December 06 , 2017. EN. Agung , Villarica , Ertaale , Klyuchevskoy , Copahue .
December 06 , 2017.
Agung , Indonesia :
On the basis of the visual and instrumental data analysis and taking into account the potential threats of danger, on November 27, 2017 at 06:00, G. Agung returned from Level III (SIAGA) status to Level IV (AWAS). Since yesterday and until today visually the volcano is clearly visible until the appearance of the mist. The smoke rising from the crater is thin, of medium pressure, white and reaches a height of about 1500-2000 m above the peak and tilts towards the West and the East. At night, there was a brief glimpse of the glow of the incandescent lava in the crater. This day, there is no explosive eruption and a tremor was recorded « off scale », at 14:41, 18 minutes and 16h26 for 24 minutes.
Seismograph records as of December 05, 2017 have noted:
12 shallow volcanic earthquakes (VB)
4 deep volcanic earthquakes (VA)
No local earthquake.
No earthquakes of explosive eruption.
44 events of the type Low frequency.
1 harmonic tremor.
A continuous tremor with an amplitude of 1 to 24 mm and a dominant value of 1 mm.
As of December 06, 2017 (from 00:00 to 06:00) it has been registered:
No earthquake of emission.
8 Low frequency earthquakes.
5 shallow volcanic earthquakes (VB)
3 deep volcanic earthquakes (VA)
No local earthquake.
A continuous tremor with an amplitude of 1 to 2 mm and a dominant value of 1 mm.
Recommendations: The communities around G. Agung and climbers / visitors / tourists should not climb and do activities in the danger zone around the crater of G. Agung and in all areas within 8 km radius. crater. A sectoral extension has been added north-northeast and south-east-south-south-west up to 10 km from the crater of G. Agung. The estimated area risks are dynamic and continuously assessed and can be modified at any time based on the most recent observational data from G. Agung.
Source : VSI , Magma .
Villarica , Chile :
Activity Bulletin of 30/11/2017.
6484 seismic events were recorded, of which 6299 were classified as long-lived earthquakes (LPs) in relation to fluid dynamics within the volcanic edifice, with reduced displacement values of less than 9 cm2. In addition, 185 events were classified as volcano-tectonic earthquakes (VT) associated with fractures of rigid materials. The largest energy event had a local magnitude of M 3.7, located 2.3 km east-southeast of the crater at a depth of 3.6 km.
A volcanic tremor signal, a seismic signal also associated with the dynamics of fluids inside the volcano, from the second half of the month, showed an upward trend in energy, reaching a maximum value of 13 cm2 during period. On the other hand, the dominant frequencies remained between 1.0 and 2.1 Hz.
The images recorded with the IP cameras installed in the vicinity of the volcano, when the weather conditions allowed it, showed a weaker, mainly whitish, outgassing, which did not exceed 100 m in height. In addition, nocturnal glow is recorded, sometimes associated with minor crater explosions.
The infrasound sensor recorded minor explosions associated with the surface activity of the lava lake housed in the main crater. The maximum calculated value was 4 Pascals reduced (value considered low).
Aerial photo (37,000 feet) of VOLCANIC COMPLEX of VOLCAN VILLARRICA (December 2). Parasitic cones, eruptive fissures, caldera, Turbio-Pichillancahue glacier, crater 200 meters in diameter at 2 854 m are observed. and a fumarole that bends to the south.
According to data provided by three (3) GNSS stations and two (2) inclinometers, no significant changes attributable to the evolution of the internal volcanic activity were detected during this period.
No emissions of sulfur dioxide (SO2) to the atmosphere in the volcano area have been reported, according to data published by the Ozone Monitoring Instrument (OMI) Sulfur Dioxide Group (http: / /so2.gsfc.nasa.gov/) and the National Environmental Satellite Data and Information Service (NESDIS) (http://satepsanoine.nesdis.noaa.gov).
During the period, an increase in the number and intensity of thermal warnings in the volcanic area, with a reported Radiative Volcano Power (VRP), with a maximum of 15 MW reported on November 28, which is considered moderate , according to data from the Observation of Volcanic Activity (Mirova) (http://www.mirovaweb.it/).
During the month of November there was continuous recording of earthquakes LP type, with an increasing trend, both in number and associated energy. Thus, the occurrence of volcano-tectonic seismicity events, of intermediate magnitude in two point periods, during the first days of the month, with locations 10 km south-south-east of the crater, at depths from 3 km. Another event was recorded, with a magnitude of 3.7 M, with an epicenter under the volcanic edifice. Values of RSAM and DR, which characterize the volcanic tremor signal, have undergone a clear change in their energy, reaching maximum values of 13 cm2, which represent a change in the dynamics of the volcanic system. The recording of an explosive and infrasonic activity reflects instability at the lava lake located in the crater, correlated with the ejection of incandescent materials into the crater surroundings. Finally, an increase in the number and intensity of satellite thermal warnings, reflect an increase in the activity of the lava lake.
All these antecedents indicate a subtle increase in the internal dynamics of the volcano, with possible emissions of materials in the crater area.
