earthquake frequently occcured in the volcanic and hydrothermal regeion because these regeions are cooling regeions,
through the emmision of the volcanic gas and water the molten rock lie beneath the earth crust get cooled and solidified quickly.this resulted in the formation of new low density rock layers.which then rsing upward fron the high density magma.
as the low density rock layers formed as a result of the releasing of hot gasses rising upward and as they do so,the edges of the rising rock layers rubbing with the edges of the surounding rock layers which caused the earth surface tremble.
-scientist.g.ponmudi.
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