中国大陆及边邻地区6 级以上地震序列的最大余震统计特征

Statistic features of maximum aftershock of earthquake sequences with MS≥6. 0 in Chinese mainland and its border region

摘要:

依据1966 年以来中国大陆及边邻地区记录相对完备的6 级以上地震序列资料，统计研究了地震的破裂类型和不同破裂类型下余震序列特征等，得到了不同破裂类型下不同余震序列比例和优势分布、主震震级与最大余震震级差的经验关系。主震与最大余震的震级关系线性较好，得到的经验公式可以为中国大陆及边邻地区同类地震的最大余震震级判定提供参考;最大余震发生在主震后10 天内的比例为43. 8% ～ 81. 8% ，正断型和走滑型中的孤立型的最大余震发生在主震后10 天内的比例高达80% 。

Abstract:

Based on data of earthquake sequences with MS≥6. 0 in Chinese mainland and the border region since 1966，the paper studies different rupture types of the main shock and aftershock sequence characteristics under different fracture types． We obtain the experiential formula of the different proportion of aftershock，distribution of advantage，magnitude difference between main shock and maximum aftershock under different fracture types． Main shock magnitude and maximum aftershock magnitude have good linear relationship，and this kind empirical formula can provide the reference for the determination of maximum aftershock magnitude in Chinese mainland． The occurrence of maximum aftershock within 10 days after the main shock is 43. 8% ～ 81. 8%，while that of isolated maximum aftershock of strike-slip type and normal fracture type within 10 days after the main shock is up to 80% ．