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Rift-parallel block-like motion of the graben floor during the 2005-2010 Afar rifting episode

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Title: Rift-parallel block-like motion of the graben floor during the 2005-2010 Afar rifting episode
Authors: Himematsu, Yuji Browse this author
Furuya, Masato Browse this author →KAKEN DB
Keywords: Satellite SAR
Pixel tracking
Rifting episode
The East African Rift
ALOS/PALSAR
Issue Date: 20-Sep-2020
Publisher: Elsevier
Journal Title: Tectonophysics
Volume: 791
Start Page: 228571
Publisher DOI: 10.1016/j.tecto.2020.228571
Abstract: Crustal deformations associated with rifting episodes are often explained by both normal faulting and tensile opening in an elastic body, suggesting no significant rift-parallel displacements. In this study, using ALOS/PALSAR pixel-offset and multiple aperture interferometry (MAI) data, we detected similar to 1 m of northwestward block-like cumulative horizontal motion in the graben floor during the latter half of the 2005-2010 Afar rifting episode, Ethiopia. This horizontal block-like motion can be explained by additional shallower strike-slip on normal fault surfaces, which was presumably aseismic due to the very small number of strike-slip earthquakes and a significant gap between seismic and geodetic moment releases. We conclude that the rift-parallel movement can be interpreted by the strain accommodation of plate oblique spreading associated with dike intrusions, as has been demonstrated for the 2014 Baroarbunga dike intrusion episode. Although we do not propose direct evidence for the plate oblique spreading, the complicated tectonic setting caused by the rotation of the Danakil block and the upwelling plume beneath the Afar triple junction may be drivers of the rift-parallel motion associated with the Afar dike intrusion.
Rights: ©2020.This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/86773
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 古屋 正人

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