Sequence of rifting in Afar, Manda‐Hararo rift, Ethiopia, 2005–2009: Time‐space evolution and interactions between dikes from interferometric synthetic aperture radar and static stress change modeling

摘要: Thirteen dike intrusions in the Manda Hararo rift, Afar (Ethiopia), from September 2005 to June 2009, studied using an extensive interferometric synthetic aperture radar (InSAR) data set, provide insight into mechanics of a major active rift. Kinematic inversions InSAR reveal that dikes opened by 0.8–3.5 m at average 5 km depth, with volumes 0.04–0.2 3 (with up 12 opening and volume greater than 1 for megadike). Dikes have their source midsegment magma reservoir, which induces local shallowing brittle‐ductile boundary, presumably due thermal weakening lithosphere. The smaller 2006–2009 were emplaced regions minimum megadike, above central reservoir. In contrast, most voluminous occurred near locus peak maximum ∼10 north source. This may suggest tension on plate boundary was highest there, both prior possibly also after 2005. Evolution distribution normal stress throughout rifting episode indicate reservoir is lower toward segment ends. Average relief stresses tectonic origin coeval comparable shear drops earthquakes, because rift are intruded low pressure high stress.: Time‐space evolution interactions between static change modeling,