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Bookmark or Share- The Shumagin seismic gap structure and associated tsunami hazards ...An Alaskan backstop splay fault zone (BSFZ) extends along the Shumagin margin, filling a gap between BSFZs in adjacent earthquake segments. The BSFZ hanging-wall morphology indicates recent activity in the SW. Morphology bridges a diverse structure observed in seismic images.
- Upper Plate Structure and Megathrust Properties in the Shumagin Gap ...The Shumagin Gap is characterized by high levels of interplate seismicity at depths >25 km (Bécel et al., 2017). Thrust mechanism earthquakes are documented to depths up to 45 km (Abers et al., 1995 ).
- Can a Creeping Segment of the Alaska-Aleutian Subduction Zone Generate ...A team of scientists from the U.S. Geological Survey and partner institutions found no evidence for prehistoric great earthquakes on Simeonof Island in the Shumagin seismic gap that overlies part of the Aleutian megathrust subduction zone known to be creeping—when the two sides of the fault are moving slowly and smoothly past each other ...
- Forearc seismogenesis in a weakly coupled subduction zone ... - NatureThe Shumagin Gap, Alaska, is notable due to a paucity of large earthquake nucleation and weak coupling between the overriding and subducting plates. Fluids have been hypothesized to explain...
- Slipping the Shumagin Gap: A Kinematic Coseismic and Early Afterslip ...In July 2020, a Mw 7.8 earthquake initiated directly to the east of Simeonof Island offshore of the Alaska Peninsula. The earthquake ruptured the eastern part of the Shumagin Gap, a region devoid of large earthquakes over the last century and characterized by low geodetic coupling.
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