Insights into Seismogenic Deformation during the 2018 Hualien, Taiwan, Earthquake Sequence from InSAR, GPS, and Modeling
- Resource Type
- Authors
- Yo Ho Chang; Ray Y. Chuang; Hao Kuo-Chen; Jiun-Yee Yen; Chung Pai Chang; Y. Kuo; Chih Heng Lu; Chi Yu Chiu; Wen Yen Chang; Rebecca J. Dorsey; Fabio Bovenga; Chun Chin Wang
- Source
- Seismological research letters 90 (1) (2018): 1–10. doi:10.1785/0220180228
info:cnr-pdr/source/autori:Yen J.-Y., Lu C.-H., Dorsey R. J., Kuo-Chen H., Chang C.-P., Wang C.-C., Chuang R. Y., Kuo Y.-T., Chiu C.-Y., Chang Y.-H., Bovenga F., Chang W.-Y./titolo:Insights into seismogenic deformation during the 2018 Hualien (Taiwan) earthquake sequence from InSAR, GPS and modeling/doi:10.1785%2F0220180228/rivista:Seismological research letters/anno:2018/pagina_da:1/pagina_a:10/intervallo_pagine:1–10/volume:90 (1)
- Subject
- 3D surface displacement
010504 meteorology & atmospheric sciences
business.industry
GPS
Deformation (meteorology)
010502 geochemistry & geophysics
Geodesy
01 natural sciences
SAR Pixel Offset
fault modeling
SAR Interferometry
Geophysics
Interferometric synthetic aperture radar
Global Positioning System
seismic event
business
Geology
0105 earth and related environmental sciences
Sequence (medicine)
- Language
- ISSN
- 1938-2057
0895-0695
We provide new data and insights into a 6 February 2018 Mw 6.4 earthquake that shook the city of Hualien in eastern Taiwan at the leading edge of a modern arc-continent collision. Fatalities and damages were concentrated near the Milun fault and extended south to the northern Longitudinal Valley fault. Although the Hualien area has one of the highest rates of seismicity in Taiwan, the geologic structures responsible for active deformation were not well understood before this event. We analyzed Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data and produced a 3D displacement model with InSAR and azimuth offset of radar images to document surface deformation induced by this earthquake. The 3D displacement model was inverted to estimate slip on the Milun fault.We find that models assuming a single fault are inconsistent with observations of coseismic deformation and regional strain patterns, providing evidence for linked slip on a little-studied offshore thrust belt. Based on data presented here and elsewhere, we propose a odel for transpressive deformation in a zone of oblique convergence and left-lateral wrench tectonics to explain this and a prior 1951 M 7.3 earthquake.