期刊
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
卷 357, 期 -, 页码 56-67出版社
ELSEVIER
DOI: 10.1016/j.jvolgeores.2018.04.004
关键词
Subsidence; Afar; InSAR; Geothermal; Magmatic
资金
- Michael Dreyfus PhD Alumni Scholarship
- NERC COMET+
- NERC RiftVolc Grant [NE/I01372X/1]
- IGSSA, Addis Ababa University, Addis Ababa, Ethiopia
- STEP programme, International Centre for Theoretical Physics (ICTP), Trieste, Italy
- NERC [come30001, NE/L01372X/1] Funding Source: UKRI
Observations of ground deformation in East Africa have been fundamental for unveiling the tectonics of continental rifting, assessing the seismic and volcanic hazard to development, and identifying geothermal resources. Here we investigate the active natural and anthropogenic processes in the Tendaho Graben, Afar using Interferometric Synthetic Aperture Radar (InSAR) collected by the Envisat satellite in 2004-2010. We used the Poly-lnterferometric Rate And time series Estimation (pi-RATE) method to calculate displacement in satellite line-of-sight, and a least-square inversion to decompose the line-of-sight displacement into vertical and rift perpendicular components. We observe two zones of deformation: a 20 km wide circular region of subsidence located 10 km northeast of the town of Semera with a maximum displacement rate of similar to 5 cm/yr; and elongated zone (50 km) of subsidence in the area of the geothermal prospect, maximum rate of similar to 4 cm/yr. The temporal characteristics of subsidence varies between these zones, with an increase in subsidence rate observed in the circular region in August 2008. We used a Bayesian inversion to find the best fitting source models and compared this to locations of seismicity and other geophysical observations. The pattern of deformation is consistent with a combination of magmatic and geothermal processes, but there does not appear to be a direct link to a sequence of dyke intrusions during 2005-2010 at Manda Hararo graben similar to 60 km away, but dynamic stress changes or deep crustal flow could account for the observations. (C) 2018 The Authors. Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据