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Alaska megathrust 1: Seismicity 43 years after the great 1964 Alaska megathrust earthquake [PDF]
Journal of Geophysical Research: Solid Earth, 2013 AbstractThe largest moment release during the 1964 Mw 9.2 Alaska earthquake was on the portion of the megathrust under the eastern Kenai Peninsula and the Prince William Sound. The area is currently locked geodetically and corresponds to where the Yakutat terrane is subducting.
Geoffrey A Abers, YoungHee Kim
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Weakening basaltic megathrusts
Nature Reviews Earth & Environment, 2021An article in JGR Solid Earth identified that basalt-hosted megathrusts are not necessarily the nucleation source of large megathrust earthquakes.
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Dynamic lithospheric response to megathrust and precursory seismicity features of megathrust
Physics of the Earth and Planetary Interiors, 2014Abstract Temporal variations of seismic properties in inner trench regions before and after three megathrusts with magnitudes greater than or equal to 8.8 since 2004 are investigated to understand the nature of megathrust earthquakes. The seismicity was increased significantly, and the fault-type compositions changed after megathrusts. The seismicity
Junhyung Lee, Tae-Kyung Hong
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Geometric controls on megathrust earthquakes
Geophysical Journal International, 2020SUMMARYThe role of subduction zone geometry in the nucleation and propagation of great-sized earthquake ruptures is an important topic for earthquake hazard, since knowing how big an earthquake can be on a given fault is fundamentally important. Past studies have shown subducting bathymetric features (e.g.
Gavin P Hayes, Steven M Plescia
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Subslab heterogeneity and giant megathrust earthquakes
Nature Geoscience, 2021The nucleation and rupture processes of giant megathrust earthquakes (M ≥ 9.0) in subduction zones are still controversial. Most previous studies have focused on the subducting plate interface, and the structure beneath the subducting slab and its influence on earthquake generation remain unclear.
Jianke Fan, Dapeng Zhao
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Alaska Megathrust 2: Imaging the megathrust zone and Yakutat/Pacific plate interface in the Alaska subduction zone [PDF]
Journal of Geophysical Research: Solid Earth, 2014 AbstractWe image the slab underneath a 450 km long transect of the Alaska subduction zone to investigate (1) the geometry and velocity structure of the downgoing plate and their relationship to slab seismicity and (2) the interplate coupled zone where the great 1964 earthquake (Mw 9.2) exhibited the largest amount of rupture.
YoungHee Kim +2 more
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Silent Heralds of Megathrust Earthquakes?
Science, 2004D uring an earthquake, rupture propagates along the fault plane within a few tens of seconds. Much slower rupture, lasting for weeks or months, has recently been observed in slip transients or slow earthquakes ([1][1], [2][2]).
Alfred Hirn, Mireille Laigle
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Strong yet creeping megathrust faults
Science, 2014Earthquake Dynamics Powerful faults in subduction zones, called “megathrust faults,” produce the largest earthquakes on Earth. Gao and Wang use heat flow data to show that when the faults subduct jagged sea floor, they generate tamer earthquakes than do faults that subduct smooth sea floor. The rugged sea floor brings irregularities into the fault that
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Corrugated megathrust revealed offshore from Costa Rica
Nature Geoscience, 2018Exhumed faults are rough, often exhibiting topographic corrugations oriented in the direction of slip; such features are fundamental to mechanical processes that drive earthquakes and fault evolution. However, our understanding of corrugation genesis remains limited due to a lack of in situ observations at depth, especially at subducting plate ...
Joel H. Edwards +8 more
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