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- W1907970824 abstract "Abstract Subduction megathrust earthquakes occur at the interface between the subducting and overriding plates. These hazardous phenomena are only partially understood because of the absence of direct observations, the restriction of the instrumental seismic record to the past century, and the limited resolution/completeness of historical to geological archives. To overcome these restrictions, modeling has become a key‐tool to study megathrust earthquakes. We present a novel model to investigate the seismic cycle at subduction thrusts using complementary analog (paper 1) and numerical (paper 2) approaches. Here we introduce a simple scaled gelatin‐on‐sandpaper setup including realistic tectonic loading, spontaneous rupture nucleation, and viscoelastic response of the lithosphere. Particle image velocimetry allows to derive model deformation and earthquake source parameters. Analog earthquakes are characterized by “quasi‐periodic” recurrence. Consistent with elastic theory, the interseismic stage shows rearward motion, subsidence in the outer wedge and uplift of the “coastal area” as a response of locked plate interface at shallow depth. The coseismic stage exhibits order of magnitude higher velocities and reversal of the interseismic deformation pattern in the seaward direction, subsidence of the coastal area, and uplift in the outer wedge. Like natural earthquakes, analog earthquakes generally nucleate in the deeper portion of the rupture area and preferentially propagate upward in a crack‐like fashion. Scaled rupture width‐slip proportionality and seismic moment‐duration scaling verifies dynamic similarities with earthquakes. Experimental repeatability is statistically verified. Comparing analog results with natural observations, we conclude that this technique is suitable for investigating the parameter space influencing the subduction interplate seismic cycle." @default.
- W1907970824 created "2016-06-24" @default.
- W1907970824 creator A5002771136 @default.
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- W1907970824 creator A5085030476 @default.
- W1907970824 creator A5085458952 @default.
- W1907970824 creator A5085764459 @default.
- W1907970824 date "2013-04-01" @default.
- W1907970824 modified "2023-10-18" @default.
- W1907970824 title "The seismic cycle at subduction thrusts: 1. Insights from laboratory models" @default.
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