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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
Gunung Ibu - 28.10.2022 / 1:16 p.m. local time - PVMBG Magma Indonesia webcam

Gunung Ibu - 28.10.2022 / 1:16 p.m. local time - PVMBG Magma Indonesia webcam

Gunung Ibu activity continues with an eruptive episode on Friday October 28, 2022 at 1:19 p.m. WIT. The height of the eruption column was observed at ± 800 m above the peak. The eruption was recorded on a seismograph with a maximum amplitude of 30 mm and a duration of 75 seconds.

 

Source: PVMBG, Magma Indonesia

Mauna Loa - photo USGS 05.10.2022

Mauna Loa - photo USGS 05.10.2022

The USGS graph shows earthquake rates over the past month at Mauna Loa. The number of earthquakes per day over the past month is indicated by the blue bars. The red line is the cumulative moment (energy) released. Data shows that there were more earthquakes per day in late September/early October compared to late October.

The USGS graph shows earthquake rates over the past month at Mauna Loa. The number of earthquakes per day over the past month is indicated by the blue bars. The red line is the cumulative moment (energy) released. Data shows that there were more earthquakes per day in late September/early October compared to late October.

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. The current unrest is most likely due to a new supply of magma from 3 to 8 km below the summit of Mauna Loa. Monitoring data shows no significant changes over the past day.

In the past 24 hours, HVO has detected 19 low magnitude earthquakes (below M3.0) 2–3 miles (2–5 km) below the Mokuʻāweoweo caldera and 4–5 miles (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.

Global Positioning System (GPS) instruments atop and on the flanks of Mauna Loa have continued to measure inflation at high rates since mid-September. However, summit tiltmeters show no significant surface deformation over the past week.

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. Webcam and thermal camera views showed no change in the volcanic landscape of Mauna Loa over the past week.

"Mauna Loa continues to be in a state of heightened unrest," HVO chief scientist Ken Hon said in the observatory's latest report on the active volcano. However, Hon noted, "the current increase in activity does not suggest that progression to an eruption is certain."

HCDA posted daily snapshots via social media of Mauna Loa activity, based on HVO data, including the current alert level (as of 27.10.2022; Advisory/yellow), status and a summary of activity over the past 24 hours.

 

Sources: HVO & Big island video news

Cotopaxi - overview of 27.10.2022 by FAE - - via Th.Toulkeridis

Cotopaxi - overview of 27.10.2022 by FAE - - via Th.Toulkeridis

Flyover of Cotopaxi by the FAE on 26-27.10.2022 - rare zenith view of the nested craters and the current plume of gas and vapor - via Th.Toulkeridis

Flyover of Cotopaxi by the FAE on 26-27.10.2022 - rare zenith view of the nested craters and the current plume of gas and vapor - via Th.Toulkeridis

On October 26 and 27, IG-EPN staff conducted two reconnaissance flights around the Cotopaxi volcano. These overflights were carried out thanks to the support of the Armed Forces, the Presidency, the Ministry of Defense, the Secretariat for Communication of the Presidency and the National Service for Risk and Emergency Management

During these overflights, thermal images were taken using a portable infrared camera, CO2, SOand H2S measurements using MultiGAS equipment and observations using conventional visual cameras. : the apparent temperature of the gas emission has reached a value > 50°C. In addition, it was found that temperatures in the crater area remain at levels similar to those measured on previous occasions.

 

Cotopaxi - thermal image on 27.10.2022 - S.Vallejo via IGEPN

 

The multiGAS equipment made it possible to measure the concentrations of CO2, SO2 and H2S in the volcanic gas plume. The SO2/H2S ratios are around 4, while the CO2/SO2 ratios are between 2 and 3, being slightly higher than those obtained in 2015 during the last eruption of the volcano. These values ​​indicate a mainly magmatic origin for the gas emitted by the Cotopaxi volcano.

The emission of water vapor and other volcanic gases, is displayed continuously in recent days, indicating an increase compared to what has been observed in previous months.

 

Source: IGEPN

La Palma - Tajogaite - measurements of gaseous emanations after eruption - photo Ruben Lopez - IGNes 27.10.2022

La Palma - Tajogaite - measurements of gaseous emanations after eruption - photo Ruben Lopez - IGNes 27.10.2022

The data obtained by the geochemical monitoring networks deployed in La Palma confirm that the strong emission of carbon dioxide persists in the areas of Puerto Naos and La Bombilla after the end of the Tajogaite eruption, with CO2 concentrations of 50,000 ppm (maximum limit of the measuring equipment) and 19.4% and 15.3% oxygen, respectively, values ​​lower than the normal value established at 20.9%.

 

Source: IGN.es & R.Lopez

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