澜沧、耿马地震序列图象与发震构造讨论

PRELIMINARY DISCUSSION ON SEISMIC SEQUENCE AND EARTHQUAKE-GENERATING TECTONICS OF LANCANG-GENGMA EARTHQUAKES OF 1988

摘要:

本文分析了1988年11月6日云南澜沧、耿马地震序列的震中分布及迁移图象,发现其地震序列中主震及余震明显地沿北北西向分布。7.2级地震所形成的形变带沿北北西向旱母坝断层分布,表明该断层即为此次地震的发震构造。7.6级地震时,沿北西向木嘎断裂和北北西向澜沧-勐海断裂均形成明显的地震形变带,表明其发震构造较复杂。主震后的强余震活动与北东向断裂有密切关系。本文认为澜沧、耿马地震序列具有复杂的发震构造和破裂图象。

Abstract:

The Lancang-Gengma earthquake sequence of 1988 formed a obvious epicenter zone which is in NNW strike. The events of M7.6 and M7.2 formed it's seismic deformation belt in the ground separately. The earthquake-generating tectonics of M7.2 earthquake is Hanmuba fault in NNW trend. The M7.6 earthquake showed the complicated character of earthquake-generating tectonics, it formed obvious seismic deformation belt separately along Muga fault and Laneang-Menghai fault. The activity of strong aftershoek related to the faults in NE trend in Laneang-Gengma area. Therefore, Laneang-Gengma earthquake sequence has complicated patterns of earthquake-generating tectonics and seismic rupture.