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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

A small explosion occurred this June 1 at 10:32 am AKST at the Cleveland volcano in the Aleutians; it was detected by the infrasonic surveillance network, the local surveillance stations being offline

It was accompanied by a small plume of ash observed at more than 6,000 meters asl. drifting south. Aviation code is orange

 

Source: AVO / Alaska volcano Observatory

Cleveland - Clear Worldview-3 satellite image of the summit crater and lava dome, April 30, 2020 - Digital Globe image via NextView License / Matt Loewen / in AVO

Cleveland - Clear Worldview-3 satellite image of the summit crater and lava dome, April 30, 2020 - Digital Globe image via NextView License / Matt Loewen / in AVO

Two eruptive episodes marked Rincon de La Vieja in Costa Rica on June 1st.

The first, at 5 p.m., produced a plume reaching 1,500 to 2,000 meters above the summit; for the second at 5:45 pm, the height of the plume was 2,000 meters, and the duration of one minute. No ash fall or sulfur odor was associated with these eruptions.

On June 2, from 5 to 7.15 am, activity was constant. It continues with a beautiful white plume emitted at 3:47 p.m. local time.

The volcanologist Javier Pacheco specifies that an overview of the volcano is necessary to check the changes to the crater. Day after day, the conduits open and the activity of the volcano changes, with an increase in daily events.

 

Sources: Ovsicori and interview in Nacion

 Rincon de la Vieja - hydrothermal eruption of 01.06.2020 / 1705 - Doc. Ovsicori video clip

Rincon de la Vieja - hydrothermal eruption of 01.06.2020 / 1705 - Doc. Ovsicori video clip

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano remains at moderate levels, with the continuous recording of 14 explosions per day on average, with plumes up to 2 km in height on the summit of the volcano, and consequent emissions of ash and gas, dispersed towards the east and southeast sectors of the volcano.

The IGP recorded and analyzed the occurrence of approximately 414 earthquakes of volcanic origin, associated with the circulation of fluids (magma, gas, etc.) within the volcano

The monitoring of the deformation of the volcanic structure, using GNSS data (processed with fast orbits), does not present any significant anomalies; however, since May 23, there has been slight inflation of the southeast flank and the northern sector of Sabancaya, probably related to the eruptive activity of the volcano.

Satellite surveillance has identified the presence of 8 thermal anomalies of values ​​between 2 MW and 15 MW, associated with the presence of a body of lava on the surface of the crater of the volcano.

The level of volcanic alert remains orange, with prohibition to approach within a radius less than 12 km from the crater.

 

Source / I.G. Peru

Sabancaya - summary of the activity between 25 and 31 May 2020 - Doc. I.G.Peru

Sabancaya - summary of the activity between 25 and 31 May 2020 - Doc. I.G.Peru

A particularly calm month of May 2020 in Piton de la Fournaise with the end of inflation, low seismicity, with less than one earthquake per day recorded under the summit craters and a decrease in the flow of CO2 into the soil in the field distant.

Piton de La Fournaise: Comparison between the normalized means of CO2 flux data in the soil, raw (averaged over a 15-day sliding window, in green) and corrected (in black), recorded at stations located in the far field from October 2016 (date of installation of the last station). Eruptive periods are shown in red and intrusive periods in gray (© OVPF-IPGP).

Piton de La Fournaise: Comparison between the normalized means of CO2 flux data in the soil, raw (averaged over a 15-day sliding window, in green) and corrected (in black), recorded at stations located in the far field from October 2016 (date of installation of the last station). Eruptive periods are shown in red and intrusive periods in gray (© OVPF-IPGP).

The replenishment of magma and the pressurization of the surface magmatic reservoir which had resumed following the end of the eruption of 2-6 April ceased at the end of April.

Note that since 2016, the replenishments of the surface magmatic reservoir under the Piton de la Fournaise have been carried out by impulses, so such phases of lull in deformations and seismicity have already been observed several times between 2016 and 2019 over periods ranging from about 15 to 80 days.

The alert level is vigilance

 

Source: OVPF

Piton de La Fournaise - Illustration of the deformation over 2 months, between April 2 and June 2, 2020. Here are represented the baselines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at top (top), at the base of the terminal cone (in the middle) and in the far field (bottom) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF-IPGP

Piton de La Fournaise - Illustration of the deformation over 2 months, between April 2 and June 2, 2020. Here are represented the baselines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at top (top), at the base of the terminal cone (in the middle) and in the far field (bottom) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF-IPGP

During the month of May at Yellowstone, the Steamboat geyser experienced no less than 5 watery eruptions, on May 8, 14, 19, 23 and 31. This brings the total number of eruptions for the year 2020 to 17.

In the very dynamic report by Mike Poland, volcanologist in charge (in English, but easily affordable thanks to subtitling), he also tells you about the overall style and rate of deformation in Yellowstone, which have remained unchanged since the last update.  Subsidence for the Yellowstone caldera, ongoing since 2015, continues at an average rate of 2 to 3 cm (about 1 inch) per year. In the Norris Geyser basin area, few deformations have been detected by a nearby GPS station since early 2020.

In May 2020, the University of Utah seismographic stations, responsible for operating and analyzing the Yellowstone seismic network, located 288 earthquakes in the Yellowstone National Park area. Such sequences of earthquakes are common; Yellowstone's seismic activity remains at the bottom level.

The volcanic alert level is Normal, and the aviation code green.

 

Source: Yellowstone volcano Observatory

Yellowstone Volcano Observatory Monthly Update: June 1, 2020 - by Mike Poland , volcanologist in charge.

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