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The 2015 Gorkha earthquake investigated from radar satellites: slip and stress modeling along the MHT

Diao, Faqi and Walter, Thomas R. and Motagh, Mahdi and Prats, Pau and Wang, Rongjiang and Samsonov, Sergey V. (2015) The 2015 Gorkha earthquake investigated from radar satellites: slip and stress modeling along the MHT. Frontiers in Earth Science, 3 (65), pp. 1-9. Frontiers Media S.A.. DOI: 10.3389/feart.2015.00065 ISSN 2296-6463

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Official URL: http://journal.frontiersin.org/article/10.3389/feart.2015.00065/abstract

Abstract

The active collision at the Himalayas combines crustal shortening and thickening, associated with the development of hazardous seismogenic faults. The 2015 Gorkha earthquake largely affected Kathmandu city and partially ruptured a previously identified seismic gap. With a magnitude of Mw 7.8 as determined by the GEOFON seismic network, the 25 April 2015 earthquake displays uplift of the Kathmandu basin constrained by interferometrically processed ALOS-2, RADARSAT-2, and Sentinel-1 satellite radar data. An area of about 7000 km2 in the basin showed ground uplift locally exceeding 2 m, and a similarly large area (~9000 km2) showed subsidence in the north, both of which could be simulated with a fault that is localized beneath the Kathmandu basin at a shallow depth of 5–15 km. Coulomb stress calculations reveal that those areas that are laterally extending the active fault zone experienced stress increase, exactly at the location where the largest aftershock occurred (Mw 7.3 on 12. May, 2015). The subparallel faults of the thin-skinned system, in turn, experienced clear stress decrease at locations above (or below) the active fault. Therefore, this study provides insights into the shortening and uplift tectonics of the Himalayas and shows the stress redistribution associated with the earthquake.

Item URL in elib:https://elib.dlr.de/100043/
Document Type:Article
Title:The 2015 Gorkha earthquake investigated from radar satellites: slip and stress modeling along the MHT
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Diao, FaqiGFZUNSPECIFIED
Walter, Thomas R.GFZUNSPECIFIED
Motagh, MahdiGFZUNSPECIFIED
Prats, PauUNSPECIFIEDUNSPECIFIED
Wang, RongjiangGFZUNSPECIFIED
Samsonov, Sergey V.Canada Centre for Mapping and Earth ObservationUNSPECIFIED
Date:29 October 2015
Journal or Publication Title:Frontiers in Earth Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:3
DOI :10.3389/feart.2015.00065
Page Range:pp. 1-9
Publisher:Frontiers Media S.A.
Series Name:Frontiers in Earth Science
ISSN:2296-6463
Status:Published
Keywords:Himalaya, Gorkhaearthquake, thin skinned tectonics, InSAR, slipmodel, coulombstress
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 Flugzeug-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > SAR Technology
Deposited By: Prats, Dr. Pau
Deposited On:30 Nov 2015 07:51
Last Modified:22 Aug 2019 05:03

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