Eruptions

Renewed activity at Soufriere Hills causing power problems on Montserrat

Posted by Erik Klemetti on December 2, 2009
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An ash plume from Soufriere Hills on Montserrat, taken from the ISS on October 11, 2009.

If you ever wonder what might happen to the U.S. if a large volcanic eruption, lets say from Rainier or Long Valley or Shasta, occurred, you can look at the island of Montserrat for some of the potentials problems. The renewed activity at Soufriere Hills (video link) that started in October is causing problems with the power infrastructure of the island – specifically the ash from the eruption is falling on power lines and damaging them. Ash has a minor electrical charge, so it will coat anything with a charge that attracts it, so power lines could be coated with ash very easily during a volcanic eruption. The same can be said for transfer stations and transformers – the power grid can potentially be very vulnerable to an ash-rich event. Also noted on Montserrat is disruptions caused by lightning generated by pyroclastic flows, which add another element of hazard during an eruption.

The current wind pattern has been pushing ash into “safe zones” on the island. You can get an idea of just how thick the current ash plume is from new NASA Earth Observatory images of the volcano. The plume from the dome heads off to the west, shadowing almost the entire lower third of the island.

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    Due to prevailing trade winds the plume generally blows west over the deserted ruins of Plymouth and not over the safe zone. I can send a pic or two if you like.

  2. #2 Alex Waning
    December 8, 2009

    The ashcloud was very good visible from the cockpit. We passed it on December 1 en route to Aruba at 320.000 feet and the top of the ashcloud was at 100.000 feet. It was grey/brownish.

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