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15 Cards in this Set

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coastal bulge
the region above a subduction zone in which the overlying continental plate flexes upward before slip on the subduction zone causes a major earthquake
debris avalanche
a fast-moving avalanche of loose debris that flows out a considerable distance from its source
far-field tsunami
a tsunami generated by an earthquake far from the point of impact of the wave
near-field tsunami
tsunami that strike areas adjacent to its point of origin
refract (waves)
redirection of the course of a wave passing from one medium to another (e.g. from air to water)
run-out distance
1) distance that a tsunami reaches inland
2) distance that an avalanche extends downslope
run-up height
the height to which water at the leading edge of a wave rushes up onto shore. also used for the height to which a tsunami wave rushes up onshore.
seismic sea wave
another term for tsunami
trimline
line marking erosional surface on a slope of mountainside
tsunami
an abnormally long wavelength wave most commonly produced by a sudden displacement of water in response to sudden fault movement on the seafloor.
-can also form when a landslide, volcanic eruption or asteroid impact displaces water
tsunami-laid sediments (TLS)
distinctive layers of sediment indicating the former occurrence of a tsunami
turbidity current
subaqueous flow of a plume of dense, sediment-laden water; may be initiated by a subaqueous slope failure or earthquake
wave period
the time between passage of two wave crests
3 main causes of tsunami
-seismic activity (earthquakes)
-submarine landslides
-cosmic impact
3 main types of fault movements
(also: which one causes tsunami?)
1) strike-slip
2) normal
3) thrust