The relationship between crust-mantle structural ratio and seismic activity

（毛桐恩，姚家榴）Ｔｈｅｒｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｅｎｃｒｕｓｔ－ｍａｎｔｌｅｓｔｒｕｃｔｕｒａｌｒａｔｉｏａｎｄｓｅｉｓｍｉｃａｃｔｉｖｉｔｙ￥Ｔｏｎｇ－ＥｎＭＡＯａｎｄＪｉａ－ＬｉｕＹＡＯ（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，Ｓｔ...

The relationship between crust-mantle structural ratio and seismic activity

In this paper the differences and characteristics of the degree of seismic activities of various tectonic blocks and the different parts within the blocks in the eastern part of the Chinese mainland (to the east of 105°E) have been studied. Based on the results, the crust-mantle structural factors which caused these differences have further been studied from the inner and deep part of the plate. The ratio between the crustal and lithospheric thicknesses, i.e. the so-called crust-mantle structural ratioR, has been calculated. The result has shown that the magnitude ofR has a close relation to the degree of seismic activity. TheR-value implies the state of the movement of crust-mantle materials and the degree of interaction between the crust and mantle through convection and intrusion. Contribution No. 94A0053, Institute of Geophysics, SSB, China. The paper is a part of the result of the project supported by the Chinese Joint Seismological Science Foundation. The authors are grateful to Associate Prof. Feng XIE for providing seismic data and also grateful to Prof. Zong-Jin MA, Ji-Wen TENG and Zeng-Jian GUO for their constructive reviews.