Abstract

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 3Ddisplacement 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.

Autore Pugliese

• Bovenga Fabio

Tutti gli 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 volume/Rivista

Seismological research letters

Anno di pubblicazione

2018

ISSN

0895-0695

ISBN

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Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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