摘要
本文探讨由同震倾斜阶跃按静态位错模式反演震源参数的原理和方法,提出了降维法,该法把同震倾斜阶跃的量值和方向分别处理,用其方向分布求解断层的走向、倾角和滑动角,用其量值求解断层长、宽和错动量。应用降维法对菏泽5.9级地震和海原5.5级地震的研究表明,该法能取得令人满意的结果。本文认为:荷泽5.9级地震震源断层是北北东向的,以走滑为主,兼有倾滑分量,倾角很小,地震看来是发生在聊考断裂带上或受其控制。
The principle and method of source parameter inversion from coseismic tilt steps are treated. The Dimension Reduction Method is put forward. This method deals with coseismic tilt step values and their directions separately, using the step directions to determine the optimal strike, dip angle and slip angle and the step values to determine the optimal length, width and slip dislocation. Results obtained from the study of Heze earthquake (M_s=5.9)and Haiyuan earthquake(M_s=5.5) by using the Dimension Reduction Method show that it is a effective method in dealing with coseismic tilt steps. The earthquake fault of Heze earthquake has a strike of NNE, a main strike-slip with some dip-slip dislocation, and s small dip angle.The authors believe that Heze earthquake occured on the Liaokao fault belt or was controled by it.
出处
《地壳形变与地震》
CSCD
1990年第1期13-20,共8页
Crustal Deformation and Earthquake
