White Island , New Zealand : slight decrease in the level of volcanic unrest .

White Island , New Zealand :  slight decrease in the level of volcanic unrest .

VOLCANIC ALERT BULLETIN: White Island Volcano
Monday 2 November 2015, 2pm

Volcanic Alert Level: Level 1 (no change)
Aviation Colour Code: Green (no change)

Recent routine monitoring of White Island (Whakaari) suggests a slight decrease in the level of volcanic unrest. In October GNS scientists had measured an increase in the amount of volcanic gas emitted at White island. The increase of emitted gas also coincided with the presence of volcanic tremor. The level of volcanic gas and tremor has declined slightly over the last week. This indicates a lower level of unrest at White Island.

GNS volcanologists who visited the Island last week measured a small drop in the temperature of the hottest fumarole (170 to 162 ºC). There was no change in the lake temperature (54 ºC). The water level of the Crater Lake was falling but no change was noticed on this visit. The DOAS SO2 gas spectrometers ranged 350 to 520 tons per day of gas during the last week.

The Volcanic Alert Level remains at Level 1 (minor volcanic unrest). The changes we are seeing presently are common for the island. Activity may continue to increase or die away. Typical volcanic unrest hazards like hot ground and gas remain. A range of activity can occur under these conditions with little or no useful warning.

November 10, 2015. White Island , New Zealand :

Source : Brad Scott , Duty volcanologue

Photo : leschroniquesderorschach.

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