Tuscaloosa Seamount

The Tuscaloosa Seamount is an undersea mountain in the Hawaiian archipelago. It is about 100 kilometres (62 mi) northeast of the island Oʻahu.

Tuscaloosa Seamount
Highest point
Elevation	-2765
Coordinates	22°4′0″N 157°5′0″W
Geography
Location	Pacific
Region	US-HI (Hawaii)
Geology
Rock age	1.5 to 2 ma
Mountain type	hyaloclastite

Tuscaloosa Seamount is composed of volcanic rock, but in contrast to the overwhelming majority of seamounts, it is not a submarine volcano.^[1] It is a huge block of rocks that broke off about two million years ago at the Nuʻuanu submarine landslide when the volcano Koʻolau collapsed.^[2]

The Tuscaloosa Seamount is 30 km (19 mi) long and 17 km (11 mi) wide.^[3] Its shallow summit rises 1.8 kilometres (1.1 mi) across the sea bottom but is 2,756 metres (9,042 ft) below sea level.^[4]