May 21 , 2016. EN. Etna , Fuego , Bárðarbunga , Pavlof , Turrialba.
May 21 , 2016.
Etna , Sicily :
On the morning of 21 May 2016, the Voragine made its third paroxysm in less than 72 hours.
But the tremor is now falling.
The new update of the INGV will be published as soon as possible
Source : B Behncke.
Photo : Turi Caggegi
Fuego, Guatemala :
Guatemala May 20, 2016, 7:10 p.m. (local time)
Fuego volcano eruption with pyroclastic flows.
Body type: composite Stratovolcano
Geographical location: 14 ° 28’54 « N Latitude; 90 ° 52’54« W. Longitude
The Fuego volcano continues its eruptive activity, generating pyroclastic flows like « Boiling Over » (phenomenon caused by overheating of the magma, then leaving the crater quickly with abundant volcanic material and hot clouds). Seismic recording of FG3 station shows the descent of small pyroclastic flows circulating through the canyon of Las Lajas, causing avalanches on their way.
This type of eruption provides a lot of debris in the canyons, filling up, so they can overflow in areas where it already exists deposits from past eruptions.
Due to weather conditions, these materials can cause lahars at high temperatures and affect downstream channels, causing floods.
Ash falls on the southern flanks, Southwest and West of the volcanic complex, at a distance of 20 km is not excluded.
The ash in contact with drops of water form the mud, it is advisable not to leave the house and to remain attentive to this activity.
This is an eruptive phase of Fuego volcano that can continue in the coming hours, days or weeks, it is not appropriate to be in the canyons or near them.
Therefore, the INSIVUMEH recommends:
At the SE-CONRED:
Implementing vigilance deems necessary depending on the activity and to be aware of the behavior of the volcano, given the existing deposits of current material can generate large lahars in the ravines of Las Lajas and El Jute in the evening because of rainfall today.
At civil aviation:
It is recommended to take precautions with air traffic, the ash plume moves to the South, Southwest and West, a distance of 20 km, with the opportunity to move further in the hours.
Source : Insivumeh.
Photo : G Chigna
Bárðarbunga , Iceland :
On the Bárðarbunga earthquakes
Seismic measurements around Bárðarbunga volcano show that the seismic moment release on the caldera ring fault has been gradually increasing since mid September 2015. This means that stronger earthquakes than before are detected in the last months. Despite of the increasing activity, there are currently no signs of volcanic tremor.
The analysis of the earthquake data suggests that the movement on the fault is opposite to what it was during the subsidence period during the Holuhraun eruption. Continuous GPS measurements show movements away from Bárðarbunga, suggesting inflation. Satellite images processed by the University of Iceland show that hydrothermal cauldrons in the ice at the caldera rim have been deepening, which might reflect increasing geothermal activity.
Since the end of the Holuhraun eruption in February 2015, 45 earthquakes of magnitude larger than M3 have been detected around the Bárðarbunga caldera, 42 of them since 1st September 2015 and 31 since 1st January 2016. Strongest events were M4.2 on 8th April 2016 and M4.4 on 20. May 2016. Despite of the increasing activity, there are currently no signs of volcanic tremor.
Increasing activity under Bárðarbunga in the last months might reflect magma accumulation below the volcano. Though other explainations have been considered, for example increasing water pressure in the hydrothermal system inside the caldera, pressure changes due to changing ice load or increased friction on the ring fault due to increasing magma pressure.
The Icelandic Meteorological Office is following the activity 24/7 and will update the public in case of any changes.
Source : Vedur . is.
Pavlof , Alaska :
Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: YELLOW
Previous Aviation Color Code: ORANGE
Issued: Friday, May 20, 2016, 11:35 AM AKDT (20160520/1935Z)
Source: Alaska Volcano Observatory
Location: N 55 deg 25 min W 161 deg 53 min
Elevation: 8261 ft (2518 m)
Volcanic Activity Summary:
The recent period of eruptive activity at Pavlof Volcano that began on May 13, 2016 has ended. Minor ash emissions were last observed on May 16. Since then, we have not detected seismic signals associated with ash emission or lava effusion. Satellite observations show no evidence for eruptive activity. Thus AVO is lowering the Aviation color code and Volcano Alert Level to YELLOW/ADVISORY.
The volcano remains in a heightened state of unrest. Pauses in eruptive activity of days to weeks are common during eruptive episodes of Pavlof Volcano. A return to eruptive activity remains possible and could occur with little or no warning. Thus, AVO will continue to monitor the volcano closely and will issue additional information as necessary.
Source : AVO
Photo: Royce Snapp
Turrialba , Costa Rica :
10:30 p.m. Ash emissions continue on the Turrialba volcano.
As that observed at this time through the remote surveillance camera of OVSICORI, installed at the top of the volcano. Activity remains constant, with a tremor signal high, with little variation since 7:20, and pulse generating higher ash exits, the last 10 minutes in the form of seismic signals, as indicated by the installed instrumentation the RSN and OVSICORI.
The emanation of ash persists, the column reaches approximately 300 m above the crater and is dispersed in the West–Northwest direction.
Winds can always raise more than ash and transport them to the top of the Central Valley and northern Heredia.
The CNE and the scientific and technical organizations are constantly monitored.
Source : CNE
Photo : Blas Sánchez