Volcano-wide deformation after the 2017 Erta Ale dike intrusion, Ethiopia, observed with radar interferometry
Type
ArticleKAUST Department
Crustal Deformation and InSAR GroupEarth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2020-06-25Online Publication Date
2020-08-12Print Publication Date
2020-08Embargo End Date
2020-12-25Submitted Date
2020-02-11Permanent link to this record
http://hdl.handle.net/10754/663907
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Erta Ale volcano erupted on 16 Jan. 2017 in a difficult-to-access terrain in the Erta Ale volcanic range in Ethiopia. Like many other rifting ridge volcanoes, little is known about the properties of the deep magma plumbing system. Here, we analyze interferometric synthetic aperture radar data from different satellites between late Jan. 2017 and May 2019 to study the ground deformation after the start of the intrusion to infer the possible geometry and volume change of the magma reservoir that fed the eruption. We identified volcano-wide subsidence of up to 9 cm and horizontal contraction of up to ~5 cm that extend from Erta Ale to neighboring volcanoes. The modeling results suggest that an off-rift NE-SW elongated mid-crustal source is required to explain the observed volcano-wide deformation, but the depth is poorly constrained and the shape is complex. We suggest the presence of vertical interactions between stacked mid-crustal magma sources. Our study demonstrates that a considerable volume of melt could have been stored in mid-crustal magma reservoirs within the slow-spreading Erta Ale ridge to facilitate recent volcanic activity.Citation
Xu, W., Xie, L., Aoki, Y., Rivalta, E., & Jónsson, S. (2020). Volcano-wide deformation after the 2017 Erta Ale dike intrusion, Ethiopia, observed with radar interferometry. Journal of Geophysical Research: Solid Earth, e2020JB019562. doi:10.1029/2020jb019562Publisher
American Geophysical Union (AGU)Additional Links
http://doi.wiley.com/10.1029/2020JB019562https://agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.1029/2020JB019562
ae974a485f413a2113503eed53cd6c53
10.1029/2020jb019562
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