Abstract
AbstractThe distribution of earthquakes in the western Pacific were studied using the hypocenters determined by ISC. from 1970 to 1998. The result shows that the dip angles of the Benioff zone are correlated with the velocity of plate movement in different regions, the dip angle turns to be smaller while velocity becomes higher. Focal mechanisms of Mb ≥ 5.0 from 1976 to 2002 were studied using the data from Harvard university. It shows that the type of fault is related with the velocity of plate motion. In the area of higher plate velocity, the thrust‐fault number is more than 74%; in the area of smaller velocity, the normal‐fault number rises up to about 45%. In this paper, the driving force direction for the western Pacific horizontal movement is discussed, the direction is 283‐.
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