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Surface displacements in the September 2005 Afar rifting event from satellite image matching: Asymmetric uplift and faulting

Barisin, Ivana and Leprince, Sébastien and Parsons, Barry and Wright, Tim (2009) Surface displacements in the September 2005 Afar rifting event from satellite image matching: Asymmetric uplift and faulting. Geophysical Research Letters, 36 (7). L07301. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20090624-075541662

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Abstract

Combining sub‐pixel analysis of SPOT4 images with InSAR measurements, we generate 3D surface displacements for the September 2005 rifting event on the Dabbahu Segment in the Afar valley. The axis of rifting in the event is shifted to the east of the geomorphic rift. The horizontal displacements reveal 6 m of extension, and vertical displacements show asymmetric uplift of the flanks of the dike. Simple forward modelling indicates this asymmetry is due to the dike dipping 80° to the west towards the geomorphic rift. The boundary between eastward and westward displacements aligns with the transition between uplift and subsidence on the east in the north part of the segment, but on the west in the south. Normal faulting is not required on both sides of the instantaneous rift. East‐dipping normal faulting on the west side of the instantaneous rift aligns with a west‐dipping normal fault in the topography.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2008GL036431DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/2009/2008GL036431.shtmlPublisherUNSPECIFIED
ORCID:
AuthorORCID
Leprince, Sébastien0000-0003-4555-8975
Additional Information:© 2009 American Geophysical Union. Received 22 October 2008; accepted 23 January 2009; published 1 April 2009. This research has been supported by the Natural Environment Research Council through the Centre for the Observation and Modelling of Earthquakes and Tectonics (COMET) and the National Centre for Earth Observation, and by the Royal Society through a fellowship to TW. SAR and SPOT data were provided by the European Space Agency. COSI-CORR was developed thanks to support from NSF grant EAR 0636097 and partial funding from the Gordon and Betty Moore Foundation. We are grateful for the advice of Jean-Philippe Avouac, who made possible the visits of IB and BP to the Tectonics Observatory at Caltech. We also thank Cindy Ebinger for sending us her paper before publication.
Funders:
Funding AgencyGrant Number
Natural Environment Research CouncilUNSPECIFIED
National Centre for Earth ObservationUNSPECIFIED
Royal SocietyUNSPECIFIED
NSFEAR 0636097
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20090624-075541662
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090624-075541662
Official Citation:Barisin, I., S. Leprince, B. Parsons, and T. Wright (2009), Surface displacements in the September 2005 Afar rifting event from satellite image matching: Asymmetric uplift and faulting, Geophys. Res. Lett., 36, L07301, doi:10.1029/2008GL036431.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14434
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Aug 2009 16:28
Last Modified:09 Mar 2020 13:19

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