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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

Etna's activity was characterized between 1 ° and May 7, 2020 by a continuous degassing of the BN / VOR / NEC crater sectors (Bocca Nuova, Voragine, NE crater) and SEC / NSEC crater (SE crater and new SE crater). Explosions continue from the easternmost slag cone inside Voragine. This activity is often violent with the projection into the atmosphere of coarse pyroclastic fragments. Strombolian activity continues at the bottom of the northeast crater.

Since around 5:00 p.m. on May 8, there has been a slight increase in ash emissions from the NSEC, this pulsating activity has formed a plume of diluted ash towards the ESS. INGV personnel present near the new southeast crater observed a strong degassing, with deep roars and associated ash emissions. As for the amplitude of the volcanic tremor, it oscillates on medium-high values; the source of the tremor is located near the new southeast crater, at a depth of about 2,800 to 3,000 meters above mean sea level.

Etna NSEC & VOR - white plume and black plume ... what will be the good news? - photo Salvatore lo Giudice

Etna NSEC & VOR - white plume and black plume ... what will be the good news? - photo Salvatore lo Giudice

The infrasonic activity was maintained at generally average values ​​(<1 Pa) with periodic, short-term increases (<12h) characterized by high amplitude events (> 1 Pa) localized both in the BN / VOR / NE crater and that of SE / NSE. On May 3, the earthquake went from average to low values.

Analysis of the thermal activity of the MODIS satellite revealed a thermal peak anomaly of a mainly moderate intensity (max 23 MW), depending on an explosive activity, as recorded by the remaining monitored parameters.

 

Sources: INGV vulcani and L.G.S.

Stromboli - seismicity and infrasonic ratio between 1 ° and 7 May 2020 - Doc. LGS

Stromboli - seismicity and infrasonic ratio between 1 ° and 7 May 2020 - Doc. LGS

In Stromboli, during the week of May 1 to May 7, 2020, the explosive activity remained stable at a low level and was mainly localized in the SW crater until May 1, then decreased slightly and mainly moved towards the central crater. This activity is accompanied by a slight swelling (max 40 mbar) also located in the C-SO sector.

The number of VLP events stable at high values ​​until May 5 then increased to average values ​​(between 10.5 and 10.9 events / hour). The seismic tremor is stable on the average values.

The thermal anomalies of the satellites (MODIS) detected anomalies of low to moderate level (max 22 MW), consistently with a low level of explosive activity.

SO2 fluxes, measured during the week, oscillate between low and average values, recording average values ​​of 61 tonnes / day and 408 tonnes / day respectively.

On May 6, following the comparative analysis of the monitored parameters, the global evaluation of volcanic activity went to low level.

 

Source: L.G.S.

Rincon de La Vieja - photo archive 10.2019 by Edgardo Delgado / Twitter

Rincon de La Vieja - photo archive 10.2019 by Edgardo Delgado / Twitter

At Rincon de La Vieja, a last hydrothermal explosion occurred on May 8 at 3:43 am local; due to the cloud cover in the crater, the height of the plume remains unknown.

The Ovsicori reports tremor in bands in the range of 1 to 5 Hz, sometimes discontinuous.

The activity level is 3 out of 5 /

 

Source: Ovsicori

Steamboat geyser - the 13th eruption, right on the Tantalus gauge / Norris junction YNP

Steamboat geyser - the 13th eruption, right on the Tantalus gauge / Norris junction YNP

At Yellowstone National Park, the Steamboat geyser experienced its 13th eruption in 2020 on May 8 at 1:05 a.m. MDT. The nearest seismic and temperature sensors were offline due to a power failure, but the event was detected by another seismometer and the Tantalus Creek gauge.

 

Source: USGS volcanoes

Clarification on the Sakurajima eruption of yesterday May 8, 2020 - possible pyroclastic flow in the direction of Kagoshima bay

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