December 08 , 2016. EN. Nevado Del Ruiz , Cayambe , Piton de la Fournaise , Langila .

Home / blog georges Vitton / December 08 , 2016. EN. Nevado Del Ruiz , Cayambe , Piton de la Fournaise , Langila .

December 08 , 2016. EN. Nevado Del Ruiz , Cayambe , Piton de la Fournaise , Langila .

December 08 , 2016.

 

Nevado Del Ruiz , Colombia :

Weekly activity bulletin of the volcano Nevado del Ruiz, from 29 November to 5 December, 2016
The level of activity continues at the level activity  yellow  or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the volcano Nevado del Ruiz, the Colombian Geological Service reports that:

During the last week, various monitoring parameters show that the Nevado del Ruiz volcano remains unstable. The seismic activity associated with rock fracturing under the volcanic edifice showed a decrease in the number of earthquakes and seismic energy released compared to the previous week. This seismicity has been localized mainly in the distal North, South and Southeast seismogenic sources, and to a lesser extent in the South-West areas of the volcano and in the Arenas crater and surrounding area. The depths of the earthquakes varied between 0.7 and 7.0 km. The maximum magnitude recorded during the week was 1.5 ML (local magnitude), corresponding to two earthquakes recorded on 04 and 05 December at 23:42 and 08:51 (local time), at 2.94 and 3.18 km depth, respectively, located southwest of the Arenas crater.

 

nevado del ruiz

Seismicity related to the dynamics of the fluids in the ducts of the volcanic structure was characterized by the appearance of earthquakes with different long-period (LP) and very long period (VLP) energy levels, pulses of Tremors and multiple fluid earthquakes. This type of seismicity was mainly located in the Arenas crater and the southeast sector of the volcano. Some of these seismic signals have been associated with emissions of gases and ash into the atmosphere, as confirmed by the images captured by the cameras installed in the volcano region and by the reports of the managers of the Natural Park of Los Nevados (Pnnn). The recording of new seismic signals of this type with higher energy levels that may be associated with emissions of gases and ash is not excluded. It is important to remember that ash processes can occur over several days and sometimes several times a day without involving an individual report for each episode.

nevado del ruiz

Volcanic deformation, measured from electronic inclinometers, Global Navigation Satellite Systems (GNSS) and satellite images to determine changes in tilt, position and shape of the volcano, continues to record in recent months inflation and intermittent inflation / deflation impulses possibly linked to emissions of gases and ashes.

The volcano continues to emit significant amounts of water vapor and gases, including sulfur dioxide (SO2), as evidenced by the values obtained by the SCANDOAS stations installed in the volcanic zone and on the satellite image. In the tracking information provided by the Mirova portal, no thermal anomalies were identified.
The column of gas, steam and ash from time to time reached a maximum height of 2000 m above the top of the volcano on 02 December. The direction of dispersal of the column was in line with the dominant wind regime in the area, which fluctuated between the Southwest and the Northwest during the week.

The volcano Nevado del Ruiz continues to activity level Amarillo.

Source : Ingeominas

Photos : skyscrapercity.com

 

Cayambe, Ecuador :

Thermal measurements of water and gas resources around the Cayambe volcano in the Otavalo Zone

Between November 30 and December 1, 2016, a team of technicians from the Institute of Geophysics visited the Cayambe region to measure gas emissions and physicochemical parameters in its hot springs.
Using the Mobile DOAS technique, the main roads around the volcano were traveled, looking for volcanic gas emissions. It should be mentioned that during these voyages no SO2 emissions from the Cayambe volcano were identified.

Mediciones de Fuentes de Aguas Termales y Gases en el Volcán Cayambe y la Zona de Otavalo

Figure 1. Measurements at the source of Contadero, located on the northwest flank of Cayambe.

In addition, the hot springs of Contadero and Sayaro, where measurements of pH, conductivity, temperature and dissolved CO2 were made, were visited. Samples were then collected and analyzed at the Center for Environmental Research and Control (CICAM) of the Ecole Nationale Polytechnique.

