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Lateral Variations of Interseismic Coupling along the Himalayan Arc in Bhutan : Clues from Time Series Analysis of Sentinel-1 InSAR Data ?

Lasserre, Cécile and Marconato, Léo and Sassolas-Serrayet, Timothée and De Zan, Francesco and Ansari, Homa and Doin, Marie-Pierre and Mazzotti, Stephane and Cattin, Rodolphe and Ferry, Matthieu Alexis (2019) Lateral Variations of Interseismic Coupling along the Himalayan Arc in Bhutan : Clues from Time Series Analysis of Sentinel-1 InSAR Data ? AGU Fall Meeting 2019, 9.-13. Dez. 2019, San Francisco, USA.

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Official URL: https://www.agu.org/fall-meeting

Abstract

A recent GPS study suggests interseismic coupling variations along the Main Himalayan Thrust in Bhutan, with implications on the regional seismic potential (Maréchal et al., 2016). We use the complete Sentinel-1 radar data acquired since 2014 along descending and ascending orbits to provide average velocity maps across the front range in Bhutan, based on radar interferometry (InSAR). We compare results from time series analysis from a Small Baseline Subset approach (NSBAS, Doin et al., 2011, Grandin, 2015) and Distributed Scatterers Interferometry techniques to better assess and mitigate the various sources of noise in our data set (Ansari et al., 2018, De Zan et al., 2015). We correct tropospheric delays using global atmospheric models (ERA5, ECMWF) and ionospheric delays with split-spectrum technique (Gomba et al., 2016), to improve the quality of the deformation signal especially at large scale. We finally confront GPS and InSAR velocity profiles across range through simple 2D elastic modelling to better constrain the displacement rate across the range and discuss the existence of shallow creep in eastern Bhutan, as suggested by GPS data.

Item URL in elib:https://elib.dlr.de/133805/
Document Type:Conference or Workshop Item (Poster)
Title:Lateral Variations of Interseismic Coupling along the Himalayan Arc in Bhutan : Clues from Time Series Analysis of Sentinel-1 InSAR Data ?
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lasserre, CécileUniversity Claude Bernard Lyon 1https://orcid.org/0000-0002-0582-0775
Marconato, LéoUniversity Claude Bernard Lyon 1UNSPECIFIED
Sassolas-Serrayet, TimothéeGéosciences Montpellierhttps://orcid.org/0000-0002-2059-1931
De Zan, Francescofrancesco.dezan (at) dlr.dehttps://orcid.org/0000-0002-1643-2559
Ansari, HomaHoma.Ansari (at) dlr.dehttps://orcid.org/0000-0002-4549-2497
Doin, Marie-PierreUniv. Grenoble AlpesUNSPECIFIED
Mazzotti, StephaneGéosciences Montpellierhttps://orcid.org/0000-0003-2514-4310
Cattin, RodolpheGéosciences Montpellierhttps://orcid.org/0000-0002-9825-9568
Ferry, Matthieu AlexisGéosciences Montpellierhttps://orcid.org/0000-0002-6498-7807
Date:2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Main Himalayan Thrust, tectonics, interseismic coupling, SAR Interferometry
Event Title:AGU Fall Meeting 2019
Event Location:San Francisco, USA
Event Type:international Conference
Event Dates:9.-13. Dez. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: De Zan, Francesco
Deposited On:28 Jan 2020 09:15
Last Modified:28 Jan 2020 09:15

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