December 20 , 2016. EN. Copahue , Nevados De Chillan , Colima , Sabancaya.

Home / blog georges Vitton / December 20 , 2016. EN. Copahue , Nevados De Chillan , Colima , Sabancaya.

December 20 , 2016. EN. Copahue , Nevados De Chillan , Colima , Sabancaya.

December 20 , 2016.

Copahue , Chile :

The level of activity of the volcano is:
YELLOW LEVEL: changes in the behavior of volcanic activity – probable time for an eruption: weeks / months.

During this period, 834 seismic events, of which fourteen (14) were classified as volcano-tectonic (VT) associated with rock fracturing processes were recorded. Similarly, three hundred and seventy-one (371) events associated with fluid dynamics within the volcano, identified as long-period (LP) earthquakes, were recorded, of which forty-nine (49) were identified as very long-period earthquakes (VLPs).

 

Copahue - 18.12.2016 / 20h30 - webcam Sernageomin

With regard to VT-type seismic activity, the local magnitudes (ML) were less than or equal to M1,8. The biggest energy event (December 3) was located on the west-northwest flank (ONO), 7 km from the Crater El Agrio, with a depth of 1.3 km.
For LP events, they had a reduced displacement value (RDC) of less than 1.9 cm2, while VLP events had a reduced displacement value (RDC) of less than 4 cm2. These events were located around the El Agrio crater.

During the period under review, a constant, low magnitude tremor signal was recorded, mainly associated with the issue of gases and the emission of particulate matter (ash) from the El Agrio crater. This signal had a reduced displacement value (DRC) oscillating around 1.3 cm2. The dominant frequencies are concentrated in a band between 1.2 and 2.1 hz.

 

copahue

From the data obtained from three (3) GNSS stations which measure the deformation of the surface of the volcano,minor amplitude variations are observed on the horizontal and vertical components of the lines passing through the volcano, near and not superior at a rate of -0.3 cm / month.
The emission of sulfur dioxide (S02) recorded on the Copahue volcano by the DOAS (Differential Optical Spectrometry) team, Mellizas station, located 5 km east-northeast (ENE) of the active crater  have an average value of 1071 ± 358 t / day and a maximum value of 3082 t / day, recorded on 12 December. The average flow is considered moderate for this volcano.

The IP cameras installed near the volcano recorded a constant degassing of the active crater (El Agrio), characterized in most cases by a greyish coloration showing the presence of the particulate matter.
No anomalies were reported in sulfur dioxide (SO2) emissions to the atmosphere in the volcano area, according to data obtained by IMO, SulfurDioxideGroup (http://so2.gsfc.nasa.gov/ ) And NESDIS (http://satepsanone.nesdis.noaa.gov).

 

copahue

Thermal alerts were reported on the volcano during the first fortnight, mostly on 14 December, with a 9 MW volcanic radiating power (RVP), which is considered to be low according to data published by Mirova on its website ( Http://www.mirovaweb.it/), a detection system that indicates major changes in the temperature of the earth’s surface.

On the basis of data and trends recorded during the previous months, activity continues with a dominant superficial strombolian activity, confined within the El Agrio crater, in relation to the slow rise of a small volume of magmatic material and / or its degassing in an open volcanic system, in interaction with the hydrothermal system. As a result, this type of activity can continue over a large period of time, oscillating, without discarding   increases in activity associated with small phreatic explosions and / or strombolian activity in the area adjacent to the crater . Therefore, the area within a radius of 1.5 km around the El Agrio crater is considered as high risk zone and it is therefore recommended to restrict access to this area. The technical alert level remains at YELLOW LEVEL.

 

Source : Sernageomin

photos : sernageomin

 

Nevados De Chillan , Chile :

The level of activity of the volcanic complex is at the level:

Activity level Yellow, Changes in the behavior of the volcanic activity.

During this period 1318 seismic events were recorded, of which 100 were related to rock fracturing processes, called volcano-tectonic (VT), with a maximum local magnitude (ML) of 2.2, associated with an  event localized at 2.2 km to the east-north-east of the active crater with a depth of 4.3 km. Similarly, 1218 events called long period (LP) were recorded in relation to the dynamics of the fluids under the volcanic edifice. The largest amplitude event was recorded on December 13 at 4:06 local time, with a magnitude of M2.9 and a reduced displacement value of 258 cm.

