November 22 , 2015. EN. Copahue, Galeras, Kilauea.

Home / blog georges Vitton / November 22 , 2015. EN. Copahue, Galeras, Kilauea.

November 22 , 2015. EN. Copahue, Galeras, Kilauea.

November 22 , 2015.



Copahue, Chile :

Based on the analysis of information collected by surveillance equipment and the volcano monitoring staff, the National Geology and Mining Service (SERNAGEOMIN) through the Volcano Observatory of the southern Andes (OVDAS), communicates the following:

Since 7:30 p.m. (10:30 p.m. GMT) on 19 November, the seismicity of Copahue volcano presents oscillating variations in the amplitude of the tremor signal, reaching values of reduced displacement (DR) at least equal to 3, 0 cm2, with frequencies between 1.2 to 2.7 Hz, with dominant frequency of 1.5 Hz, with monochromatic trends by periods.

In addition, from 3:05 HL (6:05 UTC) the level of activity on the surface of the crater began to increase with small explosions accompanied by ash emissions and incandescence. The explosion of higher energy appeared at 03:40 (6:40 GMT) with an acoustic component of 1.4 Pa reduced to 1 km and a maximum height of 1000 meters, located to the East North – East (ENE).

At the time of publication of this report the particles of matter emissions continue, and so it will evaluate their evolution over time.
Therefore, as this scenario may continue producing minor explosions in the crater, the recommendation to an exclusion zone of 1.5 km around the crater El Agrio is repeated, to be considered as high risk area and the level of technical alert remains at YELLOW level.


Source : Sernageomin

Photo : Asociacion Geologica Argentina



Galeras , Colombia :


Subject: Weekly Bulletin activity of Galeras volcano.

The level of activity of the volcano remains at: LEVEL YELLOW (III): changes in the behavior of volcanic activity

Following the monitoring activity of the Galeras volcano, the SERVICIO Geologico COLOMBIANO, the OBSERVATORIO VULCANOLÓGICO Y SISMOLÓGICO OF PASTO (SGC-OVSP), noted that:

Compared to the previous week, there was an increase of seismic events, from 49 to 140 events. The volcanic activity has been dominated by earthquakes associated with the fracturing of rock materials. Most of these events were located in or near the volcanic crater with epicenters to a distance less than 1 km, depths less than 3 km, from the summit of Galeras (reference level over 4200 meters) and magnitudes between M 0.1 and M 1.6 on the Richter scale.

Afficher l'image d'origine

For the period evaluated, the value of the maximum flow rate of sulfur dioxide into the atmosphere from the active crater, was 310 tons / day, on November 10, which is considered low for the Galeras volcano.
For most of the evaluation period, favorable weather conditions have allowed to observe the emission of white columns, low-lying and spreading out under the conditions of prevailing wind regime in the region.

The SGC-OVSP continues to oversee the evolution of the volcanic phenomenon and report on changes that can be recorded.


Source : SGC-OVSP


Kilauea, Hawaï:

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
Kilauea Volcano continues to erupt at its summit and from its East Rift Zone. There is no significant change in tilt occurring at the summit of Kilauea this morning. The East Rift Zone lava flow is active northeast of Pu’u ‘O’o, and breakouts remain within about 7 km (4 mi) of the vent. The flow does not currently pose a threat to communities. Low levels of seismic activity continue across the volcano. At the summit the lava lake is still active.

Summit deflation over the past day was associated with the summit lava lake level slowly dropping. When this happens, collapses commonly occur within the Overlook crater. Solidified lava, attached to the Overlook crater walls, collapsed into the lake on several occasions today, triggering small dust plumes and agitation of the lake surface.

Summit Observations:
Yesterday’s inflationary tilt slowed through yesterday evening and little change in tilt has occurred since around midnight. The summit lava lake remains active, and seismic tremor continues with episodic bursts associated with spattering within the Overlook vent. This morning, the depth to the surface of the lava within the overlook vent is approximately 50 m (165 ft) below the floor of Halema’uma’u. Seismicity remains at low levels. Summit sulfur dioxide emission rates averaged around 4,000 metric tons/day for the past week.

Pu’u ‘O’o Observations:
Webcam views of Pu’u ‘O’o during the past day showed no changes in the persistent incandescent crater vents. No significant net change in tilt has occurred over the past day. Seismic activity remains low. The sulfur dioxide emission rate from all East Rift Zone vents was about 460 metric tons/day when measurements were last possible on November 5, 2015.

June 27th Lava Flow Observations:  
Webcam views overnight show continued activity on the flow field. The June 27th lava flow is active, with surface flows scattered northeast of Pu’u ‘O’o. All active flows are between around 1.9 and 7 km (1 and 4 mi) of Pu’u ‘O’o. There is no lava flow threat to nearby communities.


Source : HVO
Photo : HVO, Bruce Omori.


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