Monowai Vulcano


Monowai seamount (also known as Orion seamount) is one of the most active volcanoes of the Kermancec Arc. It has a large submarine caldera and is located halfway between Tonga and the Kermadec Islands. Eruptions at Monowai occur every few years.
Eruzioni del vulcano Monowai: 2008, 2006, 2005, 2003, 2002 (Nov), 2002 (May), 1999, 1997-98, 1997 (Apr), 1996, 1995, 1990-91, 1988, 1986, 1982, 1980, 1979, 1978, 1977 (Oct), 1977 (Apr), 1944(?)
Latest nearby earthquakes
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Background
Monowai seamount, also known as Orion seamount, rises to within 100 m of the sea surface about halfway between the Kermadec and Tonga island groups. The volcano lies at the southern end of the Tonga Ridge and is slightly offset from the Kermadec volcanoes. Small parasitic cones occur on the north and west flanks of the basaltic submarine volcano, which rises from a depth of about 1500 m and was named for one of the New Zealand Navy bathymetric survey ships that documented its morphology.A large 8.5 x 11 km wide submarine caldera with a depth of more than 1500 m lies to the NNE. Numerous eruptions from Monowai have been detected from submarine acoustic signals since it was first recognized as a volcano in 1977. A shoal that had been reported in 1944 may have been a pumice raft or water disturbance due to degassing. Surface observations have included water discoloration, vigorous gas bubbling, and areas of upwelling water, sometimes accompanied by rumbling noises.
Source: Smithsonian / GVP volcano information
Eruzioni vulcaniche significative: Monowai volcano
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Monowai Volcano FAQ
+When was the last eruption of Monowai volcano?
The last confirmed eruption of Monowai occurred in 2014.
+How often does Monowai volcano erupt?
Monowai volcano erupts almost every year. Since its first historically documented eruption 1977, Monowai has often been near-continuously active. The Global Volcanism Project counts 25 historic eruptions until now, spanning a total of 25 out of 48 years. In other words, Monowai is active roughly every one in 1.9 years on average. This value is likely an underestimate, because the known history of eruption might not contain all eruptions, especially further back in time. The last eruption of Monowai
+How active is Monowai volcano at present?
Monowai volcano is relatively active: Since 1900, it has had 25 eruptions, and been active during 25 years out of 126 as of now. This means, Monowai has been in eruption one in 5 years on average. The last eruption was in 2014 and ended 11 years ago.
+When was the largest eruption of Monowai volcano?
The largest eruption of Monowai volcano in historic times occurred in 2014. It only has a VEI (Volcanic Explosivity Index) of 1, likely because it was a mainly effusive eruption generating lava flows but very little ash.
Ultime immagini satellitari
Monowai Vulcano Mappe





















