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A Blind Thrust and Overlying Folding Earthquake of the 2016 Mw 6.0 Hutubi Earthquake in the Northern Tien Shan Fold‐and‐Thrust Belts, China

2019; Seismological Society of America; Volume: 109; Issue: 2 Linguagem: Inglês

10.1785/0120180150

1943-3573

Yinghui Yang, Jyr‐Ching Hu, Qiang Chen, Ze‐Gen Wang, Min‐Chien Tsai,

Geological and Geochemical Analysis

Research Article| January 29, 2019 A Blind Thrust and Overlying Folding Earthquake of the 2016 Mw 6.0 Hutubi Earthquake in the Northern Tien Shan Fold‐and‐Thrust Belts, China Ying‐Hui Yang; Ying‐Hui Yang aDepartment of Remote Sensing and Surveying Engineering, Southwest Petroleum University, Chengdu 610500, People's Republic of China, xzhfhyyy@126.com, zegen01@126.com Search for other works by this author on: GSW Google Scholar Jyr‐Ching Hu; Jyr‐Ching Hu bDepartment of Geosciences, National Taiwan University, Taipei 10617, Taiwan, R.O.C., jchu@ntu.edu.tw Search for other works by this author on: GSW Google Scholar Qiang Chen; Qiang Chen cDepartment of Remote Sensing and Geoinformation Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China, swjtucq@sina.com Search for other works by this author on: GSW Google Scholar Ze‐Gen Wang; Ze‐Gen Wang aDepartment of Remote Sensing and Surveying Engineering, Southwest Petroleum University, Chengdu 610500, People's Republic of China, xzhfhyyy@126.com, zegen01@126.com Search for other works by this author on: GSW Google Scholar Min‐Chien Tsai Min‐Chien Tsai dSeismological Center, Central Weather Bureau, Taipei 10048, Taiwan, R.O.C., minchyen@scman.cwb.gov.tw Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (2019) 109 (2): 770–779. https://doi.org/10.1785/0120180150 Article history first online: 29 Jan 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Ying‐Hui Yang, Jyr‐Ching Hu, Qiang Chen, Ze‐Gen Wang, Min‐Chien Tsai; A Blind Thrust and Overlying Folding Earthquake of the 2016 Mw 6.0 Hutubi Earthquake in the Northern Tien Shan Fold‐and‐Thrust Belts, China. Bulletin of the Seismological Society of America 2019;; 109 (2): 770–779. doi: https://doi.org/10.1785/0120180150 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract The 2016 Mw 6.0 Hutubi earthquake occurred in the northern Tien Shan fold‐and‐thrust belts, China. However, the coseismic fault rupture model and the seismotectonics of the 2016 Hutubi earthquake remain uncertain up to the present due to the small magnitude, deep hypocenter, and no surface rupture caused by the seismogenic fault. Here, we show the evidence that the 2016 Hutubi earthquake occurred on a deep (15–20 km) blind‐thrust fault, and the rupture of the blind fault triggers the slip of a shallow overlying fold. Ascending and descending Interferometric Synthetic Aperture Radar (InSAR) observations captured by Sentinel‐1A/1B satellites are used to construct the seismogenic structure of the 2016 Hutubi earthquake. It is found that a single fault fails to provide a good fit to the observed Sentinel‐1 ascending and descending InSAR deformation. A shallow fault‐bend fold with strike along the surface trace of the Qigu anticline and a varying dip angle along the down‐dip direction is proposed in this study based on the geodetic observations, which significantly improves the model fit to the InSAR observations. The estimated faulting model shows that the 2016 Hutubi earthquake occurred on a deep blind fault with 264.4° strike and 28.8° dip, and significant fault slip is located at the depth of 13–18 km with a peak slip of ∼10.0 cm⁠. The triggered shallow fault‐bend fold has a listric surface with slight predominant thrust slip. The static Coulomb stress change from the mainshock on the shallow fold structure is negative, which indicates the dynamic stress may play a more important role than the static stress in the triggering of the shallow fault‐bend fold in this case. The result of this study suggests that a moderate earthquake with a deep hypocenter has the potential to trigger the rupture of the shallow overlying fault‐bend fold in this zone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.