【摘要】 汇编了河南及邻区 196 5～ 2 0 0 0年共 5 2次ML ≥ 3.5地震的震源机制 .分析表明 :震源机制两组节面的走向为北北东向和北西西向 ;P轴多为北东东向 ;T轴大都为北北西向 ;地震断层主要为走滑类型 .菏泽 5 .9级地震前P轴方向呈现出由紊乱到趋向一致的特征 .更多还原

【Abstract】 The focal mechanisms of 52 M L≥3.5 earthquakes in Henan and its adjacent region from 1965 to 2000 are given. The results indicate that the strikes of the two nodal planes of these focal mechanisms are NNE and NWW repectively;most of the principal compressive stress axes P strike NEE and principal extensive stress axes T strike NNW;the seismo tectonics mainly are strike slip faults. The direction of P axes change from tumble into identity before moderate earthquakes.更多还原