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

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.

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Extract seismic deformation field using Chinese optical satellites

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) ◽

10.1109/igarss.2016.7729602 ◽

2016 ◽

Cited By ~ 1

Author(s):

Xue Li ◽

Xiao-li Liu ◽

Qing Wang ◽

Yong-hua Jiang ◽

Liang Li

Keyword(s):

Deformation Field ◽

Seismic Deformation

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

Tectonophysics ◽

10.1016/j.tecto.2012.03.026 ◽

2013 ◽

Vol 584 ◽

pp. 138-143 ◽

Cited By ~ 11

Author(s):

Yanzhao Wang ◽

Min Wang ◽

Zheng-Kang Shen ◽

Weipeng Ge ◽

Kang Wang ◽

...

Keyword(s):

Deformation Field ◽

Yushu Earthquake ◽

Seismic Deformation

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Yushu earthquake Co-seismic deformation field extraction based on ALOS/PALSAR data

2011 International Conference on Remote Sensing, Environment and Transportation Engineering ◽

10.1109/rsete.2011.5964435 ◽

2011 ◽

Author(s):

Shiyong Yan ◽

Huadong Guo ◽

Guang Liu ◽

Zhixing Ruan

Keyword(s):

Deformation Field ◽

Alos Palsar ◽

Yushu Earthquake ◽

Seismic Deformation

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

10.5194/nhess-2015-342 ◽

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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Source characteristics of the Yutian earthquake in 2008 from inversion of the co-seismic deformation field mapped by InSAR

Journal of Asian Earth Sciences ◽

10.1016/j.jseaes.2010.05.011 ◽

2011 ◽

Vol 40 (4) ◽

pp. 935-942 ◽

Cited By ~ 12

Author(s):

Xinjian Shan ◽

Guohong Zhang ◽

Chisheng Wang ◽

Chunyan Qu ◽

Xiaogang Song ◽

...

Keyword(s):

Deformation Field ◽

Source Characteristics ◽

Seismic Deformation

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InSAR Constrained Downdip and Updip Afterslip Following the 2015 Nepal Earthquake: New Insights into Moment Budget of the Main Himalayan Thrust

Remote Sensing ◽

10.3390/rs14020306 ◽

2022 ◽

Vol 14 (2) ◽

pp. 306

Author(s):

Lei Zhao ◽

Chunyan Qu ◽

Dezheng Zhao ◽

Xinjian Shan ◽

Han Chen ◽

...

Keyword(s):

Large Scale ◽

Average Rate ◽

Deformation Field ◽

First Year ◽

Nepal Earthquake ◽

The North ◽

Subsidence Area ◽

Seismic Deformation ◽

Frictional Slip ◽

Uplift Deformation

We use ALOS-2 and Sentinel-1 data spanning 2015-2020 to obtain the post-seismic deformation of the 2015 Mw 7.8 Nepal earthquake. ALOS-2 observations reveal that the post-seismic deformation was mainly distributed in four areas. A large-scale uplift deformation occurred in the northern subsidence area of the co-seismic deformation field, with a maximum uplift of ~80mm within 4.5 yr after the mainshock. While in the southern coseismic uplift area, the direction of the post-seismic deformation is generally opposite to the co-seismic deformation. Additionally, two notable deformation areas are located in the region around 29°N, and near the MFT, respectively. Sentinel-1 observations reveal post-seismic uplift deformation on the north side of the co-seismic deformation field with an average rate of ~20 mm/yr in line-of-stght. The kinematic afterslip constrained by InSAR data shows that the frictional slip is distributed in both updip and downdip areas. The maximum cumulative afterslip is 0.35 m in downdip areas, and 0.2 m in the updip areas, constrained by the ALOS measurements. The stress-driven afterslip model shows that the afterslip is distributed in the downdip area with a maximum slip of 0.3m during the first year after the earthquake. Within the 4.5 years after the mainshock, the estimated moment released by afterslip is ~1.5174 × 1020 Nm,about 21.2% of that released by the main earthquake.

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