Co-seismic and post-seismic effects of the Tohoku-Oki M W 9.0 earthquake in North and Northeast China

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• 作者：Chengjun Feng ; Peng Zhang ; Chengxuan Tan ; Bangshen Qi…
• 关键词：The 2011 Tohoku ; Oki M W 9.0 earthquake ; Finite element numerical simulation ; Co ; seismic horizontal displacement field ; Regional stress field ; Coulomb failure stress changes
• 刊名：Journal of Seismology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：20
• 期：1
• 页码：333-359
• 全文大小：9,591 KB
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• 作者单位：Chengjun Feng (1) (2)
  Peng Zhang (1) (2)
  Chengxuan Tan (1) (2)
  Bangshen Qi (1)
  Lianjie Wang (1)
  
  1. Institute of Geomechanics, Chinese Academy of Geological Science, Beijing, 100081, China
  2. Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resources, Beijing, 100081, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Structural Geology
  Hydrogeology
  Geotechnical Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-157X

文摘

Using the US Geological Survey (USGS) finite fault model, the co-seismic horizontal displacement and horizontal principal stress field in North and Northeast China generated by the Tohoku-Oki M _W 9.0 earthquake of March 11th, 2011, were retrieved by linear elastic finite element numerical simulation. On this basis, the static Coulomb failure stress variations of the main active faults and tectonic zones in North and Northeast China were calculated, and the triggering effect of the earthquake on seismicity in North and Northeast China was discussed. Results were as follows: (1) the co-seismic horizontal displacement field caused by the great earthquake was eastward in North China; the maximum value, which occurred in the Shandong Peninsula and north Jiangsu Province, was about 12 mm; and the values gradually decreased from east to west. The co-seismic horizontal displacement field in Northeast China was SE鈥揝EE and the maximum value, which occurred in northeast Jilin Province, was about 30 mm. The simulated results for the co-seismic horizontal displacement field were in good agreement with GPS observational results. (2) The near-surface co-seismic maximum horizontal principal stress (螖蟽Hmax) was tensile stress ranging from 0 to 2.0 KPa. From Northeast China to North China, the direction gradually altered from NW to NWW to nearly EW to NEE. The co-seismic minimum horizontal principal stress (螖蟽Hmax) was compressive as well as tensile stress, with a magnitude of 0鈥?.75 KPa, which is approximately equal to zero. From Northeast China to North China, the direction gradually changed to NNW from NE to NNE to nearly NS. Although the co-seismic stress effect generated by the great earthquake had some effect on the present tectonic stress field of North and Northeast China, its influence was too slight to change the present framework of the regional tectonic stress field. (3) Coulomb failure stress variations on active fault zones in North and Northeast China mainly increased; however, the amount of increase was less than 1 KPa. The increases were largest in the middle and northeastern segments of the Tancheng鈥揕ushan fault zone and the Mishan鈥揇unhua fault zone. The Tohoku-Oki Mw9.0 earthquake did have some triggering effect on seismic activity in North and Northeast China, but the effects were limited. Keywords The 2011 Tohoku-Oki M _W 9.0 earthquake Finite element numerical simulation Co-seismic horizontal displacement field Regional stress field Coulomb failure stress changes