Quantitative Constraints on Faulting and Fault Slip Rates in the Northern Main Ethiopian Rift

We found that the rift border faults strike approximately NE, while the younger faults in the rift segments strike NNE

Melanie Siegburg

2020

Scholarcy highlights

  • A quantitative understanding of fault networks and their kinematics including growth, reactivation, and interaction in magma‐assisted continental rifts has been hampered by a lack of chronological constraints, but studies worldwide provide a qualitative framework
  • In this paper we build on previous studies from Iceland; Hawaii; the Taupo Rift Zone, New Zealand; and the East African Rift by characterizing the structural style of the active Boset magmatic segment of the northern Main Ethiopian Rift
  • We observe a small change in the obliquity of ~7° over several magmatic segments, suggesting the northern MER is associated with transtensional kinematics with an increasing shear component northwards
  • Detailed structural analyses of fault networks, kinematics, and activity on segments in a magma‐assisted continental rift were applied to the MER and in more detail on the BMS to estimate fault activity rates, characterize the structural style of a segment, and understand the relative contribution of faulting
  • We found that the BMS is characterized by two main NNE orientated fault zones, bounding a nested graben and a remnant caldera
  • Normal faults with the largest vertical displacement and displacement:length ratio are observed outside the volcanic edifice on the entire western fault zone and toward the segment tips of the central fault zone

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