Journal
EARTH PLANETS AND SPACE
Volume 72, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s40623-020-01300-4
Keywords
Jiashi earthquake; InSAR; Coseismic deformation; Source model; Coulomb stress
Categories
Funding
- Scientific Research Fund of Institute of Seismology [IS2018126282, IS2018126285]
- National Natural Science Foundation of China [41731071, 41874015]
- Spark Program of Earthquake Technology of CEA [XH18054]
- Institute of Crustal Dynamics, CEA [IS2018126282, IS2018126285]
Ask authors/readers for more resources
On January 19, 2020, an M-w 6.0 earthquake occurred in Jiashi, Xinjiang Uygur Autonomous Region of China. The epicenter was located at the basin-mountain boundary between the southern Tian Shan and the Tarim Basin. Interferometric Synthetic Aperture Radar (InSAR) is used to obtain the coseismic deformation field from both ascending and descending Sentinel-1A satellite images of the European Space Agency. The results showed that the coseismic deformation is distributed between the Kalping fault and the Ozgertaou fault. The earthquake produced significant deformation over an area of approximately 40 km by 30 km. The maximum and minimal displacements along the line of sight (LOS) are 5.3 cm and -4.2 cm for the ascending interferogram and are 7.2 cm and -3.0 cm for the descending interferogram, respectively. The fault geometry from the Multi peak Particle Swarm Optimization computation indicates that the seismogenic fault is a shallow low-dipping planar fault that is 4.58 km depth underground. The finite slip model inverted by the Steepest Descent Method implies that the rupture is dominated by a thrust fault. The slips are concentrated in a depth of 5-7 km with a maximum slip of 0.29 m. The estimated total seismic moment is 1.688x10(18) Nm, corresponding to a magnitude of M-w 6.1. The seismogenic fault is the Kalping fault which has a listric structure. The coseismic deformation only occurred on the decollement layer and did not involve the ramp segment. The coseismic Coulomb stress changes have enhanced the stress on the deep margin of the Jiashi earthquake rupture area, indicating that there is still the possibility of strong earthquakes in this region in the future.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available