From NASA Earth: “Undersea Eruption Near Tonga”

NASA Earth Observatory

NASA Earth Observatory

acquired December 31, 2014
No Writer Credit

In late December, an undersea volcano in the Polynesian island kingdom of Tonga began erupting. About 60 kilometers (40 miles) north of Tongatapu, the two small islands of Hunga Tonga and Hunga Ha’apai sit atop a large seamount. These volcanic islands stand just 128 and 149 meters (420 and 490 feet) above sea level. The new eruption seems to be occurring just offshore of Hunga Ha’apai, though details are scarce so far.

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According to news reports, fishermen spotted signs of an eruption on December 19, and a photographer on the island of Tongatapu observed steam plumes on the horizon on December 24. Dense cloud cover prevented other remote observations for several days.


Undersea Eruption

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These natural-color images from December 29 and 31, 2014, show the waters around Tonga, Hunga Tonga, and Hunga Ha’apai, as observed on by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite. A white plume rises into the sky on both days; local news outlets said the plume extended 3 kilometers (2 miles) into the sky. The discolored water nearby suggests an underwater release of gases and rock or the disturbance of sediment by the eruption.

NASA MODIS
MODIS

NASA Terra satellite
NASA/Terra

Hunga Ha’apai is part of the Tonga-Kermadec volcanic arc and is part of the very active Pacific Ring of Fire. The last reported eruption occurred in 2009.

References
Atlas Obscura (2009) Hunga Ha’apai New Volcano Island. Accessed January 2, 2015.
Eruptions Blog, via Wired (2014, December 30) New Eruption at Hunga Tonga-Hunga Ha’apai. Accessed January 2, 2015.
Radio New Zealand (2014, December 31) Sea vent in Tonga creates 3km high steam plume. Accessed January 2, 2015.
Smithsonian Global Volcanism Program (2014, December 30) Hunga Tonga-Hunga Ha’apai. Accessed January 2, 2015.

NASA images by Jeff Schmaltz, LANCE/EOSDIS Rapid Response. Caption by Mike Carlowicz.

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