• 责任者：Wan Yongge (Institute of Disaster Prevention Science and Technology ; Hebei Sanhe 065201 ; China) ; Shen Zhengkang
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(2)
• 关键词：地震效应 ; seismic effects ; 大震 ; great earthquakes ; 新疆 ; Xinjiang
• 页码：p.280-289
• 图表：4 illus., 1 table, 40 refs.
• 分类号：0500
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

We calculate the Coulomb failure stress changes caused by the 21 March 2008 M_s7.3 Yutian, Xinjiang earthquake on its neighboring faults. The result shows that the Coulomb failure stresses increased along the southwest and northeast segments of the Gonggacuo fault, the east and west segment of the Kengxiwar faults, the west segment of the Pulu fault, the west segment of the Lungmu Co—Bangdag Co, the Altyn Tagh fault and the western Kunlun thrust fault by 6.9×10⁴ Pa, 4.4×10³ Pa, 8.0×10⁵ Pa, 2.8×10³ Pa, 2.3×10⁴ Pa, 5.7×10³ Pa, 1.6×10³ Pa and 1.1×10³ Pa, respectively, decreased along the central segment of the Gonggacuo and Kengxiwar faults, the east segment of the Lungmu Co—Bangdag Co fault, the central segment of 〖JP2〗the Pulu fault, and the north segment of the Karakorum fault by 3.9×10⁵ Pa, 5.8×10⁵ Pa, 1.5×10⁴ Pa,1.5×10⁴ Pa and 1.1×10³ Pa, respectively. We estimated that the characteristic earthquake delayed 1~127 years in the central segment and advanced 2~138 years by the Yutian earthquake according to the slip rate on this fault. The Coulomb failure stress change caused by the 8 October 2005 Pakistan earthquake and projected on the fault plane and slip direction of the Yutian earthquake is 10~20 Pa, and is in favor of its occurrence. The Yutian earthquake has a normal faulting mechanism. Its origin is interpreted as the result of NNE intrusion of the India plate into Eurasia plate, causing with respect to the Tarim Block, the Qaidam Block in the northern part of Qinghai-Tibet Plateau move to the east along the Altyn Tagh Fault, and the Hindukushi Block move to the northwest along Karakorum Fault, respectively. The Yutian earthquake occurred between the Qaidam and Hindukushi Blocks, its east-west extension deformation pattern is resulted from the kinematic relative motion of the two blocks.