Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


Ruapehu 22/11/12: Likelihood of eruptions remains

Volcanic Alert Bulletin RUA-2012/02 - Ruapehu Volcano

22 November 2012, 12:00 pm - Likelihood of eruptions at Ruapehu remains; Volcanic Alert remains at Level 1; Aviation Colour Code remains Yellow

Yesterday GNS Science volcanologists visited the summit crater lake to sample the water and gas. Some provisional results should be available within a few days. GNS volcanologist Brad Scott said, “The lake remains similar to our last visit on 10 November. The lake is a uniform blue colour with very little convection and the temperature was only 19.5 °C. Everything looks quiet at the surface”.

Recent measurements at Ruapehu indicate that the likelihood of eruptions has increased and the observations yesterday don’t change this.

The Aviation Colour Code remains at Yellow and the Volcanic Alert Level remains at 1.

We are monitoring Ruapehu closely, but it often does not give any immediate warning that it is going to erupt.

Since late-October small earthquakes have been occurring about 5 km beneath the summit area of Ruapehu, but these may not be directly related to the high temperatures beneath Crater Lake as the earthquakes are much deeper.

Background

A build-up of pressure beneath Crater Lake is thought to have caused the 2007 eruption and a smaller eruption in 2006.

We think that the temperature a few hundred metres beneath Crater Lake is about 800 °C, but the lake itself is only about 19-20 °C. This suggests the vent is partly blocked which may be leading to a pressure build-up beneath Crater Lake. A sudden release of the pressure may lead to an eruption.

Aviation Colour Codes are based on four colours and are intended for quick reference only in the international civil aviation community. Code Yellow indicates that a volcano is experiencing signs of elevated unrest above known background levels.

The Volcanic Alert Level ranges from 0 to 5 and defines the current status at a volcano. Level 1 indicates a departure from typical background surface activity.

ENDS


© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Negotiations Fail: Christchurch Convention Centre Build To Proceed Without PCNZ

After protracted negotiations, the government has ditched the construction consortium it picked to build Christchurch's replacement convention centre, which it now anticipates delivering at least two years behind the original schedule. More>>

ALSO:

Ruataniwha: Greenpeace Launches Legal Challenge Against $1b Dam Plan

Greenpeace NZ is launching a legal challenge against a controversial plan to build a dam that’s set to cost close to $1 billion and will pollute a region’s rivers. More>>

ALSO:

Inequality: Top 10% Of Housholds Have Half Of Total Net Worth

The average New Zealand household was worth $289,000 in the year to June 2015, Statistics New Zealand said today. However wealth was not evenly distributed, with the top 10 percent accounting for around half of total wealth. In contrast, the bottom 40 percent held 3 percent of total wealth. More>>

ALSO:

What Winter? Temperature Records Set For June 20-22

The days around the winter soltice produced a number of notably warm tempertaures. More>>

Conservation Deal: New Kākāpō Recovery Partnership Welcomed

Conservation Minister Maggie Barry says the new kakapo recovery partnership between DOC and Meridian Energy is great news for efforts to save one of New Zealand’s most beloved birds. More>>

ALSO:

Tech Sector Report: Joyce Warns Asian Tech Investors View NZ As Hobbits And Food

Speaking in Wellington at the launch of a report showcasing the value of the technology sector to the New Zealand economy, Joyce said more had to be done to tell the country's technology stories overseas. More>>

ALSO:

Mediaglommeration: APN Gets OIO Approval For Demerger Plan

APN News & Media has received Overseas Investment Office approval for its plan to split out its NZME unit ahead of a potential merger with rival Fairfax Media's New Zealand operations. More>>

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news