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Remote Sens. 2016, 8(4), 323; doi:10.3390/rs8040323

Coseismic Fault Model of Mw 8.3 2015 Illapel Earthquake (Chile) Retrieved from Multi-Orbit Sentinel1-A DInSAR Measurements

Istituto per il Rilevamento Elettromagnetico dell’Ambiente, IREA-CNR, Via Diocleziano 328, 80124 Napoli, Italy
Department of Electrical and Information Technology Engeneering (DIETI), University of Naples, Federico II, via Claudio 21, 80124 Napoli, Italy
Author to whom correspondence should be addressed.
Academic Editors: Zhenhong Li, Zhong Lu and Prasad S. Thenkabail
Received: 28 January 2016 / Revised: 25 March 2016 / Accepted: 7 April 2016 / Published: 12 April 2016
(This article belongs to the Special Issue Earth Observations for Geohazards)
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On 16 September 2015, a Mw 8.3 interplate thrust earthquake ruptured offshore the Illapel region (Chile). Here, we perform coseismic slip fault modeling based on multi-orbit Sentinel 1-A (S1A) data. To do this, we generate ascending and descending S1A interferograms, whose combination allows us to retrieve the EW and vertical components of deformation. In particular, the EW displacement map highlights a westward displacement of about 210 cm, while the vertical map shows an uplift of about 25 cm along the coast, surrounded by a subsidence of about 20 cm. Following this analysis, we jointly invert the multi-orbit S1A interferograms by using an analytical approach to search for the coseismic fault parameters and related slip values. Most of the slip occurs northwest of the epicenter, with a maximum located in the shallowest 20 km. Finally, we refine our modeling approach by exploiting the Finite Element method, which allows us to take geological and structural complexities into account to simulate the slip along the slab curvature, the von Mises stress distribution, and the principal stress axes orientation. The von Mises stress distribution shows a close similarity to the depth distribution of the aftershock hypocenters. Likewise, the maximum principal stress orientation highlights a compressive regime in correspondence of the deeper portion of the slab and an extensional regime at its shallower segment; these findings are supported by seismological data. View Full-Text
Keywords: Illapel (Chile) earthquake; Sentinel 1-A; DInSAR; fault slip analytical model; 2D Finite Element model Illapel (Chile) earthquake; Sentinel 1-A; DInSAR; fault slip analytical model; 2D Finite Element model

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Solaro, G.; De Novellis, V.; Castaldo, R.; De Luca, C.; Lanari, R.; Manunta, M.; Casu, F. Coseismic Fault Model of Mw 8.3 2015 Illapel Earthquake (Chile) Retrieved from Multi-Orbit Sentinel1-A DInSAR Measurements. Remote Sens. 2016, 8, 323.

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