不同类型地震的地震矩-震级标度关系研究

STUDY ON RELATIONS BETWEEN SEISMIC MOMENT AND MAGNITUDE FOR VARIOUS TYPES OF EARHQUAKE SEQUENCE

摘要:

收集整理了中国大陆1977~2001年发生的107次M≥5.0地震的震型、震源机制、发震断层、地震矩等参数,在此基础上研究了不同震型、不同断层性质地震的地震矩与震级的关系。结果表明,地震矩和震级标度关系中直线的斜率与地震视应力和介质非均匀程度相联系,走滑断层地震的视应力和介质的非均匀程度均高于非走滑断层地震,走滑断层中孤立型地震的视应力和介质的非均匀程度均低于多震型地震。

Abstract:

The types of earthquake sequence, focal mechanisms,main fault planes and seismic moments of 107 earthquake events with M≥5.0 in Chinese mainland from 1977 to 2001 are gathered.Based on the events the relations between seismic moment and magnitude for different fault properties and different types of earthquake sequence are discussed.The result shows that the relation is linear and the line slops directly relats to the earthquake apparent stress and heterogeneous extend of mediums.For both apparent stress and heterogeneous extend of medium, in the strike-slip fault event are higher than in the non-strike-slip fault event,and in the isolated type of earthquake sequence are lower than in the multiple type of earthquake sequence.