upon the focal depth in Hindu Kush region lias been studied based on U.S.C.G.S. data during the years 1903-1971 (March) and t h e results have been compared with those of the other investigators for European and Japanese region
I t has been established by Miyamura (15), t h a t the magnitude frequency behaviour of each earthquake region bears a close relation to the tectonic stage of development of t h a t region
I t may be seen from Table 3, t h a t the value of b remains almost constant for all the focal depth intervals considered for Hindu Kush region
Summary
SUMMARY. — The dependence of earthquake frequency magnitude relationship and the strain energy release upon the focal depth in Hindu Kush region lias been studied based on U.S.C.G.S. data during the years 1903-1971 (March) and t h e results have been compared with those of the other investigators for European and Japanese region. — The dependence of earthquake frequency magnitude relationship and the strain energy release upon the focal depth in Hindu Kush region lias been studied based on U.S.C.G.S. data during the years 1903-1971 (March) and t h e results have been compared with those of the other investigators for European and Japanese region. The magnitude frequency behaviour of different earthquake regions has been discussed by many authors ever since Gutenberg and Richter (10) established the formula: logio N = a — bM i or. I t has been established by Miyamura (15), t h a t the magnitude frequency behaviour of each earthquake region bears a close relation to the tectonic stage of development of t h a t region. Examining many seismicity investigations it can readily be concluded, that the tectonically younger stage is represented by the larger value of b and the older stage by the smaller value of b
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