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

 


White Island Lava Dome Episode Over - Alert to level 1

Volcanic Alert Bulletin WI-2013/1 - White Island Volcano

7 January 2013, 2:00 pm - Lava dome eruption episode now over; Volcanic Alert changed to level 1; Aviation Colour Code changed to Yellow.

GNS Science Volcanologists today lowered the Volcanic Alert Level for White Island to level 1 and the Aviation Colour Code to Yellow. This reflects the end of the current period of eruption which involved the growth of a small lava dome in the crater.

The lava dome that was first observed in late November by tour operators has been monitored over the last 6 weeks. The most recent visit was on 1st January 2013 and this showed that the dome had not grown since previous visits on the 10th and 20th December 2012. As such we consider that the current episode of eruption to have ceased.

Lava dome temperatures measured on the 1st January were at around 200-240°C and the nearby hot lake was 70-80°C. These temperatures are similar to those made previously. GNS Science Volcanologist Nico Fournier said that “the dome looked exactly the same as it did on our previous visits. Good viewing conditions allowed us to get some remote temperature measurements using an infrared thermometer. The hot lake was really fizzing, lots of gas coming through it”

Results of airborne gas measurements from 20th December showed that White Island is emitting volcanic gases at the rate of approximately 400T/d SO2, 1300T/d CO2 and 10T/d H2S.

Seismicity continues to show elevated levels of tremor.

Observers of the GeoNet webcams may notice a slight glow in the night time images which is related to the relatively hot dome and gases.

Even though the current episode of eruptive activity is over White Island still remains in a heightened state of unrest and future eruptions are still possible with little or no warning.

GNS Science continues to closely monitor White Island through the GeoNet project.

Background

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

Aviation Colour Codes are based on four colours and are intended for quick reference only in the international civil aviation community. A reduction to Code Yellow from Orange indicates volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.

Volcanoes can erupt in many different ways. They can erupt explosively like Tongariro in 2012 when rocks and ash were hurled into the sky. They can erupt effusively with lava flows like Ngauruhoe in 1954 or in Hawaii. A lava dome is a type of effusive eruption.

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

Craig Miller
Duty Volcanologist

ENDS


© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Scoop Business: RBNZ Starts Talks On Tougher Rules For Property Speculators

The Reserve Bank of New Zealand is stepping up preparations to restrict lending to residential property investors as it watches house prices, particularly in Auckland, continue to rise strongly. More>>

ALSO:

Research: ‘Ageing Well’ Science Challenge Launched

Science and Innovation Minister Steven Joyce today launched the Ageing Well National Science Challenge, confirming initial funding of $14.6 million. More>>

ALSO:

Scoop Business: Govt Resisting Pressure To Pump More Cash Into Solid Energy

Prime Minister John Key says it is “not the government’s preferred option” to make a fresh capital injection into the troubled state-owned coal miner, Solid Energy, but dodged journalists’ questions at his weekly press conference on whether that might prove necessary... More>>

ALSO:

Lagest Ever Privacy Breach Award: NZCU Baywide Accepts “Severe” Censure In Cake Case

NZCU Baywide says that once it was found to have committed a breach of a former staff member’s privacy, it had attempted to resolve the matter... the censure and remedies for its actions taken almost three years ago are “severe” but accepted, and will hopefully draw a line under the matter. More>>

ALSO:

Scoop Business: PayPal Stops Processing Mega Payments; NZX Listing Still On

PayPal has ceased processing payments for Mega, the file storage and encryption firm looking to join the New Zealand stock market via a reverse listing of TRS Investments, amid claims it is not a legitimate cloud storage service. More>>

ALSO:

Housing Policy: Auckland Densification As Popular As Ebola, English Says

Finance Minister Bill English said calls by the Reserve Bank Governor for more densification in Auckland’s housing were “about as popular in parts of Auckland as Ebola” would be. More>>

ALSO:

Get More From Scoop

 
 
Standards New Zealand

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