Coseismic Fault Slip of the September 16, 2015 Mw 8.3 Illapel, Chile Earthquake Estimated from InSAR Data

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• 作者：Yingfeng Zhang ; Guohong Zhang ; Eric A. Hetland ; Xinjian Shan…
• 关键词：The 2015 Illapel earthquake ; InSAR displacement ; coseismic slip model ; faults reactivation ; coulomb stress change
• 刊名：Pure and Applied Geophysics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：173
• 期：4
• 页码：1029-1038
• 全文大小：10,029 KB
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• 作者单位：Yingfeng Zhang (1) (2)
  Guohong Zhang (1)
  Eric A. Hetland (3)
  Xinjian Shan (1)
  Shaoyan Wen (1) (4)
  Ronghu Zuo (1)
  
  1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, 100029, China
  2. China University of Petroleum (East China), School of Geoscience, Qingdao, 266580, China
  3. Earth and Environmental Sciences, University of Michigan, Ann Arbor, 48109, USA
  4. Earthquake Administration of Xinjiang, Uygur Autonomous Region, Urumqi, 830002, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9136

文摘

The complete surface deformation of 2015 Mw 8.3 Illapel, Chile earthquake is obtained using SAR interferograms obtained for descending and ascending Sentinel-1 orbits. We find that the Illapel event is predominantly thrust, as expected for an earthquake on the interface between the Nazca and South America plates, with a slight right-lateral strike slip component. The maximum thrust-slip and right-lateral strike slip reach 8.3 and 1.5 m, respectively, both located at a depth of 8 km, northwest to the epicenter. The total estimated seismic moment is 3.28 × 1021 N.m, corresponding to a moment magnitude Mw 8.27. In our model, the rupture breaks all the way up to the sea-floor at the trench, which is consistent with the destructive tsunami following the earthquake. We also find the slip distribution correlates closely with previous estimates of interseismic locking distribution. We argue that positive coulomb stress changes caused by the Illapel earthquake may favor earthquakes on the extensional faults in this area. Finally, based on our inferred coseismic slip model and coulomb stress calculation, we envision that the subduction interface that last slipped in the 1922 Mw 8.4 Vallenar earthquake might be near the upper end of its seismic quiescence, and the earthquake potential in this region is urgent.