May 24 , 2016. EN. Etna , Turrialba , Fuego , Mauna Loa .

Home / blog georges Vitton / May 24 , 2016. EN. Etna , Turrialba , Fuego , Mauna Loa .

May 24 , 2016. EN. Etna , Turrialba , Fuego , Mauna Loa .

May 24 , 2016.

Etna , Sicily :

ETNA UPDATE, 23 MAY 2016, 17:30 UTC

During the past few days, two further eruptive episodes have taken place in Etna’s summit area. The first, in the early morning hours of 21 May 2016, occurred at the Voragine, which had been the site of two paroxysmal episodes on 18 and 19 May. This latest episode was preceded by modest Strombolian activity, which started around noon on 20 May, producing explosion noises audible in a vast area on Etna’s southern and eastern flanks. In the night, the activity gradually intensified, with explosions from two or three vents within the Voragine. Contemporaneously, renewed inflation of the summit area was recorded by a clinometer at Punta Lucia, to the northwest of the summit craters, as had happened also before the preceding paroxysms. Shortly after 04:00 local time (=UTC+2) and accompanied by a rapid increase of the volcanic tremor amplitude, the Strombolian explosions passed into pulsating jets of lava, launching incandescent bombs to a distance of about 1 km (to the southern base of the Bocca Nuova), and an eruption column was blown by the wind toward south-southeast.


The images recorded by the thermal monitoring camera at Monte Cagliato (EMCT, on the eastern flank of Etna) show that eruptive activity also occurred form a vent in the southern portion of the Northeast Crater, which had collapsed on 18 or 19 May. Visibillity was rather reduced due to weather clouds and further deteriorated in the final phase of the paroxysm. Yet it was possible to observe, during the climax of the paroxysm, that a fracture formed on the southeastern flank of the central cone, and in the « saddle » between this cone and the old cone of the Southeast Crater an effusive vent became active, which emitted a small lava flow toward the Valle del Leone. The photo above at left, courtesy of Alessandro Lo Piccolo, shows the explosive activity at the Voragine at right, and the little lava flow further left, which had advanced a few hundred meters. Again, lava erupted from the Voragine spread out over the floor of the nearby Bocca Nuova, already completely filled by the earlier lavas from the Voragine, and overflowed its western rim, feeding a multilobate lava flow that covered the lavas from the overflows on 18 and 19 May. The activity started to diminish around 05:00 local time, and was essentially over by 06:00.



Since the morning of 22 May, the eruptive vent formed o 25 November 2015 on the upper east flank of the New Southeast Crater cone was the source of a series of ash emissions, with plumes which in the absence of wind rose several hundred meters above the summit and then dispersed in the atmosphere. Some of these emissions produced small anomalies in the images of the thermal camera EMCT, pointing to the presence of hot material. On the evening of 22 May, Strombolian activity resumed at the Northeast Crater, which continued at flucutating rate and intensity through the night. The strongest explosions ejected incandescent bombs up to a few hundred meters above the crater rim, some of which fell onto the flanks of its cones. Today, 23 May, sporadic ash emissions continued from the vent on the upper east flank of the New Southeast Crater cone.

The activity of Etna is monitored continuously by the systems of video and thermal cameras, seismic stations and ground deformation.

Source : INGV

Photo : Salvatore Lo Giudice ,Turi Caggegi .



Turrialba , Costa Rica :

Volcanologists Believe Turrialba Trending Towards Greater Activity
23 MAY 2016. Today Monday is the fourth consecutive day of Turrialba volcano spewing ash, gases and pyroplastic materials. The volcano has not stopped since Friday. The experts at the Red Sismológica Nacional (RSN) – National Seismological Network, say the there is a great amount of pressure in the interior of the volcano, the magnitude is not known.

Most of the time the volcano’s behaviour has been passive without explosions, however, experts says the odds are that the activity will increase. From the first hours of the eruption communities, mainly in the northeast side of San Jose, like Coronado and Moravia were the most affected.


