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One damn big problem, big enough volcanic eruption would have caused huge plume of water vapour to rise from ocean... and there might be some thick pumice floating around India ocean.
Originally posted by WyrdeOne
My fear, is that the 9.0 was an underwater volcanic eruption that might reoccur. That could explain the highly localized series of strong quakes. I mean, a trench 1000m long, 30m wide opened in the sea floor, more accurately exploded.
Originally posted by Off_The_Street
Not necessarily. Any displacement can generate a seismic sea wave (tsunami); although a tectonic shift is the usual culprit, an underwater landslide (or even an above-water one that dumps a bunch of land into the sea) can start a tsunami.
That's the big fear about a tsunami striking the United States' East Coast; a seamount collapse near, say, the Azores could (not necessarily would) generate a large tsunami indeed, and devastate the East Coast cities of both North and South America.
As an aside, that's probably the only tsunami danger the East Coast folks have, since the only Atlantic tectonic boundary of note is a divergent one, not a transform or subducting one.