Thursday, September 13, 2018

Revisiting Australian volcanoes

There was a recent article at The Conversation about the active volcano field that runs across Victoria and South Australia.   ("Active" in the sense that the last eruption was only 5,000 years ago, at Mt Gambier, and we could apparently get another any time.)

One of the authors had an earlier post in 2016 on much the same topic, in which he explains:
So what can we expect the next volcanic eruption to be like? It depends where it happens.

If the next eruption occurs in the northern areas of the Newer Volcanics Provinces (around Bendigo, Ballarat or Hamilton), we can expect lots of lava flows and fire fountains.

But if it occurs in the southern part (Colac, Camperdown, Warrnambool or Mt Gambier), the presence of groundwater could make it much more explosive.

We could be up for an eruption just like the 2010 Iceland eruption where a big plume of ash was sent high in the atmosphere. In this case disruption will occur in Eastern Australia and New Zealand.

Will it happen any time soon? Well, the Newer Volcanics Province has been active for more than 4.5 million years, with eruptions occurring at least once every 10,000 years.

It could happen in our lifetime, but more likely it will happen after that.

Oh, another outcome of the research was that the first warning signs with Mt Gambier would have been noticed only by the most sensitive equipment up to two days in advance.

Such equipment is not present in the area at the moment.
I see that in 2011 I had a post on the same topic, with a Professor suggesting it might be a good idea for local governments to think about what to do if a volcano suddenly emerges.

But gee - with only a couple of days notice, what could they do anyway?

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