## 6 Conclusions  
In this paper, we used Sentinel-1A ascending and descending track satellite data as the data source to obtain the coseismic deformation field of the 2021 Yangbi Ms 6.4 earthquake in Yunnan. The maximum deformation values of the line of sight of the ascending and descending track were 7.3 cm and 8.9 cm, respectively, and the sign of the deformation field of the two tracks was the opposite. The results indicate that the Yangbi Ms 6.4 earthquake had obvious characteristics of the dextral strike-slip movement. The fault strike was \(132.4^{\circ}\) and the dip was \(76.2^{\circ}\), and the results showed that: the fault slip was mainly distributed in the fault plane about 1-14 km from the surface, the maximum slip at 5 km was 0.6 m, the average slip angle was \(-176.3^{\circ}\), and the coseismic rupture did not extend to the surface. The focal mechanism results were relatively close to the results given by the USGS. The seismogenic fault of the Ms 6.4 earthquake in Yangbi, Yunnan in 2021 was a fault located the northwest of the Weixi-Qiaohou fault; the \(\Delta\)CFS in the north of the middle section of  
Figure 6: Coseismic Coulomb stress failure change caused by the Yangbi earthquake: (**a**) the depth of 3 km; (**b**) the depth of 6 km; (**c**) the depth of 9 km; (**d**) the depth of 12 km; the dark blue dots represent the distribution of aftershocks in a week after the earthquake. MEMF: the middle of the Eryuan-Midu Fault; WX-QHF; Weixi-Qiaohou Fault. the Eryuan-Midu fault was positive, and the Coulomb stress was positive, indicating that the risk of subsequent earthquakes in this area will increase, and we should continue to pay more attention to this area. Conceptualization, W.L., Y.H. and H.Y. ; methodology, W.L., Y.H., X.W. and X.J. ; software, Y.H., X.W. and X.J. ; validation, W.L., Y.H. and X.W. ; formal analysis, W.L., Y.H. and X.L. ; investigation, Y.H. and X.J. ; resources, Y.H. and X.L. ; data curation, W.L., [PERSON] and Q.W. ; writing--original draft preparation, [PERSON] and [PERSON]; writing--review and editing, [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON] and H.Y. ; visualization, [PERSON], [PERSON] and X.L. ; supervision, [PERSON]; project administration, [PERSON] and H.Y. ; funding acquisition, [PERSON] and H.Y. All authors have read and agreed to the published version of the manuscript. This research was funded by National Natural Science Foundation of China (41930101, 41861061), China Postdoctoral Science Foundation (2019M660091 XB), Gansu Higher Education Innovation and Promotion Project (2020A-037), Key Laboratory of Geography and National Condition Monitoring, Ministry of Natural Resources (2022 NGCM01), the Open Research Fund Program of the National Cryosphere Desert Data Center (E01Z790201/2021k07), Natural Science Foundation of Gansu Province (20 IR10 RA271, 21 JK7 RA317), the Young Scholars Science Foundation of Lanzhou Jiaotong University (2019003), \"Young Scientific and Technological Talents Lifting Project\" Project of Gansu Province in 2020 ([PERSON]), \"Tianyou Youth Lifting Project\" Program of Lanzhou Jiaotong University ([PERSON]), and Innovation and Entrepreneurship Education Reform and Cultivation Project in Gansu Province (IA50190117). The seismic statistical results mentioned in the Introduction came from the China Earthquake Network Center. The United States Geological Survey (USGS) was obtained from: [[https://earthquake.usgs.gov/earthquakes/eventpage/us7000e532/executive](https://earthquake.usgs.gov/earthquakes/eventpage/us7000e532/executive)]([https://earthquake.usgs.gov/earthquakes/eventpage/us7000e532/executive](https://earthquake.usgs.gov/earthquakes/eventpage/us7000e532/executive)) (accessed on 30 June 2021). The information for the 2021 Yangbi earthquake from the Global Centroid Moment Tensor (GCMT) was downloaded from [[https://www.globalcmt.org](https://www.globalcmt.org)]([https://www.globalcmt.org](https://www.globalcmt.org)) (accessed on 30 June 2021). Thanks to the ESA for providing free Sentinel-1A SAR data.