Earthquakes in Sumatra are caused by the Indian plate moving into the Asian plates, which also caused the himalayas to form. if the entire region is not taken up by a fault slip during an Earthquake, then a deficit occures until the next one.This is because of the asperites along the plate boundary. But, layers of coral reefs appear where there is a major Earthquake, and if it is up or down states when an Earthquake was. so we can determine when another Earthquake comes by finding the asperity locations they may be able to make more accurate assumptions of the Earthquake time.
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