A massive factor 8.6 earthquake occurred off the coast of Sumatra on Wednesday 11th April, it was closely followed by an 8.2 magnitude aftershock.
But unlike the Tsunami that caused the Boxing Day Tsunami in 2004 (M9.1); this earthquake and its aftershocks, caused little more than a large swell.
Why might this be?
why wasn't there a large displacement of water as a result of this earthquake?
What other effects were there?
Read more here:
http://www.guardian.co.uk/world/2012/apr/11/earthquake-sumatra-geology-tsunami
http://www.bbc.co.uk/news/science-environment-17680152
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