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White Island volcano (New Zealand): cooling of vent area continues

Tue, 28 Sep 2021, 01:24
01:24 AM | BY: MARTIN
Degassing activity continues from White Island volcano (image: GeoNet)
Degassing activity continues from White Island volcano (image: GeoNet)
The local observatory GeoNet New Zealand undertook gas, temperature and visual observations from helicopter.
Sulfur dioxide (SO2) emissions increased from a 450 tonnes/day to a 680 tonnes/day in mid-August that indicates elevated fluid movements of gas, water and possibly magma under the surface.
Temperatures measured in the active vent area have decreased from 650 °C seen in July and August, to maximum 189 °C in the measurements last week as it is cited in their latest bulletin: The drop in temperatures around the vent area is interpreted to reflect the infiltration of cooler ground and geothermal water into the active vent area, caused by decreasing gas pressure around the small volume of magma (molten rock) we believed intruded earlier in the year beneath the active vents.
No ash emission was occurring during the observations made last week, however weak, intermittent ash emission is still possible.
The seismic activity is characterized by a continuous low-level volcanic tremor accompanied by occasional quakes.
Satellite based ground deformation measurements continue to show a broad region of subsidence around the active vents
Volcanic Alert Level remains at level 2 and the Aviation Colour Code remains at Yellow.
Source: GeoNet New Zealand volcano activity update 27 September 2021

Previous news

Wed, 22 Sep 2021, 06:00

Whakaari/White Island volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 22 September-28 September 2021 (Continuing Activity)

On 27 September GeoNet reported results from an overflight of Whakaari/White Island the previous week. Gas measurements showed that sulfur dioxide emissions had increased to 680 tons per day from 450 tons per day recorded in mid-August, continuing the trend of an increasing emission rate noted over the past few months. The gas data suggested magma input deeper in the system. ... Read all
Wed, 15 Sep 2021, 06:24

White Island volcano (New Zealand): intermittent weak ash emissions continue

Very fine ash particles have adhered to webcams and visibility is very limited (image: GeoNet)
The GeoNet New Zealand published that the activity at the volcano continues at reduced levels. ... Read all
Show more
White Island volcano
stratovolcano 321 m / 1,053 ft
New Zealand, -37.52°S / 177.18°E
Current status: restless (2 out of 5) White Island volcano eruptions:
2019, 2016, 2013, 2012, 2001, 1998-2000, 1998, 1995, 1986-94, 1983-84, 1976-82, 1974, 1971, 1971, 1970, 1969, 1968-69, 1966-67, 1962, 1959, 1958, 1957, 1955, 1947, 1933, 1930, 1928, 1926, 1924, 1922, 1909, 1908 (?), 1886?,1886, 1885 (?), 1885, 1856 (?), 1836, 1826
Typical eruption style
Explosive (in historic time: frequent small phreatic and phreatomagmatic eruptions)
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