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一、引言近年来,国外地震资料表明,一些大地震发生并不受地表已知活动断裂的控制,地震后也不形成相应规模的地表破裂带,这种特殊类型的地震常发生在活褶皱和隐伏的逆断裂带上。据有关资料介绍属此类地震的有:1980年阿尔及利亚阿斯南(E L Asnam)7.6级地震,1983年美国科林加(Colinga)6.5级地震以及1906年发生在我国新疆玛纳斯的7.7级地震等。其共同特征是,地震时地表变形以褶皱变形(隆起)为主,一般不出现
I. INTRODUCTION In recent years, the overseas seismic data show that the occurrence of some major earthquakes is not controlled by faults known on the earth’s surface. After the earthquake, no corresponding surface rupture zone is formed. Such special types of earthquakes often occur in the areas of active folds and Concealed reverse fracture zone. According to relevant information, such earthquakes are as follows: the 1980 magnitude earthquake in EL Asnam, Algeria, the 1983 Colinga 6.5-magnitude earthquake in the United States and the 7.7-magnitude event in Manas, Xinjiang, China, in 1906 Earthquake and so on. The common feature is that the deformation of the earth’s surface is dominated by folds (bumps) and generally does not appear