by Paul G. Somerville, Hong Kie Thio and Gene Ichinose
Somerville, Paul G., Hong Kie Thio and Gene Ichinose (2005). Ground Motions of the Sumatra Earthquakes of 2004 and 2005. SMIP05
Seminar on Utilization of Strong-Motion Data, p. 107 - 114.
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The Sumatra earthquakes of December 26, 2004 (Mw 9.15) and March 28, 2005 (Mw 8.7) are the largest subduction earthquakes that have ever been
recorded on modern digital instruments. Both earthquakes were caused by the subduction of the IndiaAustralia plate beneath the Eurasian Plate.
Although these earthquakes were not recorded on scale at close distances, they were recorded at regional distances. These regional recordings
shown strong spatial variations in amplitude and duration that are consistent with rupture directivity effects. The duration of ground motion
of the December event to the north in Thailand was about 600 seconds, while the duration in other directions, including Sumatra, was about