The content of this article comes from the 9th issue of Surveying and Mapping Notice in 2022. The review number: GS Jing (2022) No. 0710. Using InSAR technology to observe the sliding and motion mechanism of earthquake faults in Hualien, Taiwan. Liang Bin1, 2, 3, Wei Guanjun1, 2,

2025/07/0618:45:36 hotcomm 1976

The content of this article comes from the 9th issue of Surveying and Mapping Notice, 2022, Issue No.: GS Beijing (2022) No. 0710

Using InSAR technology to observe the sliding and motion mechanism of earthquake faults in Hualien, Taiwan

Liang Bin1,2,3, Wei Guanjun1,2,3

1. School of Surveying and Mapping and Geographic Information, Lanzhou Jiaotong University, Lanzhou 730070, Gansu;

2. National and Local Joint Engineering Research Center for the Application of Geographic National Condition Monitoring Technology, Lanzhou, Gansu 730070, Lanzhou, Gansu;

3. Gansu Provincial Geographic National Condition Monitoring Engineering Laboratory, Gansu Lanzhou, Lanzhou, Gansu 730070

Fund Project : National Natural Science Foundation of China (41964008); Lanzhou Jiaotong University Excellent Platform (201806)

Keywords: Hualien earthquake, InSAR co-seismic deformation, fault sliding, Kulun stress

Citation format: Liang Bin, Wei Guanjun. Analysis of the mechanism of earthquake fault sliding and motion observation of Taiwan using InSAR technology [J]. Surveying and Mapping Bulletin, 2022(9): 68-73.doi: 10.13474/j.cnki.11-2246.2022.0266.

Abstract

Abstract : Based on Sentinel-1 satellite lifting orbit SAR data, the co-seismic deformation field of the Mw6.4 earthquake in Hualien County, Taiwan in 2018 was extracted. The results show that the maximum surface deformation caused by the Hualien earthquake in 2018 was 38.2 cm, mainly uplift, and the maximum relative displacement of the upper and lower plates of the fault was 50 cm. Using the surface deformation data of lifting rails observed by InSAR, the fault three-dimensional sliding distribution model of the two earthquakes in Hualien, Taiwan in 2018 and 2021 was constructed respectively. The results show that the main seismic fault of the Mw6.4 earthquake in Hualien in 2018 was a western tilt hidden fault close to the Milun fault. The maximum sliding volume of the fault was 1.8 m, mainly left-hand strike slip and a small amount of thrust component. The fault rupture spreads to the west side of the Milun fault, affecting the seismic activity of the Lingding fault and the Milun fault. The 2021 Hualien Mw6.0 earthquake occurred in the northern section of Lingding Fault. The maximum sliding volume of the fault is 0.38 m. The fault sliding is mainly left-hand strike-slip. Both earthquake events have high-inclination sliding characteristics. Combining the redistribution of static Coulomb stresses of the two earthquakes and M-T maps, it was found that the 2018 Hualien earthquake triggered the 2021 earthquake, and the stress was transmitted from high latitude to adjacent low latitudes along the fault. The seismic activity in the Hualien area and offshore waters is still strong in the short period, mainly manifested in the frequent occurrence of small earthquakes and the short birth cycle of medium and strong earthquakes.

Author Profile

Author Profile : Liang Bin (1994—), male, master's student, main research directions are deformation monitoring and data processing.

E-mail:[email protected]

Communication author : Wei Guanjun. E-mail:[email protected]

Initial review: Yang Ruifang

Re-examination: Song Qifan

Final review: Jin Jun

Information

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