NEW : American Samoa declares major disaster ; orders federal aid . Oregon sending plane with aid , officials to help White House . Magnitude-8.0 quake strikes near Samoan Islands early Tuesday . Quake struck at depth of 5.1 feet , triggered more than 20 5-foot tsunamis .
NEW : White House declares major disaster ; orders federal aid . U.S. sending plane with aid , officials to help American Samoa . Magnitude-8.0 quake strikes near Samoan Islands early Tuesday . Quake struck at depth of 7.4 miles , triggered three 5-foot tsunamis .