Here is a collection of resources for GIS data on American Samoa, the area hit by tsunami last week. GISCorps’ Shoreh Elhami said that as of yet, they have not received any requests for volunteers.
Fagatelle Bay National Marine Sanctuary
Pacific Disaster Center: http://www.pdc.org/pdf/factsheets/American_Samoa.pdf
NOAA Office of Ocean and Coastal Resource Management for American Samoa: http://coastalmanagement.noaa.gov/mystate/american_samoa.html