| 초록 |
The seismic belt before mid-strong earthquakes in Xinjiang Region is not clear. For this problem, the regional structure background and focal mechanism solutions of Tianshan Mountain area in Xinjiang are contrasted and analyzed with that in Sichuan and Yunnan provinces. The result shows: (1) The regional earthquake structures in Tianshan Mountain area are mainly thrust faults, while ones in Sichuan andYunnan area are mainly strike-slip faults. (2) Since 1970, the focal mechanism solutions of mid-strong earthquakes were mainly reverse and strike-slip types in Tianshan Mountain area, and most of the strike-slip events contained lean components. While ones of Ms6 strong earthquakes area were mainly the strike-slip types in Sichuan and Yunnan area, and the lean component were very small, mainly showed horizontal movement. The weak seismic belts should be applied to earthquakes which are horizontal shear movement in focal mechanism solution. Since the lean components of earthquakes were big in Tianshan Mountain area, the images of the seismic belt before mid-strong earthquakes were vague, and its significance for the earthquake forecast of mid-short term is not good. |
