关键词: 东昆仑活动断裂带, 托索湖7.5级地震, 地震地表破裂带, 宏观震中

Abstract: The East Kunlun active fault zone, which lies in the valley of the Kunlun Mountains above the elevation of 4,000 meters, is an important active fault in the Northeast Tibetan Plateau. The Tuosuohu Lake earthquake of magnitude 7.5 in 1937 occurred in the eastern segment of the East Kunlun active fault zone. Four field investigations have been launched on this seism in 1963,1971 and between 1986 and 1990 respectively, and four different conclusions have been gained. From the length aspect of the surface deformation zone of this earthquake, it is commonly recognized that its east end lies in the west side of the main Ridge of Animaqing Mountains; the opinion about the west end and the location of the macro-epicenter is different. Based on our investigation and comprehensive study, a series scientific problems like geometric and kinetic characteristics, the length of the rupture zone, the maximum sinistrally horizontal displacement and the macro-epicenter were reestimated. It is considered that the total length of this zone should be at least 240km; the maximum sinistrally horizontal displacement is 8m, the maximum vertical displacement is 3.5m; the macro-epicenter is in Sanchakou.

Key words: the East Kunlun active fault zone, the M_s7.5 Tuosuohu Lake earthquake in 1937, the earthquake surface rupture zone, Macro-epicenter