Abstract
A new interpretation of the 2016 Meinong earthquake is proposed based on the Synthetic Aperture Radar (SAR) satellites, high-rate GPS and strong motion data. The fault geometry is firstly estimated by the Interferometric Synthetic Aperture Radar (InSAR) surface deformation data. Then, the coseismic rupture process is inferred through the 1-Hz GPS and strong motion data based on the estimated fault geometry parameters. The InSAR-derived best-fitting fault geometry model suggests that the preferred fault strike and dip angles are 271.7° and 22.7°, respectively. The inferred fault rupture model indicates that the coseismic fault rupture is a mixed motion of thrust and left-strike slip with the maximum slip of ~ 1.0 m, and the high slip area is located at 9–16 km underground. The snapshots demonstrate that the coseismic fault rupture propagation is along the northwest direction, with the entire duration of ~ 16 s. Besides, the InSAR-derived faulting model reflects that the InSAR observation includes the deformation caused by aseismic slip and aftershock. However, the InSAR-derived fault geometry model can significantly contribute to the estimation of the rupture process based on the high-rate GPS and strong motion data.
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Data availability statement
The generated datasets including the coseismic rupture process model estimated by high-rate GPS and strong motion data, the InSAR surface deformation and the InSAR-derived faulting model are available from the corresponding author on reasonable request. The original high-rate GPS and strong motion data are provided freely (need application) on the website of the Central Weather Bureau of Taiwan.
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Acknowledgements
Appreciation is owed to Hsiu-Fang Lee and Xia Zhong, who helped us to prepare some figures. The ALOS-2 SAR images were provided by the Japan Aerospace Exploration Agency (JAXA) under the ALOS-2 RA6 Project (PI No. 3255 and No. 3105), and Sentinel-1 SAR images were provided by the European Space Agency (ESA). This research is supported by the Fund for Creative Research Groups of China (Grant No. 41521002), the Applied Basic Research Program of Science and Technology Department of Sichuan Province (2020YJ0116), the Open Funding Project of State Key Laboratory of Geohazard Prevention and Geohazard Protection (SKLGP2020K019), the National Key R&D Program of China (Grant Nos. 2018YFC1505402, 2018YFC1504901).
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Y-HY, QC and J-CH contributed to conceptualization; Y-HY and XD contributed to methodology and software; LX and JZ contributed to validation; J-CH contributed to investigation; J-CH and Y-HY provided the resources; Y-HY and XD contributed to writing—original draft preparation; JZ and LX contributed to writing—review and editing; QC and Y-HY contributed to visualization; QC and J-CH contributed to supervision; QC and Y-HY contributed to funding acquisition.
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Yang, YH., Chen, Q., Diao, X. et al. New interpretation of the rupture process of the 2016 Taiwan Meinong Mw 6.4 earthquake based on the InSAR, 1-Hz GPS and strong motion data. J Geod 95, 121 (2021). https://doi.org/10.1007/s00190-021-01570-0
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DOI: https://doi.org/10.1007/s00190-021-01570-0