Figure 3. A geologist investigates a buried coastal wetland soil in a tidal marsh on the central Oregon coast. The buried soil (black) is overlain by tidal mud. The mud has been oxidized to a reddish color because after deposition of the mud, relative sea level fell because of transient tectonic uplift of the coastal zone as strain accumulated on the underlying megathrust on the subduction zone. During the next subduction zone earthquake, this transient tectonic uplift will be recovered as the coast coseismically subsides coincident with slip on the megathrust.
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Dec13 09
