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dc.contributor.authorDemissie Z.S.
dc.contributor.authorRimmington, Glyn M.
dc.date.accessioned2022-05-13T17:14:02Z
dc.date.available2022-05-13T17:14:02Z
dc.date.issued2022-04-12
dc.identifier.citationDemissie, Z. S., & Rimmington, G. (2022). Surface Displacements Mechanism of the Dobi Graben from ASAR Time-Series Analysis of InSAR: Implications for the Tectonic Setting in the Central Afar Depression, Ethiopia. Remote Sensing, 14(8), 1845. https://doi.org/10.3390/rs14081845
dc.identifier.issn20724292
dc.identifier.urihttp://doi.org/10.3390/rs14081845
dc.identifier.urihttps://soar.wichita.edu/handle/10057/23310
dc.descriptionThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/
dc.description.abstractThe Dobi graben is a Quaternary, NW-trending continental rift found within the East-Central Block (ECB) of the Afar Depression (AD) in Ethiopia. The AD might be the only place where three active rifts meet on land. This diffused, Rift–Rift–Rift (RRR) triple junction in the ECB comprises the overlap zone between the Red Sea and the Gulf of Aden propagators. Rifting is ongoing in the Dobi graben as evidenced by the August 1989 earthquakes (of magnitude 5.7 < MW < 6.2). This study carried out a surface displacement time-series analysis to examine the kinematics of the Dobi graben and the surrounding area using 18 ascending orbit scenes (between May 2005 and March 2010) along tract 257 and 15 along the descending orbit (tract 006) of the Advanced Synthetic Aperture Radar (ASAR), C-band (λ = 5.6 cm) acquired by the ENVIronmental SATellite (ENVISAT). We utilized the Small Baseline Algorithm (SBA) techniques of the distributed scatterer, which were implemented independently to generate Line of Sight (LOS) displacement maps. These LOS displacement surface movements, identified in both geometries, can be interpreted as ± signs of predominantly vertical movement in both geometries: positive for uplifting and negative for subsidence. Additionally, opposite signs of ± horizontal movement in both geometries indicate that the movement is from East to West (or vice versa). Results from the velocity and displacement maps and time series analysis suggest that creeping is associated mainly with normal faulting and could be the primary mechanism for strain distribution for the Southeastern part of the Dobi graben. The anomalous, continuous uplifting exhibited at the rift shoulder and in the horst area might be linked to the presence of temporary reactivation of normal faulting in the region. The oblique, positive LOS signals observed in different parts of the Dobi graben might serve as a proxy for understanding how strain is accommodated as normal faulting and is distributed in a distinct northeast direction. This explanation supports both the arguments for the Northeast migration of the triple junction and the transfer of strain from the southernmost Red Sea Rift (RSR) to the Central AD.
dc.description.sponsorshipWe are grateful to our colleagues from Wichita State University, Oklahoma State University and Addis Ababa University who read the draft manuscript and provided comments that greatly assisted the research and greatly improved the manuscript. This is Wichita State University Department of Geology?s contribution # 2022-01. This work was supported by the Wichita State University, Department of Geology.
dc.language.isoen_US
dc.publisherMDPI
dc.relation.ispartofseriesRemote Sensing
dc.relation.ispartofseriesVolume 14, Issue 8
dc.subjectEast Africa Rift System
dc.subjectAfar Depression
dc.subjectSmall Baseline Subset Algorithm
dc.subjectStrain distribution and accommodation
dc.subjectTime series surface displacement
dc.titleSurface displacements mechanism of the Dobi Graben from ASAR time-series analysis of InSAR: Implications for the tectonic setting in the Central Afar Depression, Ethiopia
dc.typeArticle
dc.rights.holder2022 by the authors


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