White Island volcano (New Zealand): cooling of vent area continues
Di, 28. Sep 2021, 01:24 01:24 AM | VON: MARTIN
The local observatory GeoNet New Zealand undertook gas, temperature and visual observations from helicopter.
Degassing activity continues from White Island volcano (image: GeoNet)
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
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