 

nevados de chillanDuring this period, have continued to record explosions associated primarily with fluid events (LP and tremors – TR). The most energetic event took place on 10 December at 13:04 (local time), with a reduced displacement value (RDC) of 117 cm2.
According to the data obtained by five (5) GNSS stations and two inclinometers (2) which control the deformation of the volcanic complex, the trends observed above are maintained, with horizontal displacement rates not exceeding 0.2 cm / month. In addition, GNSS control lines passing through the volcanic complex showed no variation in trends since April 2016, with a displacement rate calculated for this period of 0.15 cm / month. On the other hand, the data provided by two inclinometers do not indicate any variation related to the activity of the volcano.

DOAS equipment (Differential optical absorption spectrometry) Chilian Station, located 3 km east-northeast (ENE) of the active crater, did not record any data this month.
No anomalies were reported in sulfur dioxide (SO2) emissions to the atmosphere in the volcano sector, according to data from the Ozone Monitoring Instrument IMO, Sulfur Dioxide : //so2.gsfc.nasa.gov/) and NESDIS (http://satepsanone.nesdis.noaa.gov).


nevados de chillan

A thermal alert has been reported in the volcano area with a 2 MW volcanic radiating power (RVP), which is considered low according to data published by Mirova, on its website (http://www.mirovaweb.com). It /), a detection system that indicates major changes in the temperature of the earth’s surface.
In the last few days, sporadic explosions from the area of craters formed in 2016 have been recorded, indicating that the volcanic complex continues with unstable behavior. However, activity remained within the margins it posted in the previous months.
In this context, there is the possibility that new explosive phases of phreatic and / or phreatic magmatic type will occur, from the location of the active craters, with greater intensity.
For all this, the level of activity YELLOW is maintained, and is considered as zone of high risk the zone contained within a radius of 3 km around the active craters. It is therefore recommended to restrict access to this area.

Source : Sernageomin

 

Colima , Mexico :

Mexico’s Colima volcano erupts three times in one day

18 DECEMBER 2016. Mexico‘s Colima Volcano has sent three eruptions in the space of a few hours, spewing ash and vapour more than a mile into the air.
The civil defence office of that western state of Jalisco says the three eruptions occurred Sunday morning. The biggest columns of ash reached 1.25 miles (2 kilometres) in height, and the smallest was just under a mile tall.

 

colima

Video showed a large explosion around 9 p.m. Saturday night (0200 GMT Sunday) with glowing lava, smoke and ash shooting from the volcano in front of a starlit, night sky.
An earlier explosion sent a large plume of ash and smoke some 2,000 meters (4,921 feet) into the air around 4 p.m. (2200 GMT).

Also known as the Volcano of Fire, the 12,533-foot (3,820-meter) volcano is 430 miles (690 kilometres) west of Mexico City.
The 3,800 metre volcano has increased in activity since October. The eruptions cap about 10 days of periodic exhalations at the volcano, which is one of Mexico’s most active.

Source :   GLOBAL NEWS

Photo : Hernando Rivera

 

Sabancaya , Peru :

Seismicity has shown a slight decrease over the last few days. Hybrid events (HIB) dropped from 14 to 6 earthquakes per day compared to the first days of December. The long period seismicity (LP), associated with the movement of fluids (gas, steam, magma) continues to predominate.
366 explosions were recorded.
The eruptive columns of gases and ashes reached up to about 3500 meters above the top of the volcano, spreading over a large radius of 35 km northeast, east, south-east and south of the volcano.
There was a slight decrease in deformation curves.
The volcanic gas stream (SO2) records a maximum of 3400 tons / day.

sabancaya

Recommendations:

Keep up-to-date with reports published jointly by OVI and OVS.
Do not approach within 10 km of the volcano.
If ash falls: cover your nose and mouth with a damp cloth or a mask.
Wipe your eyes and cool your throat with pure water.
Avoid wearing contact lenses.
Keep the windows closed.
Implement prevention and mitigation measures.

 

Source : IGP

Photo  : Thorsten Böckel

Recommended Posts

Leave a Comment

Nous contacter

Nous ne sommes pas disponibles pour le moment. Mais vous pouvez nous envoyer un email a l'aide du formulaire ci-dessous.

Not readable? Change text. captcha txt

Start typing and press Enter to search