Question: What was the maximum displacement of the sea bottom above the magnitude 9.0 earthquake source off the west coast of northern Sumatra?

 Answer:

The displacement of the ground surface will be related to, but somewhat less than, the displacement on the earthquake fault at depth. In places, the block of crust beneath the sea floor and overlying the causative fault is likely to have moved on the order of 10 meters to the west-southwest and to have been uplifted by several meters

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