Monowai Seamount Volcano

Monowai Seamount - John Seach
SW Pacific

25.88 S, 177.18 E
summit elevation -135 m
submarine volcano

Monowai seamount is located halfway between Tonga and the Kermadec Islands.
The submarine volcano is one of the most active in the Kermadec arc.
Acoustic T-wave earthquake swarms are recorded every few years at the volcano.
A long duration (6-8 minute) swarm was recorded on 24 May 2002.
Volcanic eruptions have created landslides which increased the summit depth from -65 m in 1998 to the present depth of -135 m.

A major earthquake (mag 7.8) hit 33 km west of the seamount on 9th December 2007 at 07:28 pm.
The earthquake focus was 149 km depth. No tsunami was generated.

Eruptions of Monowai Seamount
2005, 2003, 2002, 1997-98, 1997, 1996, 1995, 1990-91, 1988, 1986, 1982, 1980, 1977, 1977-79, 1944?