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White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !

 
Anonymous Coward
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08/02/2012 06:57 AM
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White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
White Island volcano is showing signs of increased activity, GNS Science says.

The volcano, about 49 kilometres off the coast of Whakatane, is a popular tourist spot, but GNS volcanologist Michael Rosenberg says those visiting it should be cautious even though the alert level for the island had not changed.

"Eruptions can occur at any time with little or no warning. The recent changes in activity suggest that the hydrothermal system has become unstable, and as a result the risk has increased," Rosenberg said.

GNS Science has changed the volcano's code from a "normal, non eruptive state" to "experiencing signs of elevated unrest above known background levels".

The volcano's lake level quickly rose by about three to five metres sometime between Friday and Saturday last week, exposing a "vigorous" flow of gas and steam into the air, Rosenberg said.

It has risen in the past, but took much longer than the 24 hours it took to rise three to five metres on Friday and Saturday, he said.

During the past few weeks there had also been some minor volcanic tremor, including several hours on Saturday, Monday and Tuesday.

Last year and earlier this year the lake started to evaporate and exposed steam vents and two large muddy pools.

"These phenomena are typical for White Islandís activity, but are the first substantial changes to occur in the last few years," Rosenberg said.

No-one lives on the privately-owned island but flights and boat-trips to the island are common.


[link to www.stuff.co.nz]
Anonymous Coward (OP)
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08/02/2012 06:59 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
Thread: Earthquake activity, Mount Tongariro: Alert Level raised from Level 0 to Level 1; Aviation Colour Code changed to Yellow
Anonymous Coward
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08/02/2012 06:59 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
I`d love to have a business card with 'volcanologist' on it.
bushtard
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08/02/2012 07:00 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
I`d love to have a business card with 'volcanologist' on it.
bushtard
 Quoting: Anonymous Coward 20957644


cruise
Anonymous Coward (OP)
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08/02/2012 07:29 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
Forgot to mention all the strong earthquakes near White Island Volcano.
Anonymous Coward
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08/03/2012 06:19 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
bump
Anonymous Coward
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08/05/2012 07:21 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !

Aug 5 2012 - White Island update


With the weather clearing up the steam plume has been clearly visible today.

After the rapid rise in White Island's crater lake, a pulse of volcanic tremor and slightly higher gas levels in the plume, there have been few obvious changes. During the week the activity has been greater than it has been during the last couple of years, but seems to have been relatively stable. Although the volcanic tremor increased substantially during Saturday it has returned to levels similar to those during the early part of last week.

The white steam plume visible on GeoNet's White Island web cameras can sometimes also be seen from areas of the Bay of Plenty coast.

GNS volcanologists plan to visit White Island early next week to collect water and gas samples and make a ground level survey of the crater floor. These measurements will help understand what changes are taking place beneath the volcano and whether these might lead to increased surface activity.

[link to geonet.org.nz]

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Anonymous Coward
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08/06/2012 03:44 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
White Island is about to BLOW !


Volcanic Alert Bulletin WI-2012/02 - Volcano camera catches small night eruption, volcanic tremor continues; Alert Level raised to 2; Aviation Colour Code changed to Orange


[link to geonet.org.nz]
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08/06/2012 03:52 AM
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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
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Luisport

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08/12/2012 09:42 AM

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Re: White Island Volcano in New Zealand is showing signs of unrest 1 week after Tongariro !
Lahar streams from Tongariro. Heavy rain has caused a lahar - a stream of ash and mud - from Tongariro's northern slopes to close a section of Highway 46 near Lake Rotoaira, but a GNS volcanologist says this is completely in keeping with the after-effects of eruptions.

Michael Rosenberg said a member of the public had reported about 13cm of mud crossing the road around 8.30am today.

"I guess the message is it's not a volcanic triggered lahar.

"It's the kind of thing we would expect when there's a lot of ash and debris. It's a very common thing that happens on a volcano.

"This is something we expect with high rain.

"People might have seen pictures of the awesome mudflows in Indonesia on their volcanoes after their heavy tropical rain washes away the ash. This is not something unusual."

Mr Rosenburg said the lahar was nothing like the dangerous bodies of water and sludge which have thundered off Mt Ruapehu in the past. In 1953 a fatal lahar swept away the Tangiwai Rail Bridge killing 151 people travelling on the Wellington to Auckland service. In 2007 a lahar caused the crater lake to burst.
[link to www.nzherald.co.nz]





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