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Large Scale Observations and Modeling of Strain Partitioning in Guatemala from SAR Interferometry

Cosenza, Beatriz and Lasserre, Cécile and DeMets, Charles and De Zan, Francesco and Ansari, Homa and Feigl, Kurt and Ellis, Andria and Lyon-Caen, Hélène and Briole, Pierre (2019) Large Scale Observations and Modeling of Strain Partitioning in Guatemala from SAR Interferometry. AGU Fall Meeting 2019, 9.-13. Dez.2019, San Francisco, USA.

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

Abstract

The zone of interaction between the Cocos (CO), Caribbean (CA) and North America (NA) plates in Guatemala is defined by the sub-parallel Motagua and Polochic strike-slip faults, a series of north-south-trending extensional grabens immediately south of the Motagua Fault, the Middle America trench, and faults within the Middle America volcanic arc. Historical earthquakes associated with these faults include the destructive 1976 Mw 7.5 earthquake along the Motagua fault and the 2012 Mw 7.5 Champerico thrust earthquake. The latest published GPS-based present-day kinematic model of the region shows that about two-thirds of the strain accumulation from the NA/CA relative motion concentrates on the Motagua fault and one third across the Polochic fault, suggesting that slip varies with time as a result of mechanical interactions within the Motagua-Polochic fault system. As part of the efforts to quantify the present-day kinematics and slip behavior of these faults, we use interferometric synthetic aperture radar (InSAR) to measure the strain rates across faults in Guatemala and to constrain slip partitioning among them. We processed L-band ALOS-1 images spanning from 2006 to 2011, and C-band Sentinel-1 images spanning from 2015 to 2019, from ascending and descending tracks covering the Polochic and Motagua faults, the Ipala and Guatemala City grabens, and part of the volcanic arc to the south. We are using the New Small temporal and spatial baselines (NSBAS) workflow to compute the interferograms, make tropospheric and ionospheric corrections, and perform time-series analysis. We present the first InSAR-based maps of interseismic velocity for this region, which will contribute to the refinement of interseismic locking estimates across the Motagua-Polochic fault system, the subduction zone, and other nearby faults.

Item URL in elib:https://elib.dlr.de/133802/
Document Type:Conference or Workshop Item (Poster)
Title:Large Scale Observations and Modeling of Strain Partitioning in Guatemala from SAR Interferometry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cosenza, BeatrizUniversity of Wisconsin MadisonUNSPECIFIED
Lasserre, CécileUniversity Claude Bernard Lyon 1https://orcid.org/0000-0002-0582-0775
DeMets, CharlesUniversity of Wisconsin Madisonhttps://orcid.org/0000-0001-7460-1165
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
Feigl, KurtUniversity of WisconsinUNSPECIFIED
Ellis, AndriaUNAVCO, Inc. Boulderhttps://orcid.org/0000-0003-2543-0640
Lyon-Caen, HélèneEcole Normale Supérieure Parishttps://orcid.org/0000-0002-6331-0108
Briole, PierreCNRS-ENS, Paris, FranceUNSPECIFIED
Date:2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Tectonics, SAR Interferometry, slip rate, slip partitioning
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 09:10
Last Modified:28 Jan 2020 09:10

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