科研之友
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摘要
On November 25, 2016, an M(S)6. 7 earthquake struck Aketao county (Aketao M(S)6. 7 earthquake), Kizilsu Prefecture, Xinjiang Autonomous Region. With the seismic recording data collected inside and outside our country, we relocated the hypocenters of the main-shock and the aftershocks with magnitudes above M(L)4. 0, inverted for their focal mechanisms, relocated 434 aftershocks by means of the DD method, and inverted for the spatio-temporal rupture process of the main-shock in order to analyze the source complexity, and then calculated the intensities of the epicentral area based on the inverted finite-dynamic source model. The results show that, the events occurred within a small and local basin which stretches generally from east to west, are very likely caused by a new or burried fault. The seismogenic fault is nearly vertical, strikes almost from east to west, and is of generally right-lateral strike-slip. The rupture started on the western side of the hypocenter firstly, then on the eastern side, and very soon the rupture propagated toward to both east and west simultaneously, and then the rupturing on the western side stopped firstly while the rupturing on the eastern side remained, and eventually the rupturing ended on the eastern side. The whole process lasted about 20 s, releasing scalar moment of 1. 08X 10(19)N center dot m, corresponding to moment magnitude M-w 6. 6. The rupture process resulted in two patches with higher slip values on two sides of the hypocenter, respectively, with the western one having a smaller dimension than the eastern one. From the estimated intensity pattern, the long axis orientation of the intensity ellipse is generally consistent with the rupture-orientation of the main-shock as well as the distribution-orientation of the aftershocks, the maximal intensity is close to IX, concentrating in a small area on the eastern side, the VIII-intensity area is of spindle shape lying on both the eastern and western sides of the epicenter, respectively, and the V-to-VII intensity areas have elliptical shapes. In general, the intensities are relatively larger in east than in west.
- 出版日期2017-4
- 单位中国地震局
