SEISMOGENIC STRUCTURE OF THE <i>M</i><sub>s</sub>7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN

FU Guochao; LÜ Tongyan; SUN Dongxia; XIONG Renwei

2017 Vol. 23, No. 6

Article Contents

Article navigation > Journal of Geomechanics > 2017 > 23(6): 799-809

Next Article Previous Article

FU Guochao, LÜ Tongyan, SUN Dongxia, XIONG Renwei. SEISMOGENIC STRUCTURE OF THE Ms7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN[J]. Journal of Geomechanics, 2017, 23(6): 799-809.

Citation:

FU Guochao, LÜ Tongyan, SUN Dongxia, XIONG Renwei. SEISMOGENIC STRUCTURE OF THE M_s7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN[J]. Journal of Geomechanics, 2017, 23(6): 799-809.

SEISMOGENIC STRUCTURE OF THE M_s7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Institute of Earthquake Sciences, China Earthquake Administration, Beijing 100036, China

More Information

Corresponding author: LÜ Tongyan, tongyan_2000@163.com

Received Date: 30 August 2017

Publish Date: 25 December 2017

Abstract

Abstract

An M_s7.0 earthquake struck Jiuzhaigou county at 9:19 pm on August 8, 2017 in Aba Prefecture of Sichuan Province. The epicenter was located in the intersection area of the Huya fault on the east boundary of the Bayan Har block and the Tazang fault on the east section of the East Kunlun fault, with complicated seismotectonic settings. This earthquake caused damages to houses and roads, and landslides collapsed. According to the data of high-resolution satellite image interpretation, the measurement data of tectonic deformation and dating data, it shows that the east section of the Tazang fault has been dominated by left-lateral strike-slip accompanied with thrust faulting; the horizontal sliding rate is about 2.7~4.1 mm/yr, and the vertical sliding rate is about 0.56~0.6 mm/yr. Combined with the distribution of major earthquake and aftershocks and the results of major earthquake source mechanism solution, a three-dimensional seismic structure model is established. The analysis reveals that this earthquake belongs to strike-slip earthquake with the main rupture angle of 57°~77°. It was caused by the eastward push of the Qinghai-Tibet Plateau mass, and the seismogenic fault may be a branch of the Tazang fault. According to the study of historical earthquakes, active faults and deformation observation, the Bayan Kala block has significant strong earthquake tectonic background, and it is necessary to continue to pay attention to the seismic activity and deformation of the boundary of the block.
- Jiuzhaigou M_s7.0 earthquake /
- the east section of the Tazang fault /
- active fault /
- seismogenic structure /
- the Bayan Har block

FullText(HTML)

