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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
Rincon de La Vieja - 04.24.2020 / 10.25 a.m. - photo Teresa Lopez / Ovsicori

Rincon de La Vieja - 04.24.2020 / 10.25 a.m. - photo Teresa Lopez / Ovsicori

The Rincon de La Vieja, in Costa Rica, after the phreatic episode of April 19, presented on the evening of April 20 and on April 21 several exhalations (puffs) of gas and low-energy vapor, the main one at 6:26 local time (link)

On April 22 at 5:35 am local time, a hydrothermal eruption was signaled by the Ovsicori, accompanied by projections and a gas plume reaching 1,500 meters. The activity lasted 1 minute and did not generate any lahar.

On April 24, small eruptions / exhalations were recorded at Rincon de La Vieja, respectively at 5:38 am, 6:40 am, 7:52 am and 10:20 am local. The stronger hydrothermal eruption at 10:20 is characterized by a column of water and solid materials reaching up to 300 meters above the edge of the crater and a plume of vapor up to a height of 1,000 meters. New lahars are reported.

 Rincon de La Vieja - black glassy fragments of less than 1 millimeter which are drops of solidified fresh magma - Via M.Martinez / Ovsicori

 Rincon de La Vieja - black glassy fragments of less than 1 millimeter which are drops of solidified fresh magma - Via M.Martinez / Ovsicori

Maria Martinez reports that the samples of sediment ejected during eruptions dated between April 15 and April 19 contained 20% glassy black fragments of less than 1 mm which would be fresh juvenile drops of magma.

                                                     *  *  *

During a maintenance visit of the measuring devices installed at the Irazu, the Ovsicori teams noted the disappearance of the lagoon from the main crater, as well as the material falling almost continuously from the unstable edge of the crater .

 

Source: Ovsicori-UNA

Popocatépetl - 24.04.2020 / 5h07 - Doc. Mexico's Webcams

Popocatépetl - 24.04.2020 / 5h07 - Doc. Mexico's Webcams

Over the past 24 hours, using the Popocatépetl surveillance system, 215 exhalations have been identified, accompanied by volcanic gases and sometimes ash, and two explosions, one moderate and one minor, were recorded today at 4:58 am and 5:07 am respectively.

In addition, 304 minutes of tremor were recorded.

An incandescence was observed during the night during certain exhalations.

At the time of this report, there is no visibility on the crater of the volcano, any emission will be dispersed in a northeast direction.

The Popocatépetl volcanic alert remains at amarillo Fase 2.

 

Source: Cenapred

 Popocatépetl - exhalation on 24.04.2020 / 07.10 am - Doc. Mexico's Webcams

 Popocatépetl - exhalation on 24.04.2020 / 07.10 am - Doc. Mexico's Webcams

 Popocatépetl - exhalation on 24.04.2020 / 07h56 - Doc. Mexico's Webcams

 Popocatépetl - exhalation on 24.04.2020 / 07h56 - Doc. Mexico's Webcams

Very small eruptions occur intermittently in the crater of Shindake, on Kuchinoerabujima.

This April 24 at 11:15 p.m., a plume is reported 300 meters above the crater. No volcanic block collapse or pyroclastic flow was observed.

A field study from April 21-23 revealed a crack on the west side of the Shindake crater, where a slight increase in temperature in the nearby geothermal field is reported.

JMA reports an increase in activity level this April 24.

 

Source / JMA
 

Kuchinoerabujima - summit crater of Shindake, seen from the east. note the cracks - Doc. archives Narod.ru

Kuchinoerabujima - summit crater of Shindake, seen from the east. note the cracks - Doc. archives Narod.ru

The KVERT reports a moderate explosive eruptive activity at the Ebeko, with the observation of an ash plume at 2,500-2,800 meters asl. drifting east for 5 km.

Aviation code stays orange

 

Sources: KVERT & VAAC Tokyo

 Ebeko - 04.25.2020 / 06.52 am - Severo-Kurilsk City / SVERT webcam

 Ebeko - 04.25.2020 / 06.52 am - Severo-Kurilsk City / SVERT webcam

The volcanic activity of Stromboli was characterized between 17 and 23 April by Strombolian explosions rich in pyroclastic material located mainly in the NE crater and continuous degassing in the C / SW crater. This activity is associated with a high to very high number of VLP earthquakes and acoustic pressures with variable values ​​between between medium and high (max 1.08 bar).

Stromboli - seismicity and infrasonic parameters between 17 and 23.04.2020 - Doc.LGS

Stromboli - seismicity and infrasonic parameters between 17 and 23.04.2020 - Doc.LGS

The degassing (puffing) activity, mainly located in the C / SW sector of the crater terrace, was maintained between medium and low values ​​(max 60 mbar).
The signal associated with the earthquake shows a stable trend on the average values.
The SO2 and CO2 fluxes measured during the last week show values ​​that range from medium to low; while the C / S ratio remains stable at low values.
MODIS satellite thermal anomalies detected low to moderate heat flux values ​​(maximum of 26 MW on April 19), in agreement with the explosive activity recorded by the other parameters.
Analysis of the seismic signals associated with landslide activities recorded during the past week has highlighted a series of material rolling events along the Sciara del Fuoco.

The seismic network at 15:02:19 h 22/04/2020 recorded a volcanic earthquake (VT) of magnitude 2.2. This event was also recorded on the average hydrophone from Punta Labronzo placed 14 m deep. The seismic event is probably located at a depth of 2.5 km inside the volcanic structure.

The global analysis of geophysical and geochemical parameters shows during the week a constant level of volcanic activity on average values.

 

Source: LGS

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