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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 SEC - LAVE webcam 04.07.2021 / 5.30pm

 Etna SEC - LAVE webcam 04.07.2021 / 5.30pm

Etna still in good health!

From around 11:00 UTC, the average amplitude of the Etna volcanic tremor showed a gradual increase and at around 14:40 UTC it reached the high range.

The resumption of Strombolian activity at the level of the southeast crater was observed at 14:56 UTC.

From 15:25 UTC, the passage of Strombolian activity to the lava fountain stage is observed. Based on the forecast model, the eruptive cloud produced by the current activity disperses in the ESE direction.

After reaching the maximum value around 15:50 UTC, the average amplitude of the volcanic tremor showed a gradual decrease, which became much more evident from 16:40 UTC.

The lava fountain in the Southeast Crater ceased its activity at 5 p.m. UTC; a weak strombolian activity remains with ash emission. In addition, only the lava flow of the SW sector remains supplied.

 

Source: INGV OE

Etna SEC - the fountaining seen by the therm webcam. EMOT / INGV on 07/04/2021 / 3:36 p.m

Etna SEC - the fountaining seen by the therm webcam. EMOT / INGV on 07/04/2021 / 3:36 p.m

Etna - trémor on 05.07.2021 / 07h - Doc. INGV

Etna - trémor on 05.07.2021 / 07h - Doc. INGV

In Fagradalsfjall, the activity has presented a new rhythm in recent days: between an almost total extinction, and a strong surge.

This type of behavior has been the case before, but at the moment the fluctuations are longer and more extreme.

This July 5, the activity was strong, but hidden by the mist in the early hours.

Fagradalsfjall - tremor fluctuations on 04.07.2021 - IMO

Fagradalsfjall - tremor fluctuations on 04.07.2021 - IMO

Fagradalsfjall - a clearing in the fog - webcam langihryggur NV 05.07.2021 / 05h00

Fagradalsfjall - a clearing in the fog - webcam langihryggur NV 05.07.2021 / 05h00

Fagradalsfjall - great activity this 05.07.2021 / 06:35 - webcam mbls

Fagradalsfjall - great activity this 05.07.2021 / 06:35 - webcam mbls

The establishment of the new dam intended to slow the flows is completed; testers have been incorporated into the thickness of the earth / rock layer to check the temperature and pressure during the future overflow by lava.

 

Sources: RUV, mbls, IMO, Volcano Chaser

Fagradalsfjall - Natthaga valley - new dam with built-in pressure detectors to check the pressure experienced by the lava and its temperature during the future overflow - photo Volcano Chaser 30.06.2021

Fagradalsfjall - Natthaga valley - new dam with built-in pressure detectors to check the pressure experienced by the lava and its temperature during the future overflow - photo Volcano Chaser 30.06.2021

During the last 24 hours, the Taal volcano network has recorded seventeen (17) volcanic earthquakes, including one (1) volcanic tremor event lasting forty-five (45) minutes, sixteen (16 ) low-frequency volcanic earthquakes, and low-level earthquake that has persisted since April 8, 2021.

High levels of sulfur dioxide emissions and vapor-rich plumes that reached up to two thousand five hundred (2,500) meters high that drifted southwest, southeast and north - northwest was generated from the main crater of Taal.

Sulfur dioxide emissions reached a new all-time high, averaging 22,628 tonnes / day on July 4, 2021. Based on soil deformation parameters from electronic tilt, continuous GPS and InSAR monitoring , Taal Volcano Island began to deflate in April 2021 while the Taal region continues to experience very slow expansion. since 2020.

 

Source: Phivolcs

Taal - activity summary as of 05.07.2021 / 08h - Doc. Phivolcs

Taal - activity summary as of 05.07.2021 / 08h - Doc. Phivolcs

Yellowstone's seismic activity is currently above background levels, with 445 localized earthquakes for June 2021, but still within historical limits. For example, in June 2017, there were more than 1,100 localized earthquakes!

The June seismicity in Yellowstone was marked by four earthquake swarms. The largest event last month was a minor magnitude 3.1 earthquake located 11 miles northeast of West Yellowstone, MT on June 28 at 8:29 AM MDT. This event is part of a sequence of earthquakes in the same area that began on June 19.
Sequences of earthquakes of this type are common and account for about 50% of the total seismicity in the Yellowstone region.

 

Subsidence of the Yellowstone caldera, which has continued since 2015, slowed in May / June 2021, reflecting seasonal groundwater recharge. Each summer, water from melting snow causes the ground to swell slightly, causing subsidence trends to pause, or even a minor amount of uplift (less than 1 cm / fraction of an inch). In the Norris Geyser Basin area, no significant uplift or subsidence has been detected by a nearby GPS station since early 2020.

Current volcanic alert level: NORMAL

Current Aviation Color Code: GREEN

 

Source: USGS

Norris Geyser Basin - view to NW from S, Yellowstone National Park. - photo Wall Graham / USGS

Norris Geyser Basin - view to NW from S, Yellowstone National Park. - photo Wall Graham / USGS

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