Parameter Inversion of the 1997 Mani Earthquake from Insar Co-Seismic Deformation Field Based on Linear Elastic Dislocation Model-II. Slip Distribution Inversion

2007 ◽  
Vol 50 (5) ◽  
pp. 1190-1198 ◽  
Author(s):  
Jian-Bao SUN ◽  
Yao-Lin SHI ◽  
Zheng-Kang SHEN ◽  
Xi-Wei XU ◽  
Fang LIANG
Keyword(s):  
Deformation Field ◽  
Slip Distribution ◽  
Dislocation Model ◽  
Linear Elastic ◽  
Parameter Inversion ◽  
Mani Earthquake ◽  
Seismic Deformation

scholarly journals Coseismic Deformation and Speculative Seismogenic Fault of the 2017 MS 6.6 Jinghe Earthquake, China, Derived From Sentinel-1 Data

2021 ◽  
Vol 9 ◽  
Author(s):  
Wei Feng ◽  
Zechao Bai ◽  
Jinwei Ren ◽  
Shuaitang Huang ◽  
Lin Zhu
Keyword(s):  
European Space Agency ◽  
Image Data ◽  
Junggar Basin ◽  
Deformation Field ◽  
Slip Distribution ◽  
Coseismic Deformation ◽  
Dislocation Model ◽  
Seismogenic Fault ◽  
Geological Investigation ◽  
Maximum Deformation

A MS 6.6 earthquake struck Jinghe County in Bortala Mongol Autonomous Prefecture of Xinjiang Uygur Autonomous Region on August 9, 2017. The earthquake occurred near the eastern part of the Kusongmuxieke Piedmont Fault (KPF) in the southwest of Junggar Basin. Using two pairs of coseismic SAR image data from the ascending and descending tracks from Sentinel-1 (European Space Agency), we processed the interferograms to obtain the coseismic deformation field. We calculate the fault slip distribution of the earthquake based on the elastic half-space rectangular dislocation model with the available location, geometry from seismic data and the coseismic deformation data. The results show that the earthquake deformation field has the typical characteristics of thrust faulting. The uplift deformation field is about 28 km long and 20 km wide. The maximum displacements of InSAR line-of-sight to the ascending and descending tracks are 49 and 68 mm, respectively. The main slip is concentrated at the depth of 10–20 km. The inverted seismic moment is equivalent to a moment magnitude MW 6.3. This result is very similar to the slip distribution from the seismological inversion. The maximum deformation area and the distribution of aftershocks are both on the west side of the mainshock. They mutually confirm the characteristics of a unilateral rupture. According to stress triggering theory, the aftershocks within 1 month after the mainshock in the layer 10–14 km deep may have been triggered by the mainshock, and the transferred stress increases the seismic risk of the eastern section of the KPF fault. After more than 1 year, a MS 5.4 earthquake occurred to the southwest of the MS 6.6 Jinghe earthquake. Beacause the stress drop change (<0.01 MPa) is too small for the MS 5.4 earthquake to have been directly triggered. Based on the analysis of multisource data and the detailed geological investigation, the thrust Jinghenan fault which north of Kusongmuxieke Piedmont fault is inferred to be the seismogenic fault of the MS 6.6 Jinghe earthquake.

scholarly journals Co-Seismic Inversion and Post-Seismic Deformation Mechanism Analysis of 2019 California Earthquake

2021 ◽  
Vol 13 (4) ◽  
pp. 608
Author(s):  
Chengsheng Yang ◽  
Ting Wang ◽  
Sainan Zhu ◽  
Bingquan Han ◽  
Jihong Dong ◽  
...  
Keyword(s):  
Seismic Inversion ◽  
Slip Distribution ◽  
Focal Mechanism Solution ◽  
Dislocation Model ◽  
Seismic Events ◽  
Mechanism Analysis ◽  
Seismic Slip ◽  
Tectonic Environment ◽  
Maximum Subsidence ◽  
Seismic Deformation

