20/08/2015. English. Copahue, Sakurajima, Nevado Del Ruiz.

Home / blog georges Vitton / 20/08/2015. English. Copahue, Sakurajima, Nevado Del Ruiz.

20/08/2015. English. Copahue, Sakurajima, Nevado Del Ruiz.



Copahue, Chili :

The National Emergency Office of the Interior Ministry reported the occurrence of a seismic swarm under the volcano Copahue in the early hours of Wednesday. The agency has published information of the Volcano Observatory of the southern Andes (OVDAS) of SERNAGEOMIN, an entity that, in its special report Volcanic Activity (RAV) for the Bio Bio region, recorded this phenomenon that was composed of 37 events in the early hours of August 19, between 3:03 and 3:42 hours.



This seismic swarm was located 11.9 km north-northeast (NNE) of the main crater with a depth of 4.41 km. No changes were recorded in the activity on the volcano area  , which are attributable to the swarm. In addition, there were no reports of noticeable earthquakes around the volcano,  said the agency.



Since then, the swarm has decreased and the number of events is returned to the level recorded before. The OVDAS maintains its level of technical level yellow alert and Onemi maintains the yellow alert for the municipality of Alto Bio Bio, as of June 3, 2013, when the level of red alert was taken away. It also remains a high risk area, the first 2.5 kilometers around the crater and it is recommended to limit the approach to this sector.


Source: BioBioChile
Photos :  Nicolas Sieburger, BioBioChile


Sakurajima, Japon :

A very small eruption was observed on Sakurajima early Wednesday, the Meteorological Agency said. The eruption at 3:13 was the first observed on the volcano of 1117 meters overlooking the city of Kagoshima since the alert level was raised last week to 4 on a scale of 5 points. The agency said it observed a phenomenon called volcanic glow, in which the air above the crater looks red because of the reflection of magma and hot volcanic rocks, earlier in the day, during the last Showa eruption vent.



However, our source  on site for two days, indicates that there is no Strombolian explosions but only a white plume more or less dense and no (or very little?) charged to ashes! Although Tuesday’s observations were difficult because of the cloud cover!
The volcano is still in level 4 and access to 3km from the top is firm. No restriction to access at the « volcano peninsula« , the authorities allowed the free movement but only short stops are tolerated on observation points and parking are closed!
The activity is very low on the peninsula but nothing has changed in Kagoshima and ferry circules!
Some Japanese TV crews are present too!
The planes that serve the  Kagoshima airport continues to pass very close to the volcano and a very low altitude!

Yesterday, bubbles of volcanic gases, near the Sakurajima were observed in the sea, at Sakurajima PortFutamata.


Source : Japantimes , S Chermette ( http://80joursvoyages.com/) , 373 news .com.
Photo :  2012. Dr. Richard Roscoe/Getty Images


Nevado del Ruiz, Colombie :


Volcano Activity Bulletin Nevado del Ruiz, August 10 to August 17, 2015.

Yellow activity level or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz volcano, the SERVICIO Geologico COLOMBIANO through the OBSERVATORIO VULCANOLÓGICO Y SISMOLÓGICO OF MANIZALES, reports that:

During the last week, the seismicity related to fluid dynamics process in the volcanic system remains predominant; which shows the instability of the volcano for some time, as evidenced by the different volcanic monitoring parameters. This activity is mainly located in the Arenas crater, east, south and southeast of it, and was characterized by the recording of multiple episodes of volcanic tremors, which are associated with the movement of fluids , gases and ash emissions into the atmosphere.


In addition, has continued the recording of seismic activity associated with the fracturing of the rock in the volcanic structure. Earthquakes are located mainly in the northwest of the volcano and, in lesser amounts, in the Northeast, Southwest; at depths between 2.2 and 6.7 kilometers. The maximum magnitude recorded during the week was 1.4 ML (local magnitude), corresponding to an earthquake located 1.7 km north-east of Arenas crater, which was held on August 15 at 4:06 p.m. (local time) at a depth of 3.77 km. Continuous volcanic deformation show some changes.

The volcano continues to emit into the atmosphere of significant amounts of water vapor and gases, including sulfur dioxide (SO2). The gas and steam column reached a height of 1,000 meters above the summit of the volcano, and is sometimes seen with gray tones due to the presence of volcanic ash. The direction of the dispersion of the column was in harmony with the wind regime, which remained mainly to the western sector of the volcanic structure.


Source : SGC ( http://www2.sgc.gov.co/ )

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