October 11 , 2016. EN. Etna , Nevado Del Ruiz , Klyuchevskoy , Villarica .
Etna, Sicily :
ETNA UPDATE, 10 OCTOBER 2016
Two months after the opening of a small degassing vent in the eastern part of Etna’s Voragine crater, on the early afternoon of 10 October 2016, an explosive event occurred at the Bocca Nuova crater, or in the area between this crater and the nearby Voragine. This would be the first eruptive activity observed at the Bocca Nuova after it was filled by the products from the Voragine during the December 2015 and May 2016 eruptions.
The explosion occurred at 13:26 UTC or 15:26 local time, producing a distinct anomaly in the images recorded by the thermal cameras at the Montagnola (EMOT, see first image at left) and at Bronte (EBT, second image at left), and a small puff of ash that rose a few hundred meters above the summit of the volcano.
It was a single event, which also produced a conspicuous seismic signal; during the following hours, similar though smaller seismic events were recorded, the strongest at 15:16 UTC (17:16 local time), but cloud cover precluded any visual and thermal observations.
ETNA CRATER of VORAGINE
Pit Crater formed from a fracture in the eastern flank of the cracks, August 7 In the photos, you may also notice the subsidence affecting the crater.
ETNA August 2016
During the past weeks, non-eruptive degassing had continued from the vent that opened in the eastern portion of the Voragine on 7 August 2016, accompanied by very rare and rather minor emissions of ash (old pulverized rock) from the eruptive vent located on the upper east flank of the New Southeast Crater cone. Differently from what was thought in the days after the opening of the 7 August 2016 vent, there does not seem to have been any Strombolian activity at this vent, but only emission of high-temperature gas, producing sometimes quite vivid glows visible at night.
Photos : INGV , Giò Giusa.
Nevado Del Ruiz , Colombia :
Bulletin of extraordinary activity of the volcano Nevado del Ruiz, October 9, 2016
Subject: activity Bulletin of the Nevado del Ruiz volcano. The level of activity yellow or (III) persists: Changes in the behavior of the volcanic activity.
Regarding the monitoring of the activity of the Nevado del Ruiz volcano, the Colombian Geological Service reports that:
On October 9, 2016, at 13:05 (local time), a volcano-tectonic earthquakeassociated with the fracturing of the rock inside the volcano, with a magnitude of 3.1 ML (Local Magnitude) located 4,0 km north of Arenas crater was recorded at a depth of 5.2 km. This event was reported as felt by officials of Los Nevados National Park and the residents in the area of influence of the volcano and in the city of Manizales.
Latitude: 55.89 4˚ ‘N, Longitude: 75˚ 19.50‘ W
Depth: 5..2 km
Magnitude: 3.1 ML
The Nevado del Ruiz volcano continues to evolve and it is possible that future events that may indicate an acceleration of the process, involving greater instability of it and therefore changes in the level of activity occurring. While the instability of the volcano covers more than five years, it is essential not to accustomed to this behavior and be attentive to official information to be published by the Colombian Geological Service. He reiterated to the authorities of the departments of Caldas and Tolima actions that focused on the process of reduction and vulnerability management and the risk management of the activity of the Nevado del Ruiz volcano.
It is recommended that communities continue to monitor any changes that may occur in the activity of the volcano.
The Geological Survey OF COLOMBIA closely following the evolution of the volcanic phenomenon and will continue to report timely to the changes that may occur.
Source : SGC.
Klyuchevskoy , Kamchatka :
The (mainly effusive) eruption continues strongly and with little changes. Several lava flows remain active on the upper eastern slopes of the volcano; the one one the western side has stopped at some time around 18 or 19 September.
The abundant lava emission continues to enlarge a field of fresh lava on the upper slopes of the volcano and produces an intense thermal signal. Intermittent mild to moderate ash emissions from strombolian activity in the summit crater produces occasional ash plumes that often are detected on satellite data.
Explosive-effusive eruption of the volcano continues: there are strong gas-steam activity with emission of different amounts of ash of the summit crater and the cinder cone into Apakhonchich chute, and the effusing of lava flows along the eastern flank of the volcano. According to satellite data by KVERT, a large bright thermal anomaly was observed in the area of the volcano all week; explosions sent ash up to 5-6 km a.s.l. and ash plumes extended for about 260 km to the eastern directions from the volcano.
Source : Tom Pfeiffer ( volcanodiscovery ) Kvert .
Photo : Volkstat ru
Villarica , Chile :
Volcano Villarrica (1 to 30 September).
The level of activity of the volcano is in Green Level:
: Active volcano with a stable behavior – No immediate risk.
probable time for an eruption: months / years.
It was recorded a total of 4941 events. 4930 of them were classified as long-period events (LP) related to fluid dynamics to (within the volcanic edifice, with a reduced displacement value (DRC) of less than 13.4 cm2. we also classified 11 events volcano-tectonic types (VT) associated with rock fracturing process.
The event of greater energy presented a local magnitude of M 1.9 and was located 4.4 km east–southeast of the active crater at a depth of 4.5km.
The energy of volcanic tremor (TR), seismic signal associated with the fluid dynamics inside the volcano, presented reduced displacement values (DRC) averaged 3.1 cm2, which is considered as low, while the dominant frequencies were maintained between 1.0 / 2.1 Hz and about 4/5 Hz, the latter being the most persistent recorded during the month.
During this period, there has been a slight but steady increase in the energy of the seismic signal measured on the basis RSAM.
The infrasound sensor installed 4 km from the crater of the volcano, reported lower explosive episodes associated with the surface activity of the lava lake located inside the main crater. The recorded values were less than 2.5 Pascals.
Images recorded with IP cameras installed near the volcano on the days of clear or low cloud cover showed a predominantly white degassing columns with heights of 600 meters and incandescent when weather conditions have allowed to observe the area superior of the volcano. During the 5,10,19 and 24 September days, small ash emissions were recorded.
According to data obtained from five (5) GNSS stations that monitor the deformation of the volcano, no significant changes due to internal dynamics were observed. Oscillations can be observed in the data, higher than the previous period, which are attributed to climate impacts. The data also show that the lengths of control lines that cross the massif remain stable. Furthermore, data from two (2) inclinometers show minimal variations, rather related to weather effects.
The data obtained by the DOAS stations of Los Nevados and Tralco, installed 10 km to the east–northeast (ENE) and 6 km to the east–southeast (SE) of the active crater, respectively , recorded an average value of sulfur dioxide emission (S02) of 587 ± 88 tonnes / day with a maximum value of 1416 ± 79 tons / day, reported on 25 September. Therefore, this shows that the flows remain on levels bases.
An anomaly was recorded in sulfur dioxide (S02) to the atmosphere in the area near the volcano, on September 23 with an emission of 0,053 kT of S02, reported by OMI and NESDIS.
Thermal alerts were reported in the volcano area, most of them took place on September 5 with a radiative power (RVP) of 54 MW, which is considered moderate, according to data released by Middle InfraRed Volcanic observation (Mirova).
These parameters indicate that the activity of the volcano continues at a low level, with possible fluctuations in the dynamics of the lava lake. Note the characteristics of an open conduit phenomenon which can occasionally generate increased degassing, and the occurrence of small explosions, with the main risk the fall of pyroclastic material on the adjacent area of the main crater. For this is maintained a volcanic alert level to green and it is recommended to apply an access restriction to the crater area with a radius of 500 m.
Source : Sernageomin.
Photos: Sarah and lain, Sernageomin ( 2015)