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

 

Cosmetics & Pollution: Proposal To Ban Microbeads

Cosmetic products containing microbeads will be banned under a proposal announced by the Minister for the Environment today. Marine scientists have been advocating for a ban on the microplastics, which have been found to quickly enter waterways and harm marine life. More>>

ALSO:

NIWA: 2016 New Zealand’s Warmest Year On Record

Annual temperatures were above average (0.51°C to 1.20°C above the annual average) throughout the country, with very few locations observing near average temperatures (within 0.5°C of the annual average) or lower. The year 2016 was the warmest on record for New Zealand, based on NIWA’s seven-station series which begins in 1909. More>>

ALSO:

Farewell 2016: NZ Economy Flies Through 2016's Political Curveballs

Dec. 23 (BusinessDesk) - New Zealand's economy batted away some curly political curveballs of 2016 to end the year on a high note, with its twin planks of a booming construction sector and rampant tourism soon to be joined by a resurgent dairy industry. More>>

ALSO:


NZ Economy: More Growth Than Expected In 3rd Qtr

Dec. 22 (BusinessDesk) - New Zealand's economy grew at a faster pace than expected in the September quarter as a booming construction sector continued to underpin activity, spilling over into related building services, and was bolstered by tourism and transport ... More>>

  • NZ Govt - Solid growth for NZ despite fragile world economy
  • NZ Council of Trade Unions - Government needs to ensure economy raises living standards
  • KiwiRail Goes Deisel: Cans electric trains on partially electrified North Island trunkline

    Dec. 21 (BusinessDesk) – KiwiRail, the state-owned rail and freight operator, said a small fleet of electric trains on New Zealand’s North Island would be phased out over the next two years and replaced with diesel locomotives. More>>

  • KiwiRail - KiwiRail announces fleet decision on North Island line
  • Greens - Ditching electric trains massive step backwards
  • Labour - Bill English turns ‘Think Big’ into ‘Think Backwards’
  • First Union - Train drivers condemn KiwiRail’s return to “dirty diesel”
  • NZ First - KiwiRail Going Backwards for Xmas
  • NIWA: The Year's Top Science Findings

    Since 1972 NIWA has operated a Clean Air Monitoring Station at Baring Head, near Wellington... In June, Baring Head’s carbon dioxide readings officially passed 400 parts per million (ppm), a level last reached more than three million years ago. More>>

    ALSO:

    Get More From Scoop

     
     
     
     
     
     
     
     
    Sci-Tech
    Search Scoop  
     
     
    Powered by Vodafone
    NZ independent news