White Island volcano (New Zealand): ongoing volcanic unrest, gas emissions decreased
Вт, 23 ноя 2021, 07:19 07:19 AM | АВТОР: MARTIN
The GeoNet volcano observatory did their weekly visual, gas and temperature measurement flights last week.
Summit vent area at White Island volcano (image: GeoNet)
Gas measurements revealed a decreasing trend of volcanic gases since 2 November. Sulfur dioxide (SO2) emissions decreased from 681 to 484 tonnes/day. Carbon dioxide (CO2) emissions decreased from 2712 to 1416 tonnes/day as well as hydrogen sulfide (H2S) emissions from 38 to 19 tonnes/day.
Summit vent area temperatures were measured in the range between 202 °C to 264 °C during Sep-Nov while in Jul-Aug were temperatures about 500 °C-600 °C. Temperatures between 243 °C and 264 °C were measured last week.
The crater lake level is lower than earlier this month.
Small ash emissions were observed, but the recent minor ash deposits are still occurring in the area of active vents. The effects on the ground of what is thought to have been an energetic steam-driven discharge of mud were observed around a new vent south of the main, high temperature active vent on the island.
Ongoing cloudy and humid weather conditions lead to forming vog (so-called volcanic smog) that may reach the coast.
Volcanic Alert Level remains at level 2 and the Aviation Colour Code remains at Yellow.
Source: GeoNet New Zealand volcano activity update 23 November 2021
Wed, 17 Nov 2021, 06:00
Whakaari/White Island volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 17 November-23 November 2021 (Continuing Activity)
GeoNet reported results from an 18 November overflight of Whakaari/White Island, noting a decrease in gas emissions and the lake level. Gas measurements showed that sulfur dioxide emissions had decreased from 681 tons per day recorded on 2 November to 484 tons per day. Additionally, both carbon dioxide and hydrogen sulfide decreased from 2712 to 1416 tons per day and from 38 to 19 tons per day, respectively. ... Read all
Tue, 9 Nov 2021, 02:18
The GeoNet observatory undertook visual, gas and temperature measurement flights last week as published in the latest bulletin. ... Read all