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This plot shows the accelerations observed at IRIS/IDA stations COCO (Cocos Keeling Island) and PALK (Pallekele, Sri Lanka) during the 12/26/04 Sumatran earthquake superimposed on a figure depicting expected ground accelerations for varying distances and sizes of earthquake. These stations, the closest operational GSN stations to the earthquake, were located between regional and teleseismic distance.
Credit: Peter Davis and Jon Berger, University of California, San Diego