In July 2019, a series of seismic events, including a magnitude (Mw) 7.1 mainshock and Mw 6.4 foreshock, occurred in Eastern California. Studying these seismic events can significantly improve our understanding of the Eastern California tectonic environment. Sentinel-1A and ALOS-2 PALSAR images were utilized to obtain co-seismic deformation fields, including mainshock and foreshock deformation. The Okada elastic dislocation model and ascending and descending orbit results were used to invert the co-seismic slip distribution and obtain a co-seismic focal mechanism solution. Using ascending Sentinel-1A images, a time-series deformation was obtained for 402 d after the earthquake, and the deformation evolution mechanism was analyzed. The maximum uplift caused by the co-seismic mechanism reached 1.5 m in the line of sight (LOS), and the maximum subsidence reached 1 m in the LOS. For 402 d after the earthquake, the area remained active, and its deformation was dominated by after-slip. The co-seismic inversion results illustrated that California earthquakes were mainly strike-slip. The co-seismic inversion magnitude was approximately Mw 7.08. The Coulomb stress change illustrated that the seismic moment caused by the co-seismic slip was 4.24 × 1026 N × m, which is approximately Mw 7.06. This finding is consistent with the co-seismic slip distribution inversion results.

scholarly journals Co-seismic and post-seismic deformation, field observations and fault model of the 30 October 2020 Mw = 7.0 Samos earthquake, Aegean Sea

2021 ◽  
Author(s):  
Athanassios Ganas ◽  
Panagiotis Elias ◽  
Pierre Briole ◽  
Sotiris Valkaniotis ◽  
Javier Escartin ◽  
...  
Keyword(s):  
Aegean Sea ◽  
Fault Model ◽  
Deformation Field ◽  
Field Observations ◽  
Seismic Deformation

scholarly journals Interplate Slip Distribution Inferred from Co- and Post-seismic Deformation Associated with the 2005 Miyagi-oki Earthquake (M7.2)

2007 ◽  
Vol 59 (4) ◽  
pp. 371-379
Author(s):  
Satoshi MIURA ◽  
Takeshi IINUMA ◽  
Satoshi YUI ◽  
Toshiya SATO ◽  
Kenji TACHIBANA ◽  
...  
Keyword(s):  
Slip Distribution ◽  
Seismic Deformation

Inter-seismic deformation field of the Ganzi-Yushu fault before the 2010 Mw 6.9 Yushu earthquake

2013 ◽  
Vol 584 ◽  
pp. 138-143 ◽  
Author(s):  
Yanzhao Wang ◽  
Min Wang ◽  
Zheng-Kang Shen ◽  
Weipeng Ge ◽  
Kang Wang ◽  
...  
Keyword(s):  
Deformation Field ◽  
Yushu Earthquake ◽  
Seismic Deformation

scholarly journals Coseismic deformation field derived from Sentinel-1A data and slip inversion of the 2015 Chile Mw8.3 earthquake

2016 ◽  
Author(s):  
Ronghu Zuo ◽  
Chunyan Qu ◽  
XinJian Shan ◽  
Yingfeng Zhang ◽  
Guohong Zhang ◽  
...  
Keyword(s):  
Surface Deformation ◽  
Joint Inversion ◽  
Fault Slip ◽  
Deformation Field ◽  
Seismogenic Zone ◽  
Coseismic Deformation ◽  
Dislocation Model ◽  
Coulomb Stress ◽  
Coseismic Slip ◽  
Single Plane

Abstract. We obtain the coseismic surface deformation fields caused by the Chile Mw8.3 earthquake on 16 September 2015 through analyzing Sentinel-1A/IW InSAR data from ascending and descending tracks. The results show that the main deformation field looks like a half circle convex to east with maximum coseismic displacement of about 1.33 m in descending LOS direction, 1.32 m in ascending LOS direction. Based on an elastic dislocation model in a homogeneous elastic half space, we construct a small-dip single plane fault model and invert the coseismic fault slip using ascending and descending Sentinel-1A/IW data separately and jointly. The results show that the patterns of the main slip region are similar in all datasets, but the scale of slip from ascending inversion is relatively smaller. Joint inversion can display comprehensive fault slip. The seismic moment magnitude from the joint inversion is Mw8.25, the rupture length along strike is about 340 km with a maximum slip of 8.16 m near the trench located at –31.04 N, –72.49 E, and the coseismic slip mainly concentrates at shallow depth above the hypocenter with a symmetry shape. The depth where coseismic slip is near zero appears to a depth of 50 km, quantitatively indicating the down-dip limit of the seismogenic zone. From the calculated coseismic Coulomb stress change, we find aftershocks locations correlate well with the areas having increased Coulomb stress and most areas with increased Coulomb stress appeared beneath the main shock fault plane.

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