Activity of Etna, Fagradalsfjall, Taal and Yellowstone.

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

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.

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

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

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