Where a tectonic plate dives under another, in the so-called subduction zones at ocean margins, many strong earthquakes occur. Especially the earthquakes at shallow depths often cause tsunamis. How exactly are such earthquakes initiated? Which rock composition favours a break in the earth's interior that can lead to such natural disasters? A recent study points to earthquake nucleation in calcareous sediments.
from Oceanography News -- ScienceDaily http://ift.tt/2aqjKJE
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