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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sangay - plume of agz and ash from 19.10.2022 / 9:24 p.m. - Webcam IGEPN

Sangay - plume of agz and ash from 19.10.2022 / 9:24 p.m. - Webcam IGEPN

Activity in Sangay, Ecuador, remains high, unchanged.

The IGEPN noted between 19.10 and 20.10 at 11 a.m.: 289 explosion earthquakes, 71 episodes of emission tremor, an earthquake associated with a lahar, caused by remobilization of ashes by heavy rains.

On October 19, several steam and ash emissions were observed at heights up to 1000 m in a northwesterly direction. Three ash emission reports were issued by the Washington VAAC, with a maximum height of 2070 m above crater level with a northwesterly direction.
Neither FIRMS nor MIROVA register thermal alerts in the last 24 hours.
Mounts Poject reported 363.2 tonnes of sulfur dioxide for yesterday at 7:19 p.m. UTC.

During yesterday night, an incandescence was observed in the crater with a descent of this incandescent material along the southeastern flank.

Alert level is Amarilla

 

Source: IGEPN

Taal - activity summary as of 21.10.2022 / 05:00 - Doc. Phivolcs

Taal - activity summary as of 21.10.2022 / 05:00 - Doc. Phivolcs

A total of nineteen (19) very weak phreatomagmatic bursts were detected by remote camera monitoring of Taal's main crater between 8:50 a.m. and 1:30 p.m. today, October 21, 2022, all emanating from a vent on its north- is. Some of these events produced steam-rich plumes 200 meters high, including a few emanating from very short black ash plumes that immediately collapsed into Main Crater Lake (MCL).

Many bursts were masked by the continued upwelling of hot volcanic gases in the MCL, while not all events generated detectable signals in seismic and infrasound recordings.

Currently, Taal MCL has an acidity of pH 0.76 and temperatures reaching 65.1 ºC based on measurements from October 12, 2022. SO2 flux averaged 6,702 tons/day yesterday, October 20, 2022.

 

DOST-PHIVOLCS reminds the public that Alert Level 1 prevails over Taal Volcano, which means it is still in an abnormal state and should not be interpreted as having ceased unrest or ceased the threat of eruptive activity. .

 

Source: TAAL VOLCANO ADVISORY 21 October 2022 2:00 p.m. local

Gunung Ibu - ash and gas plume from 2022-10-21 / 09:23 WIT - PVMBG / Magma Indonesia webcam

Gunung Ibu - ash and gas plume from 2022-10-21 / 09:23 WIT - PVMBG / Magma Indonesia webcam

Gunung Ibu experienced an eruptive episode on Friday October 21, 2022 at 09:16 WIT with the height of the ash column observed at ± 800 m above the peak (± 2125 m above sea level). It is observed that the ash column is gray in color with a thick intensity towards the northwest. This eruption was recorded on a seismograph with a maximum amplitude of 28 mm and a duration of 70 seconds.

 

Source: PVMBG, Magma Indonesia, VAAC Darwin

Mauna Loa - HVO personnel replace gas monitoring station at Sulfur Cone - photo HVO-USGS

Mauna Loa - HVO personnel replace gas monitoring station at Sulfur Cone - photo HVO-USGS

Mauna Loa is not erupting and there are no signs of an imminent eruption at this time. However, Mauna Loa continues to be in a state of heightened unrest, as indicated by increased seismic activity and summit inflation.

In the past 24 hours, HVO has detected 46 low-magnitude earthquakes (below M3.0) 3–5 km away. below the caldera of Mokuāʻweoweo and 6-8 km below the high altitude. northwest flank of Mauna Loa. Both of these regions have historically been seismically active during times of unrest on Mauna Loa.

Sulfur dioxide, hydrogen sulfide, and carbon dioxide concentrations, as well as fumarole temperatures, remain stable at the summit and at Sulfur Cone in the upper Southwest Rift.
Global Positioning System (GPS) instruments atop and on the flanks of Mauna Loa have continued to measure inflation at high rates since mid-September.

Location of Mauna Loa earthquakes - Doc. NPS/USGS 18.10.2022 via Philip Ong

Location of Mauna Loa earthquakes - Doc. NPS/USGS 18.10.2022 via Philip Ong

Heightened unrest began in mid-September 2022 with an increase in earthquake rates below Mauna Loa's summit (from 10-20 per day to 40-50 per day), an increase in the rate of inflation recorded by GPS stations and inflation recorded on the MOK inclinometer. The unrest is likely caused by a new influx of magma into Mauna Loa's summit reservoir system. As the reservoir expands, it triggers small earthquakes directly below the Mokuāʻweoweo caldera and in an area just northwest of the caldera.

Deeper magma entry (greater than 2 miles, 3 kilometers) is detected by the continued increase in upward motion and extension measured between GPS stations on the ground surface. Shallower magma inflow (less than 2 miles, 3 kilometers) was likely responsible for the inflation recorded on the summit tiltmeter during the last two weeks of September. The current locations of earthquakes and deformations do not necessarily mean that the next eruption will occur there.

Mauna Loa remains at a high alert level: Advisory / Yellow.

 

Source: HVO

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