 

 cayambe

These campaigns complement the measures that enable daily monitoring activities on the Cayambe volcano.
In addition, similar measures are carried out in the thermal waters of Tangali and springs near the cascades of Peguche, which are made on a regular basis.

Source : IGEPN

Photos : IGEPN , surtrek.org

 

Piton de la Fournaise , La Réunion :

Seismicity

The volcano-tectonic activity under the Piton de la Fournaise remained at a low level during the month of November.

During the month of November 2016, the OVPF registered in total:

3 superficial volcano-tectonic earthquakes (0 to -2 km below the surface) under the summit craters;
3 deep earthquakes (> 2 km deep) under the eastern flank of Piton de la Fournaise;
542 collapses (in the Crater Dolomieu, at the ramparts of the Enclos Fouqué and on the flow of September 2016);
19 local earthquakes (under the island, Piton des Neiges side);
27 regional earthquakes (in the Indian Ocean area).

Summary of superficial volcano-tectonic seismicity at Piton de la Fournaise from 18 September to 30 November 2016. (© OVPF / IPGP)

Deformation

The end of the inflation of the summit area observed in October is continuing. On some stations, slight deflation is even observed.

Illustration of deformation during the last six months (eruptions of 26-27 May and 11-18 September 2016 are shown in yellow). (Left) Here is shown a baseline (distance between two GPS receivers) crossing the Dolomieu crater from east to west (in black the raw data, in blue the smoothed data over a week). A rise is synonymous with elongation and therefore swelling of the volcano; Conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. (© OVPF / IPGP)

In contrast, more distant stations (witness the influence of deeper sources of pressure) from the base of the cone or the edge of Enclos Fouque continue to show signs of inflation but at very low levels, with a maximum elongation between two 0.3 mm stations in two months.

Piton cratere-dolomieu

Gas Geochemistry

Fumaroles summital: The excess of atmospheric CO2, H2S and SO2 remain generally low. However, there is a presence of H2S (low but above background) coupled with H2O. Since November 11, a low concentration of SO2, well coupled to CO2, is detected. However, CO2 / SO2 ratios remain relatively low.
Concentration of CO2 in the soil at remote stations (area excluding Enclos Fouqué): CO2 concentrations in the soil at the Gite du Volcan  station remain low, while the tendency is to decrease in the more distant stations of the Plaine des Caffres and the Plaine des Palmistes.

Source : OVPF

Langila , New Britian , Papua New Guinea :

5.525°S, 148.42°E
Elevation 1330 m

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 1-6 December ash plumes from Langila rose to altitudes of 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted NE, NW, and W. The plumes on 3 December drifted almost 40 km.
Langila-cr-2---3---Wally-Johnson-Austr.-bureau-of-mineral-r.jpg

Langila 04.09.1970 seen from the northwest: steam leaves craters 2, left, and crater 3, right. Between the two, set back, the edge of the crater 1.

Langila, one of the most active volcanoes of New Britain, consists of a group of four small overlapping composite basaltic-andesitic cones on the lower eastern flank of the extinct Talawe volcano. Talawe is the highest volcano in the Cape Gloucester area of NW New Britain. A rectangular, 2.5-km-long crater is breached widely to the SE; Langila volcano was constructed NE of the breached crater of Talawe.

langila-25.10.1985--eqh.dpri.kyoto-u.ac.jp.jpg

Langila – eruptive episode of 29.10.1985 – photos eqh.dpri.kyoto.

An extensive lava field reaches the coast on the north and NE sides of Langila. Frequent mild-to-moderate explosive eruptions, sometimes accompanied by lava flows, have been recorded since the 19th century from three active craters at the summit of Langila. The youngest and smallest crater (no. 3 crater) was formed in 1960 and has a diameter of 150 m.

Source : GVP

Photos : Wally Johnson, 1970 (Australia Bureau of Mineral Resources) , eqh.dpri.kyoto. Annotations : B Duick.

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