Soft coral uplifted by an earthquake on the Sunda Megathrust, Sumatra

One of SuGAr GPS stations, in the Mentawai islands, offshore Sumatra.

This cross-section image shows the origin of the September 30, 2009 earthquake (upper green star) and an aftershock.

Using ancient corals to recover a history of earthquakes back to about AD 1300, scientists at the Observatory have identified three sites that are characterised by four earthquake "supercycles" in


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