摘要
计算和研究了不同类型地震断层上的潮汐库仑破裂应力及其随纬度变化特征;通过对全球20395个地震断层发震时潮汐库仑破裂应力的计算,研究了受到潮汐库仑破裂应力促滑作用的不同类型地震断层的纬度分布特征.结果表明,断层上潮汐库仑破裂应力的性质和特征与断层的类型、走向和位置密切相关,同一时间段内不同类型地震断层土的潮汐库仑破裂应力变化特征不同,同一断层在不同纬度处的潮汐库仑破裂应力的大小和符号都存在较大的差别.潮汐库仑破裂应力对断层的促滑作用,对正断层在低纬和中纬地区较突出、对逆断层在中高纬地区较明显、对走滑断层随纬度增加而减小.
The tidal Coulomb failure stresses （TCFS） on various kinds of seismic faults are calculated and their latitudinal characters are studied. We compute tidal Coulomb failure stresses at shock occurring times on 20395 earthquake faults and analyze the latitudinal distribution of various types of nature seismic faults that are slip-encouraged by TCFS. The results show that the features of tidal failure stress are closely correlated with fault type, fault strike and fault location. The TCFS variation properties are different on various kinds of fault during the same period. And there are obvious differences in amplitudes and signs of TCFS on same kind fault at different latitudinal regions. For normal faults, the tidal slip-encouraged effects are outstanding in low and middle latitudinal region; for thrust faults, the tidal slip-encouraged effects are outstanding in middle and high latitudinal region; for strike-slip fault, the tidal slip-encouraged effects are reducing with latitude increasing.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期756-763,共8页
Chinese Journal of Geophysics
基金
国家自然科学基金(40764001)资助
关键词
地震断层
潮汐正应力
潮汐剪应力
潮汐库仑破裂应力
纬度特征
Seismic fault, Tidal normal stresses, Tidal shear stresses, Tidal Coulomb failurestresses, Latitudinal features
