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:
NZ Puts Seven New Oil And Gas Areas Put Up For Tender

A total of seven new areas will be opened up to oil and gas exploration under its block offer tendering system, as the New Zealand government seeks to concentrate activity in a few strategically chosen areas. More>>

ALSO:

Half Full: Dairy Payouts Steady, Cash Will Be Tight

Industry body DairyNZ is advising farmers to focus on strong cashflow management as they look ahead to the 2015-16 season following Fonterra's half-year results announcement today. More>>

ALSO:

First Union: Cotton On Plans To Use “Tea Break” Law

“The Prime Minister reassured New Zealanders that ‘post the passing of this law, will you all of a sudden find thousands of workers who are denied having a tea break? The answer is absolutely not’... Cotton On is proposing to remove tea and meal breaks for workers in its safety sensitive distribution centre. How long before other major chains try and follow suit?” More>>

ALSO:

Scoop Business: NZ-Korea FTA Signed Amid Spying, Lost Sovereignty Claims

A long-awaited free trade agreement between New Zealand and South Korea has been signed in Seoul by Prime Minister John Key and the Korean president, Park Geun-hye. More>>

ALSO:

PM Visit: NZ And Viet Nam Agree Ambitious Trade Target

New Zealand and Viet Nam have agreed an ambitious target of doubling two-way goods and service trade to around $2.2 billion by 2020, Prime Minister John Key has announced. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news