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Hunga Tonga-Hunga Ha’apai eruption images 19 March 2009

Posted by admin in eruptions, Pacific, submarine volcanism, Tonga.
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A Japanese reader of The Volcanism Blog has sent in the following images of the Hunga Tonga-Hunga Ha’apai eruption, captured from a video taken on 18 March 2009.

Hunga Tonga-Hunga Ha'apai eruption, 18 March 2009

Hunga Tonga-Hunga Ha'apai eruption, 18 March 2009

Hunga Tonga-Hunga Ha'apai eruption, 18 March 2009

Hunga Tonga-Hunga Ha'apai eruption, 18 March 2009

Hunga Tonga-Hunga Ha'apai eruption, 18 March 2009

Hunga Tonga-Hunga Ha'apai eruption, 18 March 2009

These images clearly show that there are two active vents. The white plume consists mainly of steam, the dark masses are dark pyroclastic material projected violently upwards as water enters the magmatic vents, creating powerful phreatic explosions. The ragged-edged effect visible on the dark clouds is caused by larger fragments of ejected material following parabolic curves as they are hurled upwards and outwards, trailing smaller fragments behind them.

UPDATE: The video from which these images are clearly taken has turned up on the BBC News website: Underwater volcano erupts off Tonga. At the end of the video, around the point from which the final image reproduced above comes, voices can be heard off-camera saying ‘I think we should run away’, and ‘turn the boat around’.

For all our coverage of the Tonga eruption: Tonga « The Volcanism Blog.

Information
Global Volcanism Program: Hunga Tonga-Hunga Ha’apai – summary information about Hunga Tonga-Hunga Ha’apai (0403-04=)
Tonga volcanoes and volcanics – overview from the USGS

The Volcanism Blog

Comments

1. iusini borgnolo - 24 March 2009

this is just as extraordinary as any other eruption in this world and yet we don’t get any major coverage on major news channels. If it was in the US or any other big cities, it would be live 24/7. Please don’t overlooked these ‘small’ things, we make this world alot more interesting than money and wars you’re all involved in.

2. iusini borgnolo - 24 March 2009

p.s i’m a Tongan living in Ireland!


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