An Earthquake Is Best Described as

The shallow 67-magnitude earthquake hit at 406 am 2109 GMT at a depth of 21 kilometres 13 miles with its epicentre 167 kilometres west of the coastal city of Pariaman the United States. Although tsunami waves are often described as waves spreading out in all directions like when you throw a pebble into a pond for long earthquake ruptures tsunami amplitudes are greater along the azimuth of tsunami beaming.

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Because the oceanic trench of subduction zones marks the orientation of inter-plate thrust the tsunami beaming azimuth is.

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