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Joint inversion of geodetic observations and relative weighting-the 1999 Mω 7.6 chi-chi earthquake revisited

Lookup NU author(s): Marine Roger, Professor Zhenhong Li, Professor Peter ClarkeORCiD, Dr Chuang Song



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© 2020 by the authors.The Mw 7.6 Chi-Chi earthquake struck central western Taiwan in 1999. The rupture was complex with several dislocations along the 100-km long Chelungpu thrust fault. Revisiting this earthquake is a challenge, as the precision and coverage of the data sets available are quite poor. Furthermore, the topographic and vegetation coverage complexity of the area prevents coherent radar images. In this paper, radar and optical images, and terrestrial geodetic measurements, were utilised to study the fault. The Particle Swarm Optimization and Okada Inversion (PSOKINV) geodetic inversion package was used with the generalized Akaike's Bayesian Information Criterion (gABIC) to precisely determine the slip distribution and relative weighting of datasets. Differences in results using the data sets jointly or separately (e.g., under-estimation due to InSAR, inconsistencies in SPOT offsets, smoother slip distribution with gABIC weighting) are observable. Most of the energy was released in the northern part of the fault, where the strike veers toward the east, and mainly at depths less than 4 km. The PSOKINV-gABIC approach is viable for the study of complicated cases such as the Chi-Chi earthquake and can significantly benefit the weight determination and physical realism of the fault geometry.

Publication metadata

Author(s): Roger M, Li Z, Clarke P, Song C, Hu J-C, Feng W, Yi L

Publication type: Article

Publication status: Published

Journal: Remote Sensing

Year: 2020

Volume: 12

Issue: 19

Online publication date: 23/09/2020

Acceptance date: 19/09/2020

Date deposited: 04/12/2020

ISSN (electronic): 2072-4292

Publisher: MDPI AG


DOI: 10.3390/RS12193125


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