September 09 , 2017.  EN. Villarica , Copahue , Sheveluch , Ambae .

Home / Ambae / September 09 , 2017.  EN. Villarica , Copahue , Sheveluch , Ambae .

September 09 , 2017.  EN. Villarica , Copahue , Sheveluch , Ambae .

September 09 , 2017.

 
Villarica , Chile :

Activity Report August 2017.
This month, the summit was visible for 9 nights, partially.
On 2 August, a reconnaissance was made on the crater (photo attached). At the bottom of the crater, a small incandescent orifice (arrow) was highlighted.
Seismic recordings reveal that on 20 August, the most vigorous strombolian explosion of the month occurred.
On the 30th, although the summit was reached, the strong prevailing wind prevented approaching the shores. Recent ashes and lapilli were observed scattered over the snow. During the morning, starting at 9:24 am, the volcano ejected ash and gas (sequence attached) to the east. The strong wind at high altitude prevented the vertical projection of the emission.

In total, four thousand eight hundred and fifteen (4815) seismic events were recorded, of which four thousand seven hundred and ninety-three (4793) were classified as long-term earthquakes (LP), related to fluid dynamics in the volcano, with reduced displacement values ​​(DRC) of less than 16 cm2. In addition, twenty-two (22) volcano-tectonic earthquakes (VT), associated with the fracturing of rigid materials, were classified; the highest energy event had a local magnitude (ML) equal to M1.4 and was located 9 km east-southeast (ESE) of the active crater at a depth of 4.8 km.

The series of volcanic tremors, a seismic series also associated with the dynamics of fluids inside the volcano, remained constant throughout the period, with an intensity whose mean displacement (DRC) was equal to 3 cm2, considered value while the dominant frequencies were preserved mainly between 1.0-2.1 Hz during the period.
Images recorded with IP cameras installed near the volcano, when permitted by weather, showed lower intensity and low altitude degassing, mainly whitish in color with sporadic ash emissions and nighttime incandescence. The heights of the columns did not exceed 150 m.
Based on data from five (5) GNSS stations monitoring deformation of the volcano, smaller displacements were detected in the horizontal and vertical components, showing magnitudes less than 0.4 cm / month. In addition, it can be seen that the length of the active control line which crosses the massif remains stable with rates less than 0.2 cm / month. On the other hand, data provided by two (2) Inclinometers show minimal variations, possibly influenced by climatic factors, not attributable to changes in the volcano’s internal activity.

No emission of sulfur dioxide (S02) into the atmosphere has been reported in the volcano sector, according to data published by the Ozone Monitoring Instrument (OMI) Sulfur dioxide group (http: //so2.gsfc. nasa.gov/) and the National Environmental Satellite Information and Data Service (NESDIS) (http://satepsanoine.nesdis.noaa.gov).
Thermal alerts were reported in the area associated with the volcano throughout the month, the highest alert was recorded on 30 August with a 45 MW Volcanic Radiative Power (VRP), considered to be moderate according to the data processed by the Middle Infrared Observation (MIROVA) (http://www.mirovaweb.it/) and near-real-time thermal monitoring of global hot spots (MODVOLC) (http://modis.higp.hawaii.edu/).
In August, volcanic activity remained at low and stable levels, with seismicity being mainly related to the dynamics of an active surface lava lake in an open duct volcanic system, generating smaller sporadic explosions with associated acoustic signals and lower ash emissions limited to the active crater and nocturnal incandescence. Under current conditions, the risk of ejection of pyroclastic material near the crater persists, which was detected in the images captured during the month.
The volcanic alert is maintained at:
GREEN LEVEL: Active volcano with stable behavior – No immediate risk – Time for a possible eruption: MONTH / YEAR.

Remarks: It is recommended to apply preventive restrictions to access an area of ​​500 m alongside the crater.

Source : Werner Keller / Equipe POVI , Sernageomin.

 

Copahue , Chile :

During this period, twenty-two (22) seismic events were recorded, seventeen (17) of which were classified as volcano-tectonic (VT), associated with rigid fracturing processes. Five (5) events associated with fluid dynamics within the volcano, classified as long period (LP) with reduced displacement values ​​(DRC) of 1 cm2, were recorded.
With regard to VT seismicity, local magnitudes (ML) were less than or equal to M1,4. The highest energy event was in a north-north-west direction (NNO) 5.6 km from the El Agrio crater with a depth of 1.6 km.