This morning, the National Service of National Geology and Mines (SERNAGEOMIN) reported, through the Volcanic Observatory of the Southern Andes (OVDAS), the change of the technical volcanic alert level of the volcano, passing it to Amarillo. In particular, since November 15 of the current year, a gradual increase in surveillance parameters has been detected, reflecting an increase in internal processes and therefore a more noticeable surface activity is observed
In addition, the energy of the seismic signal continues its upward trend, while recording a volcano-tectonic seismicity around the volcano. The increase in satellite thermal anomalies has ratified the surface presence of the lava lake and increased exposure of it, generating explosions from the lower levels of the crater, which have been detected through the monitoring network and different instrumental and visual techniques. This can potentially generate ash emissions and ballistic pyroclast emissions (lava splashes at high temperatures) in the vicinity of the crater.
In this regard, SERNAGEOMIN National Director, Mario Pereira, stated that « this volcano is monitored by 9 seismological stations, 4 GPS, 2 inclinometers, 4 IP cameras, 1 IR camera, 1 infrasound Microphone, 2 DOAS cameras and multigas, so that specialists have adequate technology to monitor volcanic activity. The important thing is that the different institutions of the civil protection system have technical information on what is happening, including the map of potential dangers, « the authority said.
As defined by the SERNAGEOMIN, the yellow alert level implies « Changes in parameters derived from monitoring that indicate that the volcano is above its threshold base and that the process is unstable and may evolve by increasing or by decreasing these levels. It can be recorded phenomena such as: seismic swarms (some of them are noticeable), ash emissions, lahars, morphological changes, noises, odors of volcanic gases, among others; this can alter the quality of life of people in the area of volcanic influence. «
Source : Sernageomin .
Photo : Werner Keller , Capturasur / Landscape
Ertaale , Ethiopia :
A German tourist has been shot dead and a guide injured during a visit to a volcano in north-eastern Ethiopia.
They were part of a group which had travelled to the Erta Ale volcano.
It is not known who carried out the attack, but the Ethiopian government has launched an investigation, the BBC’s Emmanuel Igunza reports.
The Afar region, which straddles the border between Eritrea and Ethiopia, is known as an operating ground for several separatist groups.
Five years ago, the Afar Revolutionary Democratic Front – the most prominent of the groups – claimed responsibility for the deaths of five tourists and the abduction of four others in the Afar region.
The group seeks the creation of an independent Afar homeland, which would include areas of Ethiopia, Eritrea and Djibouti.
Despite the risks, tourists continue to visit the volcano – found in the heart of the Danakil Depression, which sits at 410ft (125m) below sea level.
By some measures the Danakil Depression is considered to be one of the hottest places on earth, with an average reported temperature of 34.4C, but only 100 to 200mm of rainfall per year.
Added to this heat is the volcano, with its lava lake – one of only six in the world, according to this report from the BBC, making it one of the most inhospitable places on the planet.
Source : BBC
Photo : Georges Vitton
Klyuchevskoy , Kamchatka :
VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA).
Issued: December 05 , 2017
Volcano: Klyuchevskoy (CAVW #300260)
Current aviation colour code: ORANGE
Previous aviation colour code: green
Source: KVERT
Notice Number: 2017-258
Volcano Location: N 56 deg 3 min E 160 deg 38 min
Area: Kamchatka, Russia
Summit Elevation: 15580 ft (4750 m)
A gas-steam activity of Klyuchevskoy volcano on 03 December, 2017.
Volcanic Activity Summary:
A strong gas-steam activity of the volcano was observing on 02-05 December. Some amount of ash in the gas-steam plumes began to detecting from ~ 1100 UTC on 05 December. Activity of the volcano continues.
A gas-steam with some amount of ash activity of the volcano continues. Ongoing activity could affect low-flying aircraft.
Volcanic cloud height:
15744-16400 ft (4800-5000 m) AMSL Time and method of ash plume/cloud height determination: 20171205/2310Z – Video data
Other volcanic cloud information:
Distance of ash plume/cloud of the volcano: 106 mi (170 km)
Direction of drift of ash plume/cloud of the volcano: E / azimuth 92 deg
Time and method of ash plume/cloud determination: 20171205/2054Z – NOAA 18 (4m5)
Source : Kvert.
Photo : Yu. Demyanchuk, IVS FEB RAS, KVERT ,3/12/2017 .
Copahue , Chile :
Special Report on Volcanic Activity (REAV) of the Bio Bio Region, Copahue Volcano on December 5 , 2017, 23:30 Local Time (Continental Chile)
The National Service of Geology and Mines of Chile (Sernageomin) discloses the following information, obtained through the monitoring equipment of the National Network of Volcanic Surveillance (RNVV), processed and analyzed at the Volcanological Observatory of the Southern Andes. (OVDAS):
Today, Tuesday, December 5 at 22:45 local time (01:45 GMT), monitoring stations installed near the Copahue volcano recorded seismic volcano-tectonic events, associated with fractures of rocks. The characteristics of the earthquake of greatest energy are as follows:
TIME OF ORIGIN: 22:45 local time (01:45 GMT)
LATITUDE: 37.845 ° South, LONGITUDE: 71.074 ° West
DEPTH: 4.3 km
LOCAL MAGNITUDE: 4.0 (ML)
OBSERVATIONS
At the time of publication of this report, more than 20 volcano-tectonic earthquakes have been recorded.
Volcanic Technical Warning Level Remains at Level: Green Level
Sernageomin monitors online and informs on a timely basis of any changes in volcanic activity in the country.
Source : Sernageomin.