References

[1]	Tapponnier P, Zhiqin X, Roger F, et al. Oblique stepwise rise and growth of the Tibet plateau[J]. Science, 2001, 294(5547):1671. doi: 10.1126/science.105978 CrossRef Google Scholar
[2]	Zhang P Z, Shen Z, Wang M, et al. Continuous deformation of the Tibetan Plateau from global positioning system data[J]. Geology, 2004, 32(9):809~812. doi: 10.1130/G20554.1 CrossRef Google Scholar
[3]	Beaumont C, Jamieson R A, Nguyen M H, et al. Himalayan tectonics explained by extrusion of a low-viscosity crustal channel coupled to focused surface denudation[J]. Nature, 2001, 414(6865):738. doi: 10.1038/414738a CrossRef Google Scholar
[4]	Wang Q, Zhang PZ, Freymueller JT, et al. Present-day crustal deformation in China constrained by global positioning system measurements[J]. Science, 2001, 294(5542):574. doi: 10.1126/science.1063647 CrossRef Google Scholar
[5]	马杏垣.中国岩石圈动力学地图集[M].北京:中国地图出版社, 1989. 16. Google Scholar MA Xingyuan. Lithospheric Dynamics Atlas of China[M]. Beijing:SinoMaps Press, 1989. 16. (in Chinese) Google Scholar
[6]	周荣军, 蒲晓虹, 何玉林, 等.四川岷江断裂带北段的新活动、岷山断块的隆起及其与地震活动的关系[J].地震地质, 2000, 22(3):285~294. Google Scholar ZHOU Rongjun, PU Xiaohong, HE Yulin, et al. Recent activity of Minjiang fault zone, uplift of Minshan block and their relationship with seimicacity of Sichuan[J]. Seismology and Geology, 2000, 22(3):285~294. (in Chinese with English abstract) Google Scholar
[7]	唐文清, 刘宇平, 陈智梁, 等.岷山隆起边界断裂构造活动初步研究[J].沉积与特提斯地质, 2004, 24(4):31~34. Google Scholar TANG Wenqing, LIU Yuping, CHEN Zhiliang, et al. The preliminary study of the tectonic activities along the boundary faults around the Minshan uplift, western Sichuan[J]. Sedimentary Geology and Tethyan Geology, 2004, 24(4):31~34. (in Chinese with English abstract) Google Scholar
[8]	周荣军, 李勇, Densmore A L, 等.青藏高原东缘活动构造[J].矿物岩石, 2006, 26(2):40~51. Google Scholar ZHOU Rongjun, LI Yong, Densmore A L, et al. Active tectonic of the eastern margin of the Tibet plateau[J]. Journal of Mineralogy and Petrology, 26(2):40~51. (in Chinese with English abstract) Google Scholar
[9]	李勇, 周荣军, Densmor A L, 等.青藏高原东缘龙门山晚新生代走滑-逆冲作用的地貌标志[J].第四纪研究, 2006, 26(1):40~51. Google Scholar LI YONG, ZHOU Rongjun, Densmore A L, et al. Geomorphic evidenve for the late Ceno Zo IC Strike-SL Ipping and thrusting in Longmen outain in at the eastern margin of the Tibetan plateau[J]. Quaternary Sciences, 2006, 26(1):40~51. (in Chinese with English abstract) Google Scholar
[10]	唐荣昌, 陆联康. 1976年松潘、平武地震的地震地质特征[J].地震地质, 1981, 3(2):41~47. Google Scholar TANG Rongchang, LU Liankang. On the seismic geological characteristics of 1976 Songpan-Pingwu Earthquakes[J]. Seismology and Geology, 1981, 3(2):41~47. (in Chinese with English abstract) Google Scholar
[11]	胡朝忠. 塔藏断裂晚第四纪活动性研究[D]. 北京: 中国地震局地震预测研究所, 2011. Google Scholar HU Chaozhong. Late Quaternary activity of the Tazang fault[D]. Beijing:Institute of Earthquake Science, CEA, 2011.(in Chinese with English abstract) Google Scholar
[12]	Kirby E, Harkin N, Wang E Q, et al. Slip-rate gradients along the eastern kunlun fault[J]. Tectonics, 2006, 26(2):TC2010. Google Scholar
[13]	张军龙, 任金卫, 陈长云, 等.东昆仑断裂带东部晚更新世以来活动特征及其大地构造意义[J].中国科学:地球科学, 2014, 44(4):654~667. Google Scholar ZHANG Junlong, REN Jinwei, CHEN Changyun, et al. The Late Pleistocene activity of the eastern part of east Kunlun fault zone and its tectonic significance[J]. Science China:Earth Sciences, 2014, 57(3):439~453. Google Scholar
