November 06, 2015. EN. Etna, Colima, Mauna Loa, Ubinas .

Home / blog georges Vitton / November 06, 2015. EN. Etna, Colima, Mauna Loa, Ubinas .

November 06, 2015. EN. Etna, Colima, Mauna Loa, Ubinas .

November 06, 2015.

 

Etna, Sicilia :

In the second half of October 2015, there was a return of the magma in the crater of Voragine (often also called « Central ») of Etna, who had shown a similar activity even more intense in the first half of January 2015. during a site visit on October 19 by a technician of the INGV-OE, it was observed an explosive mouth and high temperatures that produced lithic material explosions and puffs of hot ashes rapidly dispersed in the immediate vicinity of the crater.

 

The floor of the Voragine is filled with a growth cone, formed by strombolian activity in progress since last week.

On October 27, the inner mouth of the Voragine was the site of a dynamic Strombolian activity which has been observed in the morning by the staff of the INGV-OE and in the evening by Etna guides. This activity continued in the following days, as revealed by the camera images at high sensitivity of the Montagnola (EMOH) on the southern flank of the volcano. The aggravation of weather between October 30 and November 2 has prevented direct observations and by the cameras of the INGV-OE.

 

 

Explosion in the Voragine, afternoon of November 4, 2015, seen from the southwest edge of the Bocca Nuova

In the early hours of November 3, with better visibility, the images from the camera EMOH have not shown glows in the Voragine, but in the morning took place a few small ash emissions from the same crater. In the afternoon we again observed a modest strombolian activity as shown in the photo. This activity was composed of Strombolian explosions, sometimes with small ash emissions, continued even during an inspection by the INGV-OE staff in the afternoon of November 4. The products of the current activity continue to fill the internal cavity of the Voragine and began to build a small cone on the crater floor.

 

Source : INGV / B Behncke

Photos : B Behncke

 

 

Colima, Mexico :

 

19.514°N, 103.62°W
Elevation 3850 m

Based on satellite images, wind data, and notices from the Mexico City MWO, the Washington VAAC reported that during 31 October-1 November ash plumes from Colima rose to altitudes of 6-6.7.3 km (20,000-24,000 ft) a.s.l. and drifted 20-45 km W and E. On 2 November ash emissions drifted NNE.

The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4320 m high point of the complex) on the north and the 3850-m-high historically active Volcán de Colima at the south.

 

A group of cinder cones of late-Pleistocene age is located on the floor of the Colima graben west and east of the Colima complex. Volcán de Colima (also known as Volcán Fuego) is a youthful stratovolcano constructed within a 5-km-wide caldera, breached to the south, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth.


Source: Washington Volcanic Ash Advisory Center (VAAC)

Photo : Hernando Rivera

 

 

Mauna Loa , Hawaï:

 

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

On Thursday, September 17, the Volcano Alert Level and Aviation Color Code for Mauna Loa was elevated to Advisory/Yellow based on long-term trends in both earthquake and deformation monitoring data.

Activity Summary:
Mauna Loa is not erupting. A swarm of approximately 20 small earthquakes occurred on Mauna Loa’s West Flank at a depth of approximately 8 km (5 mi). Earthquakes occurred beneath Mauna Loa’s upper Southwest Rift Zone at rates greater than background but below earthquake rates recorded over the summer of 2015. Deformation data remain consistent with inflation of magma reservoirs beneath Mauna Loa’s summit and upper Southwest Rift Zone.

http://hvo.wr.usgs.gov/gallery/maunaloa/1984/2441061_L.jpg

1984 : Lava pours down a well-developed lava channel near the erupting vents (background). The vent erupting the greatest volume of lava is in upper right. By March 29, this channel fed an `a`a flow flow that reached 25 km from the vents; the channel width varied 20 to 50 m and extended to within 1 to 2 km of the flow front. In the morning on March 29, a blockage and overflow of the channel occurred about 12 km from the vents (1,800-m level) and took most of the supply away from this lower flow.

 

March 25, 1984 blackdotFollowing 18 months of increased seismicity and summit inflation, Mauna Loa’s most recent eruption began at 1:30 a.m. HST, when a fissure (left) opened in Mokuʻāweoweo, the volcano’s summit caldera. By 4:00 a.m., the eruption had migrated into Mauna Loa’s upper east rift zone, where active fissures eventually reached the 9,300-ft elevation. Fast-moving ʻaʻā flows advanced downslope, and in a matter of days, lava was within 6 km (4 miles) of Hilo city limits. Fortunately, the eruption ended on April 15 before lava reached Hilo.

 

Source : HVO

Photo :   R.W. Decker le 28 Mars 1984.

 

Ubinas, Peru :

Ubinas volcano registered a new explosion today and sent ashes over local communities in the Moquegua region of southern Peru. The Volcanological Observatory of the Institute of Geological Mining and Metallurgy (Ingemmet) reported that the eruption has sent ashes over Querapi, Ubinas, Escacha, Tonohaya, Sacohaya and San Miguel villages.

 

The explosion was recorded at 12:15 p.m. today and emitted a moderate plume of ashes and gases that reached about 2,000 meters above the crater of Ubinas volcano.
The ashes dispersed over a distance of 10 meters to the southeast toward the mentioned villages. About 600 families live near Ubinas volcano within a radius of 12 kilometers. In situations such as these, authorities advise that locals protect themselves with masks and goggles and guard water supplies from contamination

Source : Peruthisweek

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