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Volcano‐Wide Deformation After the 2017 Erta Ale Dike Intrusion, Ethiopia, Observed With Radar Interferometry
Author(s) -
Xu Wenbin,
Xie Lei,
Aoki Yosuke,
Rivalta Eleonora,
Jónsson Sigurjón
Publication year - 2020
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2020jb019562
Subject(s) - geology , volcano , seismology , magma , subsidence , interferometric synthetic aperture radar , dike , caldera , rift , intrusion , magma chamber , deformation (meteorology) , tectonics , synthetic aperture radar , geophysics , petrology , geomorphology , remote sensing , geochemistry , oceanography , structural basin
Erta Ale Volcano erupted on 16 January 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 January 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.