The ashfall has continued west to areas of Pavas, Santa Ana, Belen in Heredia and Alajuela. Some reports say ashfall has reached the Central Pacific coast.

On Sunday. added to the list of affected areas are San Gerardo de Irazú in Oreamuno and Picada and la Silvia, in the area of Santa Cruz de Turrialba nearest the volcano, within 2 kilometres of the crater. San Gerardo is about 5 kilometres.

The Comisión Nacional de Emergencia (CNE) – National Emergency Commission and the mayor of Oreamuno, Catalina Coghi Ulloa, says there is concern for the some 50 families living in the area, the six students at the local school, the 20 dairy farms and almost 2,000 cows. The mayor added that milk production has dropped some 15% due to the constant ashfall.

Although airport operations at San Jose’s Juan Santamaria International (SJO), many airlines (local, regional and international) have cancelled flights since Friday.


Source :  Q COSTA RICA

Photo : Volcan Turrialba lodge



Fuego , Guatemala :

Guatemala, May 23, 2016 Time: 12: 40

End of the eruption of the Fuego volcano.

Type: vulcanian
Morphology: composite Stratovolcano
Location Geographical: 14 ° 28 ’54 « N latitude, 90 ° 52′ 54″ W. longitude
Altitude: 3,763m.

The eruption of the Fuego volcano ends, it has been characterized as a strombolian eruption with explosions and moderate effusion of lava accompanied by strong rumblings, ejecting ash columns that reached the 5000 meters in paroxysmal stage with movement towards West, the Southwest, at a distance of 15 km.
The Volcano Observatory OVFGO, reported only a white plume, low ash explosions moderate until 4800 m, moving westward -South West at a distance of 15 km. On the southeast side, in the canyon las Lajas, still maintains the lava flow of 1500 meters long, which will disappear in the coming hours. The eruption has not generated pyroclastic flows.
Seismic activity recorded by the station FG3 note of low frequency events associated with low to moderate explosions, the graph shows the RSAM completion of the eruption phase.



The INSIVUMEH recommends:
Continue to monitor the activity of the Fuego volcano.
At the Directorate General of Civil Aviation:
It is recommended to take precautions with traffic in the area of the Fuego volcano, because there are still scattered ash 15 kilometers on the western and southwest flank  of the volcanic complex.

Source : Insivumeh

Photo : AP Castillo



Mauna Loa , Hawai :

19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Activity Summary:
Mauna Loa is not erupting. Seismicity remains elevated above the long-term background level, but no significant changes were recorded over the past week. Deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone continues, with inflation recently occurring mainly in the southwestern part of the magma storage complex.


 The plot below shows changes in distance across Mokuʻāweoweo, Mauna Loa’s summit caldera, since 1974, as measured by continuously recording GPS stations. Increases in distance often indicate increased pressure in the magma reservoir beneath the summit area (inflation).


The large extensions associated with the 1975 and 1984 eruptions were caused by magma rising from the summit reservoir to the volcano’s surface and accompanied by increased rates of seismicity. During the 1984 eruption, the summit area contracted and subsided rapidly as magma left the reservoir to feed the eruption along the northeast rift zone. When the eruption stopped, the summit magma reservoir immediately began to re-inflate. The inflation ceased in 1993; distances across the caldera decreased and the ground surface subsided from then until 2002.

 mauna loa

In May 2002, years of slow contraction and subsidence abruptly changed to extension and uplift. GPS measurements and remote imaging revealed patterns of ground-surface motion that indicated renewed influx of magma into a complex shallow magma system below. The extension and uplift rates increased dramatically in July 2004, as a swarm of very deep earthquakes started. The high rates of inflation slowed dramatically in 2005 and continued to slow until completely ceasing by mid-2013. Inflation resumed in mid-2014.

Source : HVO

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