A long strip within the Tuscarora deep forms the largest continuous area with a depth greater than 4000 fathoms. All the rest of the western Pacific is a region of quite irregular contour.
A war with the Tuscarora Indians, in 1711-1713, resulted in the defeat of the Indians and the removal of the greater part of the tribe to New York, where they became the sixth nation of the Iroquois confederacy.
There the bottom slopes very abruptly, descending precipitously at a point not far from the north-east coast of the main island, where soundings have shown 4655 fathoms. This, the deepest sea-bed in the world, is called the Tuscarora Deep, after the name of the United States man-of-war which made the survey.
Apparent proof has been obtained that the shocks occurring in the Pacific districts originate at the bottom of the sea the Tuscarora Deep is supposed to be the centre of seismic activity and they are accompanied in most cases by tidal waves.