Osbourn Seamount

Osbourn Seamount is the oldest seamount of the Louisville Ridge, with an estimated age of 77.3 million years. It lies at the westernmost end of the chain and its flat-topped summit is strewn with fault lines. Like other seamounts comprising the Louisville Ridge, it was formed by the Louisville hotspot.

Map of Osbourn Seamount

Osbourn Seamount will eventually be destroyed by subduction by the Tonga and Kermadec trenches once it is carried into the trenches by the ongoing plate motion, although this will not fully occur for several million more years if the current rate of motion is maintained.