Throughout the period, a constant low-intensity tremor signal was recorded, mainly associated with the exit from the El Agrio crater. This signal had significant DRC values ​​of 0.5 cm2, with dominant dominant frequencies in two bands, one around 0.6 Hz and the other between 1.1 and 1.7 Hz.
According to the data provided by two active GNSS stations, no surface deformation attributable to changes in the internal dynamics of the volcano was observed.
The IP cameras installed near the volcano recorded a constant degassing of the active crater (El Agrio), characterized by sporadic ash emissions. The largest column was directed south-east (SE), with a maximum height of 400 m. For a few days, at night, an incandescence was observed when the climatic conditions allowed to observe the volcano.

 

No emission of sulfur dioxide (S02) into the atmosphere has been reported in the volcano sector, according to data published by the Ozone Monitoring Instrument (OMI) Sulfur dioxide group (http: //so2.gsfc. nasa.gov/) and the National Environmental Satellite Information and Data Service (NESDIS) (http://satepsanoine.nesdis.noaa.gov).
No thermal alerts were reported in the area associated with the volcano during the second fortnight, according to the data processed by the IRV observation portal (MIROVA) (http://www.mirovaweb.it/) and global hot spot monitoring (MODVOLC) (http://modis.higp.hawaii.edu/).
The energy of the volcanic process has decreased considerably, and although nocturnal incandescence (due to the remanent magma body in the passive degassing process) can be observed, the monitoring parameters and the development of the surface indicate that the volcanic system has reached a state of equilibrium. As a result, the technical alert level is changed to:
GREEN LEVEL: Active volcano with stable behavior – No immediate risk – Time for a possible eruption: MONTH / YEAR.

Note: As the passive degassing process continues, it is advisable to preventively apply access restrictions in an area near the crater with a radius of 500 meters.

Source : Sernageomin.

 

Sheveluch , Kamchatka :

 

VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)

Issued: .September 09 , 2017.
Volcano:Sheveluch (CAVW #300270)
Current Aviation Color Code:ORANGE
Previous Aviation Color Code:orange
Source:KVERT
Notice Number:2017-229
Volcano Location:N 56 deg 38 min E 161 deg 18 min
Area:Kamchatka, Russia
Summit Elevation:10768.24 ft (3283 m), the dome elevation ~8200 ft (2500 m)

 

 

Volcanic Activity Summary:
Explosions sent ash up to 5.7 km a.s.l., ash plume drift to the north from the volcano.
Explosive-extrusive eruption of the volcano continues. Ash explosions up to 32,800-49,200 ft (10-15 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

Volcanic cloud height:18696 ft (5700 m) AMSL
Time and method of ash plume/cloud height determination: 20170909/0635Z – Video data
Other volcanic cloud information:
Distance of ash plume/cloud of the volcano: 3 mi (5 km)
Direction of drift of ash plume/cloud of the volcano: N / azimuth 355 deg
Time and method of ash plume/cloud determination: 20170909/0635Z – Visual data
Start time of explosion and how determined: 20170909/0630Z – Video data
Duration of explosion: ~ 5 minutes

Source : Kvert.
Photo : Yu. Demyanchuck , IVS FEB RAS, Kvert

 

Ambae , Vanuatu :

AMBAE VOLCANO ALERT BULLETIN No9 issued by the Vanuatu Meteorology and Geohazards Department (VMGD) on 6th September 2017 at 7:33PM :

Volcanic activity at Ambae is continuing to increase. The Ambae Volcanic Alert Level is raised from Level 2 to Level 3.
This means that the Ambae volcano is in a minor eruption state. At this Alert Level, the volcanic activity is likely to continue to increase or decrease to its normal level of unrest at any time. The area of risk is within 3 km around the volcano and areas that expose to trade winds.

With this situation, villages and communities of Ambae Island, especially those in the prevailing trade winds direction will expect volcanic gas, ash falls and acid rain that may cause foliage fumigation hence damage garden crops.
It’s very important that communities, villages, visitors and travel agencies seriously consider this information.
The Vanuatu Meteorology and Geohazards Department will continue to closely monitor this volcano activity. More information will be provided as soon as necessary.

 

Aoba, also known as Ambae, is a massive 2500 cu km basaltic shield volcano that is the most voluminous volcano of the New Hebrides archipelago. A pronounced NE-SW-trending rift zone dotted with scoria cones gives the 16 x 38 km island an elongated form. A broad pyroclastic cone containing three crater lakes is located at the summit of the Hawaiian-style shield volcano within the youngest of at least two nested calderas, the largest of which is 6 km in diameter. Post-caldera explosive eruptions formed the summit craters of Lake Voui (also spelled Vui) and Lake Manaro Ngoru about 360 years ago. A tuff cone was constructed within Lake Voui about 60 years later. The latest known flank eruption, about 300 years ago, destroyed the population of the Nduindui area near the western coast.

Source : Geohazard , GVP
Photo : Traveloscopy travelblog

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