globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228571
论文题名:
Rift-parallel block-like motion of the graben floor during the 2005–2010 Afar rifting episode
作者: Himematsu Y.; Furuya M.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 791
语种: 英语
中文关键词: Afar ; ALOS/PALSAR ; Pixel tracking ; Rifting episode ; Satellite SAR ; The East African Rift
英文关键词: Earthquakes ; Floors ; Hydraulic structures ; Levees ; Strike-slip faults ; Crustal deformations ; Horizontal motion ; Multiple apertures ; Normal faulting ; Parallel motion ; Strain accommodations ; Strike-slip earthquakes ; Tectonic settings ; Fault slips ; ALOS ; crustal deformation ; fault displacement ; faulting ; graben ; interferometry ; normal fault ; PALSAR ; rifting ; Afar ; Ethiopia
英文摘要: 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 ~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 Bárðarbunga 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. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170603
Appears in Collections:气候变化与战略

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作者单位: Department of Natural History Sciences, Graduate School of Science, Hokkaido University Sapporo, Japan; Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University, Sapporo, Japan; Now at Volcano Disaster Resilience Research Division, National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan

Recommended Citation:
Himematsu Y.,Furuya M.. Rift-parallel block-like motion of the graben floor during the 2005–2010 Afar rifting episode[J]. Tectonophysics,2020-01-01,791
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