December 21 , 2016. EN. Bogoslof , Aso , White Island , Ruapehu , Fuego .

Home / Alaska / December 21 , 2016. EN. Bogoslof , Aso , White Island , Ruapehu , Fuego .

December 21 , 2016. EN. Bogoslof , Aso , White Island , Ruapehu , Fuego .

December 21 , 2016.


Bogoslof , Iles Aleoutiennes, Alaska :

AVO/USGS Volcanic Activity Notice
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED . Actually : Orange

Issued: Tuesday, December 20, 2016, 5:20 PM AKST
Source: Alaska Volcano Observatory
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians


AVO Image

Volcanic Activity Summary:
A short-lived explosive eruption of Bogoslof volcano was reported by several pilots around 0100 UTC (4:00 pm AST). They reported a volcanic ash cloud rising to an estimated altitude of 34,000 ft (10.3 km). Satellite data show a discrete, short-lived explosion just prior to 0100 UTC that detached and drifted to the south by 0115 UTC. A subsequent pilot report from 0150 UTC indicated that activity had decreased.

On the basis of this information, the Aviation Color Code is increased to Red and the Volcano Alert Level to Warning. There is no ground-based volcano monitoring equipment on Bogoslof volcano so AVO is unable to provide a forecast of future eruptive activity. We will monitor satellite images and data from distant seismic and infrasound instruments for indications of significant explosive activity.



Bogoslof 1994. , Tom Miller.

Volcanic Activity Summary: Issued: Tuesday, December 20, 2016, 9:05 PM AKST

The explosive eruption of Bogoslof volcano that occurred today at about 00:35 UTC (3:35 pm AKST) was short-lived, lasting approximately 30 minutes, and produced a detached ash cloud that rose to 34,000 ft (10.3 km) above sea level as reported by several pilots. A subsequent pilot report from 01:50 UTC (4:30 pm AKST) indicated that activity had decreased and the cloud was dispersing. The ash cloud was carried southward over the Gulf of Alaska and no ash fell on inhabited areas. No further explosions have been detected in seismic and infrasound networks indicating that the activity has subsided. No activity is apparent in recent nighttime satellite images.

On the basis of this information, the Aviation Color Code is lowered to ORANGE and the Volcano Alert Level to WATCH.

Some previous eruptions of Bogoslof have lasted for weeks to months, and further explosive activity could occur with little warning. Mariners in the area should use caution.

Source : AVO

Photo : Tom Miller


Aso , Japan :

Volcanic alert level for Mount Aso is lowered

20 DECEMBER 2016. The Meteorological Agency has lowered its alert level for Mount Aso in Kumamoto Prefecture, citing diminished volcanic activity following its explosive eruption in October.
With no major eruptions observed since then, the Meteorological Agency on Tuesday lowered the alert level for the 1,592-meter peak from 3 to 2 on the 5-point scale. Under level 2, people are advised people not to approach the crater.
“A small-scale eruption could still occur and vigilance is needed against ejection of large ash deposits and pyroclastic flows within a 1-km radius of the crater,” the agency said.



The alert level was downgraded because the amount of volcanic gas emission has fallen this month and only small volcanic earthquakes have been observed recently, officials said.
Mount Aso erupted at around 1:46 a.m. Oct. 8, spewing volcanic ash up to 10,000 meters into the sky. Ash falls were observed in Kumamoto, Oita and Ehime prefectures.
The agency believes a magma vapor eruption occurred when underground water came in contact with magma.

Source :   JAPAN TIMES

Photo :


White Island , Ruapehu , New Zealand :

White Island (Whakaari)

On November 21 we completed a gas flight at White Island, where we measure sulphur dioxide (SO2), carbon dioxide (CO2) and hydrogen sulphide (H2S). The gas output was down slightly on the October flight. The sulphur dioxide (SO2) has ranged 230-420 tons per day, carbon dioxide (CO2) 1240-1730 tons per day and hydrogen sulphide (H2S) 15-35 tons per day.

white island

The main vent(s) were less audible than in October, still producing a transparent plume at the base/vent which evolved into a vivid white steam plume. There is no lake. Over the last 2-3 months the small lake let on the crater floor was disappeared to leave 5-6 small depressions, some have water ponded in them. The water levels are variable as are the colours of the pools, some are grey and active, others blue/green and passive. We estimated the water levels varied by 2-3 m.

A levelling survey was completed on December 20 to ascertain the amount of ground deformation across the crater floor. Changes show subsidence (20 mm+) focused on the active crater area. Fumarole ‘Zero’ remains very hot, we measured 182 °C. It was 178 °C in October.

We used drones to obtain photography of the active crater area so we can build a new map. We also sampled the gases from the main gas plume using a drone. Maintenance was also completed on the web cameras.



On December 17 we completed a gas flight at Ruapehu, our first successful flight for months. We measure sulphur dioxide (SO2), carbon dioxide (CO2) and hydrogen sulphide (H2S). The gas output was up slightly on the August flight. The sulphur dioxide (SO2) has ranged 19-22 tons per day, carbon dioxide (CO2) 240-640 tons per day and hydrogen sulphide (H2S) 0.6-1.6 tons per day since July.



The Crater Lake was visited to sample the water and collect gases on December 20. The lake temperature was 21.7 °C. Lake was a battleship grey colour with more blue grey water near the lakeshore due to meltwater going into the lake. The central vent was very slightly distinguishable in the right light conditions. The north vent area had a lot of sulphur slicks nearby.

Lake level appeared to be on the high side (summer melt) and the flow at the outlet was estimated at 60-80 L/sec.

Crater Lake temperature has been cooling since early October, when it reached 40 °C. For the last 2-3 weeks it has been around 24-22 °C.


Source : Geonet .


Fuego , Guatemala :

The eruption No.16 of the volcano Fuego persists with an incandescent source which reaches a height of 300 meters above the crater, feeding three flows of lava, the first one in direction of Santa Teresa Canyon, reaching a length of 2,000 meters, the second to the canyon Taniluyá, with a length of 1,800 meters and the third towards the canyon Trinidad with a length of 600 meters. Moderate to strong avalanches are noted on the outline of the crater.
The volcano observatory reports moderate and strong explosions, ejecting ash plumes at an altitude of about 4,500 to 5,000 meters (14,763 to 16,404 feet) traveling more than 15 kilometers to the south, southwest, West and North-West. Ash falls are reported in nearby areas: Panimaché, Morelia, Hagia Sophia, Sangre de Cristo, San Pedro Yepocapa, among other areas near the volcano. There is a possibility that the ash will move a greater distance, mainly to the areas of Santa Lucia Cotz, given the variability of the wind.
There are constant, moderate sounds, like the engine of a train locomotive, constant rumblings of moderate to very sensitive character in the volcanic perimeter, generating moderate shock waves. The eruption maintains its energy and there is a possibility that pyroclastic flows are generated, so it is not recommended to stay in or near the main canyons.


Therefore, INSIVUMEH recommends:
To CONRED: to take the precautions it deems necessary because of this new eruptive phase, given the lack of electricity in areas like Morelia and Panimache.
In the Directorate General of Civil Aviation: We recommend taking precautions with air traffic, because the ash column reaches a maximum height of about 5,000 meters (16,404 feet) and moves to the West, South West and South.
Tourist agencies and tourists: The explosive activity of the Fuego can generate ballistic falls on the « meseta », so it is recommended not to stay or camp in this area.

Source : Insivumeh

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