Volcanic Alert Level lowered to Level 1 for Mt Ruapehu 

GNS reports that the moderate to high level of volcanic unrest at Mt Ruapehu is no longer present and the Volcanic Alert Level is now lowered to Volcanic Alert Level 1, minor volcanic unrest. 

The gas emissions decreased and the level of volcanic tremor has also declined. The temperature of the summit Crater Lake has declined from 46 ºC (11 May) and is now at 23ºC.

The Aviation Colour Code is also changed, going from Yellow to Green. 

A gas flight was completed yesterday and recorded the gas output at levels typical of background for Mt Ruapehu. The level of volcanic tremor which has been elevated to moderate levels has declined and shows now similar levels to what it was in the second
half of 2015. The lake temperature measured by the outlet data logger is now 23 ºC. 

After reaching a high of 46 ºC on May 11 the lake started to cool to the current value of 23 ºC. Data available at present indicates the period of elevated volcanic unrest at Mt Ruapehu is over. 

The volcanic alert level for Mt Ruapehu is now lowered Volcanic Alert Level 1 (minor volcanic unrest). The Aviation Colour Code is also changed from Yellow to Green.

GNS Science volcanologists continue to closely monitor Ruapehu through the GeoNet project.

Agnes Mazot
Duty Volcanologist

Posted by 05 July 2016 13:50:00

GNS Crater Lake cooling stops; Volcanic Alert Level remains at Level 2 

14:00 pm Tuesday 7 June 2016

Mt Ruapehu remains in a state of heightened volcanic unrest. The temperature of the summit Crater Lake has declined from 46 ºC and is now 32 ºC. Moderate levels of volcanic tremor continue. Further gas measurements and water samples were collected last week from the lake. The Volcanic Alert Level remains at Level 2 (moderate to heightened unrest). The Aviation Colour Code is also unchanged, at Yellow.
Recent visits to the volcano have confirmed the output of volcanic gas (carbon dioxide CO2, hydrogen sulphide H2S and sulphur dioxide SO2) remains elevated above background levels but is declining. The lake temperature reached a high of 46 ºC on May 11 then the lake started to cool, declining to 30 ºC by June 2. Since then it has risen to the current temperature of 32 ºC. Water samples have been collected from the Crater Lake for chemical analysis. Moderate to low levels of volcanic tremor continue.
Data available at present indicates volcanic unrest continues at Mt Ruapehu. The volcanic alert level for Mt Ruapehu is Volcanic Alert Level 2 (moderate to heightened unrest). The Aviation Colour Code is Yellow.
GNS Science volcanologists continue to closely monitor Ruapehu through the GeoNet project.

Posted by 07 June 2016 15:07:00
Page 2 of 2 << < 1 2