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New Zealand - Ruapehu Volcano: Aviation Colour Code has been returned to Green ; Alert Level remains at 1

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  • New Zealand - Ruapehu Volcano: Aviation Colour Code has been returned to Green ; Alert Level remains at 1

    Apr 5 2011 - Ruapehu Volcano

    Volcanic Alert Bulletin RUA-2011/02 - Crater Lake remains hot; Aviation Colour Code changed to Yellow; Alert Level remains at 1

    Mount Ruapehu is currently experiencing a sustained period of high water temperatures in the Crater Lake (currently about 38 - 39 C). In recent weeks changes have also occurred in volcanic gas output, seismic activity and Crater Lake water chemistry. These changes show that Ruapehu is experiencing signs of elevated unrest above known background levels, hence the Aviation Colour Code is being raised to Yellow. The Volcanic Alert Level remains at Level 1 (signs of volcanic unrest).

    The current heating cycle of the Crater Lake, which started in October 2010, has continued. The temperature of the lake peaked at 41 C on 1 March and is currently fluctuating around 38 - 39 C. Since the lake was re-established in 2002, the highest recorded temperature was 42.5 C in May 2003, and there have been eight heating cycles. The temperature of Crater Lake is a measure of the amount of volcanic heat coming from Ruapehu.

    During the current period of high lake temperatures there have also been changes in lake chemistry, increases in carbon dioxide gas emissions and minor increases in seismic activity beneath the volcano. These observations, particularly the seismic activity, have not been observed during previous periods of high lake temperature.

    These observations indicate that Ruapehu is experiencing a period of unrest above that which is typical. At times steam may be seen above Crater Lake and sediments on the lake floor may be disturbed by gas and heat flow causing the lake to change colour. However, there are currently no indications that an eruption is imminent.

    The elevated unrest is sufficient to raise the Aviation Colour Code to Yellow. This is used only by international aviation. The Volcanic Alert Level is at Level 1 and this already reflects the current state of unrest.
    GNS Science volcanologists continue to monitoring Ruapehu. Ruapehu remains an active volcano and future eruptions may occur with little or no warning.

    The Volcanic Alert Level remains at Level 1 (departure from typical background surface activity, signs of unrest). The Volcanic Aviation Colour Code is raised to Yellow (elevated unrest above the known background).

    Agnes Mazot
    GeoNet Duty Volcanologist
    For further information, please contact:
    Brad Scott
    Volcano Surveillance Coordinator
    Steve Sherburn
    Volcano Seismologist

    http://www.geonet.org.nz/volcano/ale...u-volcano.html
    "Safety and security don't just happen, they are the result of collective consensus and public investment. We owe our children, the most vulnerable citizens in our society, a life free of violence and fear."
    -Nelson Mandela

  • #2
    Ruapehu's Crater Lake heating up

    Tue, 05 Apr 2011 11:56a.m.

    Mount Ruapehu's Crater Lake is heating up, but there are no signs an eruption is imminent.

    GNS Science volcanologists said today high water temperatures, currently about 38degC-39degC, were being experienced in the lake.

    "Since the lake was re-established in 2002, the highest recorded temperature was 42.5degC in May 2003, and there have been eight heating cycles.

    "The temperature of Crater Lake is a measure of amount of volcanic heat coming from Ruapehu."

    "These observations, particularly the seismic activity, have not been observed during previous periods of high lake temperature," said Ms Mazot.
    http://www.3news.co.nz/Ruapehus-Crat...2/Default.aspx

    Comment


    • #3
      Re: Ruapehu's Crater Lake heating up

      New radar system installed at Mt Ruapehu

      The system uses a radar dish is pointed at the crater lake and will detect any explosive ash or eruption column that comes out of the volcano. It works day or night, rain or shine.

      At present only seismographs and barometers are set up to monitor the peak.

      It is the first system of its kind in New Zealand and makes Ruapehu one of the few volcanoes worldwide to be monitored in such a way....


      ...Also changes had recently occurred in volcanic gas output, seismic activity and Crater Lake water chemistry.

      "These changes show that Ruapehu is experiencing signs of elevated unrest above known background levels.
      http://www.3news.co.nz/New-radar-sys...0/Default.aspx

      Comment


      • #4
        Re: Ruapehu's Crater Lake heating up

        From Geonet site: GeoNet
        Latest temperature (9 Apr) is about 34 C so coming down....
        The only security we have is our ability to adapt."

        Comment


        • #5
          Re: New Zealand - Ruapehu Volcano: Aviation Colour Code has been returned to Green ; Alert Level remains at 1

          May 2 2011, 3:00 pm - Ruapehu Volcano

          Volcanic Alert Bulletin RUA-2011/04 - Crater Lake slowly cooling; Aviation Colour Code returns to Green; Alert Level remains at 1

          The Aviation Colour Code for Ruapehu has been returned to Green, the lowest code. The temperature of the Crater Lake has continued to decrease and is now around 30 C, down from a recent peak of 41 C in March. Other available monitored indicators also suggest a slow decrease of activity in recent weeks.

          The volcano is no longer considered in a state of elevated unrest, therefore the Aviation Colour Code has been returned to Green; the Volcanic Alert Level remains at Level 1...

          Full text:
          http://www.geonet.org.nz/volcano/ale...u-volcano.html
          "Safety and security don't just happen, they are the result of collective consensus and public investment. We owe our children, the most vulnerable citizens in our society, a life free of violence and fear."
          -Nelson Mandela

          Comment

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