[14]	Ren J, Xu X, Yeats R S, et al. Millennial slip rates of the Tazang fault, the eastern termination of Kunlun fault:implications for strain partitioning in eastern Tibet[J]. Tectonophysics, 2013, 608(8):1180~1200. Google Scholar
[15]	盛书中, 万永革, 王未来, 等. 2010年玉树M_s 7.1地震发震断层面参数的确定[J].地球物理学进展, 2014, 29(4):1555~1562. doi: 10.6038/pg20140409 CrossRef Google Scholar SHENG Shuzhong, WAN Yongge, WANG Weilai, et al. The fault plane parameter determination of the 2010 Yushu Ms 7.1 earthquake[J]. Process in Geophysics, 2014, 29(4):1555~1562. (in Chinese with English abstract) doi: 10.6038/pg20140409 CrossRef Google Scholar
[16]	马晓雪, 吴中海, 李家存, 等.龙门山构造带南段向西南延伸的遥感影像证据及地震地质意义[J].地质力学学报, 2016, 22(3):548~567. Google Scholar MA Xiaoxue, WU Zhonghai, LI Jiacun, et al. Remote sensing evidence of the south segment of Long Menshan fault zone extending to southwest and its seismic geological significance[J]. Journal of Geomechanics, 2016, 22(3):548~567. (in Chinese with English abstract) Google Scholar
[17]	李凯, 吴中海, 李家存, 等.江西九江及邻区主要断裂活动性遥感综合分析[J].地质力学学报, 2016, 22(3):577~593. Google Scholar LI Kai, WU Zhonghai, LI Jiacun, et al. Comprehensive remote sensing analysis on activities of the main faults in Jiujiang and adjacent areas, Jiangxi[J]. Journal of Geomechanics, 2016, 22(3):577~593. (in Chinese with English abstract) Google Scholar
[18]	Anderson J G. Estimating the seismicity from geological structure for seismic-risk studies[J]. Bulletin of the Seismological Society of America, 1979, 69(1):135~158. Google Scholar
[19]	Molnar P. Earthquake recurrence intervals and plate tectonics[J]. Bulletin of the Seismological Society of America, 1978, 69(1):115~133. Google Scholar
[20]	Thiel C C. "Probabilities of large earthquakes in the San Francisco bay region" and "probabilities of large scale earthquakes occurring in California on the San Andreas fault"[J].Earthquake Spectra, 1990, 6(4):811~814. doi: 10.1193/1.1585598 CrossRef Google Scholar
[21]	Nishigami K. Deep crustal heterogeneity along and around the San Andreas fault system in central California and its relation to the segmentation[J]. Journal of Geophysical Research Solid Earth, 2000, 105(B4):7983~7998. doi: 10.1029/1999JB900381 CrossRef Google Scholar
[22]	邵志刚, 傅容珊, 薛霆虓, 等.昆仑山Ms 8.1级地震震后变形场数值模拟与成因机理探讨[J].地球物理学报, 2008, 51(3):805~816. Google Scholar SHAO Zhigang, FU Rongshan, XUE Tingxiao, et al. The numerical simulation and discussion on mechanism of postseismic deformation after Kunlun Ms 8.1 Earthquake[J]. Chinese Journal of Geophysics, 2008, 51(3):805~816. (in Chinese with English abstract) Google Scholar
[23]	张岳桥, 董树文, 侯春堂, 等.四川芦山2013年M_s7.0地震发震构造初步研究[J].地质学报, 2013, 87(6):747~758. Google Scholar ZHANG Yueqiao, DONG Shuwen, HOU Chuntang, et al. Preliminary study on the Seismotectonies of the 2013 Lushan M_s7.0 earthquake, West Sichuan[J]. Acta Geologica Sinica, 2013, 87(6):747~758. (in Chinese with English abstract) Google Scholar
[24]	Molnar P. The growth of the Tibetan Plateau and Mio-Pliocene evolution of East Asian climate[J]. Palaeontologia Electronica, 2005, 8(1):131~142. Google Scholar
[25]	张培震, 徐锡伟, 闻学泽, 等. 2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报, 2008, 51(4):1066~1073. Google Scholar ZHANG Peizhen, XU Xiwei, WEN Xueze, et al. Slip rates and recurrence intervals of the Longmen Shan active fault zone, and tectonic implications for the mechanism of the May 12 Wenchuan earthquake, 2008, Sichuan, China[J]. Chinese Journal of Geophysics, 2008, 51(4):1066~107. (in Chinese with English abstract) Google Scholar