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

 


White Island unrest increases, Aviation Colour Code changed

Volcano - GeoNet
Volcanic Alert Bulletin WI-2013/3 - White Island Volcano

24 January 2013, 4:00pm - Volcanic unrest increases, Aviation Colour Code changed to Orange.

Over the last 20-30 hours the style of seismic activity at White Island has changed. The level of volcanic tremor has started to decrease, but hybrid volcanic earthquakes have appeared. Hybrid earthquakes are typically associated with the movement of molten material (magma) within an active volcano. This change in activity is consistent with an increase in the level of unrest; hence the Aviation Colour Code has been lifted to Orange.

The current episode of activity started in August 2012 (explosions and ash emission) followed in November 2012 by extrusion of a small lava dome. Elevated but not high unrest followed. However, volcanic unrest has been increasing at White Island since about January 14. This unrest has been manifested as increased hydrothermal activity in the ‘hot lake’ and has been described as some of the most vigorous activity seen at White Island for many years.

GNS volcanologist Gill Jolly commented “Visitors to White Island are now at the highest level of risk since the start of the 2012 eruptions. Hazards to visitors can include the health effects of volcanic gas exposure, including respiratory issues, skin and eye sensitivity to acid gases. Explosive eruptions can occur at any time with little or no warning. We advise a high level of caution should be taken, if visiting the island”.

The outcomes of the unrest could be either the passive intrusion of magma to shallow depths with no changes in surface activity, more dome building as in November 2012 or explosive eruptions and ash emissions, like in August 2012.

The state of unrest at White Island is increasing and future eruptions are possible with little or no warning. The increased level of unrest does mean that there is an increased hazard to visitors. GNS Science continues to closely monitor White Island through the GeoNet project.

Weather permitting a ‘gas flight’ will be made tomorrow morning to ascertain if there have been any changes in the gas flux from the volcano.

Background

Hybrid volcanic earthquakes are so called because they are a mix of rock fracturing and magmatic vibration. They are thought to represent the movement of magma in a volcano.

Aviation Colour Codes are based on four colours and are intended for quick reference only in the international civil aviation community.

The Volcanic Alert Level ranges from 0 to 5 and defines the current status at a volcano. Level 1 indicates signs of volcanic unrest.

The GeoNet project is funded by EQC and provides monitoring for all of New Zealand’s volcanoes.

ENDS


© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Sky City : Auckland Convention Centre Cost Jumps By A Fifth

SkyCity Entertainment Group, the casino and hotel operator, is in talks with the government on how to fund the increased cost of as much as $130 million to build an international convention centre in downtown Auckland, with further gambling concessions ruled out. The Auckland-based company has increased its estimate to build the centre to between $470 million and $530 million as the construction boom across the country drives up building costs and design changes add to the bill.
More>>

ALSO:

RMTU: Mediation Between Lyttelton Port And Union Fails

The Rail and Maritime Union (RMTU) has opted to continue its overtime ban indefinitely after mediation with the Lyttelton Port of Christchurch (LPC) failed to progress collective bargaining. More>>

Earlier:

Science Policy: Callaghan, NSC Funding Knocked In Submissions

Callaghan Innovation, which was last year allocated a budget of $566 million over four years to dish out research and development grants, and the National Science Challenges attracted criticism in submissions on the government’s draft national statement of science investment, with science funding largely seen as too fragmented. More>>

ALSO:

Scoop Business: Spark, Voda And Telstra To Lay New Trans-Tasman Cable

Spark New Zealand and Vodafone, New Zealand’s two dominant telecommunications providers, in partnership with Australian provider Telstra, will spend US$70 million building a trans-Tasman submarine cable to bolster broadband traffic between the neighbouring countries and the rest of the world. More>>

ALSO:

More:

Statistics: Current Account Deficit Widens

New Zealand's annual current account deficit was $6.1 billion (2.6 percent of GDP) for the year ended September 2014. This compares with a deficit of $5.8 billion (2.5 percent of GDP) for the year ended June 2014. More>>

ALSO:

Still In The Red: NZ Govt Shunts Out Surplus To 2016

The New Zealand government has pushed out its targeted return to surplus for a year as falling dairy prices and a low inflation environment has kept a lid on its rising tax take, but is still dangling a possible tax cut in 2017, the next election year and promising to try and achieve the surplus pledge on which it campaigned for election in September. More>>

ALSO:

Job Insecurity: Time For Jobs That Count In The Meat Industry

“Meat Workers face it all”, says Graham Cooke, Meat Workers Union National Secretary. “Seasonal work, dangerous jobs, casual and zero hours contracts, and increasing pressure on workers to join non-union individual agreements. More>>

ALSO:

Get More From Scoop

 
 
Standards New Zealand

Standards New Zealand
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news