1411年西藏当雄南8级地震发震构造

Seismogenic Structures of the 1411 Southern Damxung Earthquake of M=8 in Tibet

本文详细讨论了1411年西藏当雄南8级地震的发震构造。指出:念青唐古拉山南东麓断层是1411年当雄南8级地震的发震断层;本次地震的宏观震中位于拿色果—嘎尔波果拉分盆地内部张剪切断层与盆地南西侧新活动幅度大的次级走滑断层的交汇部位;震区的地球物理场有明显的异常特征。这表明1411年当雄南8级地震的发生不仅受浅层构造控制,而且也有深部构造背景。

The seismogenic structures of the 1411 southern Damxung earthquake of M = 8 in Tibet are discussed in detail in this paper. It is pointed out that the Nyainqentanglha southern pediment fault is the seismogenic fault of 1411 southern Damxung earthquake of M = 8, and the macroepicenter locates at the intersection of internal tensile shear fault of Naseguo-Gaebuoguo pull-apart basin and subparalell secondary fault which moves more stronger than another one during late Quaternary, both the subparalell secondary faults consisting of the pull-apart basin. Besides,there is obvious abnormality of maga-netic,gravitational and geothermal fields in the vicinity of macroepicenter area.