March 15, 2016. EN. Nyiragongo , Popocatepetl, Karangetang , Klyuchevskoy.

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March 15, 2016. EN. Nyiragongo , Popocatepetl, Karangetang , Klyuchevskoy.

March 15, 2016.

 

 

Nyiragongo , Democratic Republic of Congo.

Following the preliminary report of the Observatory of Goma, an Article of VolcanoDiscovery.

Nyiragongo volcano (DR Congo): fracture opens new vent inside crater – precursor of possible flank eruption? – VolcanoDiscovery

8 MARCH 2016. Some very unusual and alarming events have been taking place at the volcano recently: A new eruptive vent opened at the northeastern end of the lowest crater terrace, outside the active lava lake (which had been in place since 2002) and just beneath the near vertical crater walls.

According to a preliminary report of the Goma Volcano Observatory (GVO) who visited the volcano during 1-2 March, the new vent is now forming a second lava lake. Images from a visit of GVO staff show a spatter cone erupting fresh lava flows that pooled onto the crater floor.

 

nyiragongo

GVO reported that since the end of February, activity at the volcano has been more intense than usual. In particular, starting from 04 am on 29 February, local inhabitants began to hear frequent rumblings coming from the volcano almost every minute.

Likely, these were caused by the opening of the new dike (fracture occupied as pathway for the new magma) and associated rockfalls inside the crater (the vent is directly located near almost vertical walls). It is important to note as GVO’s report mentions, that the location of the new vent is on the east-trending fracture zone that connects the summit vent of Nyiragongo with the prominent flank cone Baruta to the northeast of the main edifice, near the village of Kibumba.

This rift zone (along with the southern rift zone extending towards Goma town) is one of the most prone locations of the volcano’s dangerous flank eruptions.

 

When these occur, the volcano’s edifice is ruptured laterally, allowing magma to drain outside. Such eruptions have been occurring at intervals of few decades typically. They usually drain very large volumes of very fluid, and hence, unusually fast flowing lava from the lake in short time. The results of the past two such eruptions in 1977 and 2002 were catastrophic: they killed more than 1000 people, destroyed dozends of villages and a large part of Goma town (in 2002).

Whether or not the current developments are precursor of a new eruption from Nyiragongo’s flanks is difficult to say, but the appearance of the new vent tells that an extensional movement has taken place on this fracture zone, something that is certainly alarming.

 

Source : Volcanodiscovery .

Photo : Alessandro Ronzoni, Bradley Ambrose/Caters news agency

 

Popocatepetl , Mexico :

March 14, 11:00 h (March 14, 17:00 GMT)

In the last 24 hours the seismic records of the surveillance system at Popocatépetl volcano registered 114 low-intensity exhalations, and 9 explosions; five yesterday at 10h07, 12h40 , 13h18  , 20h00 and 21h01  and four today at 02h10  , 03h42 , 07h30   and 09h42. Through visual monitoring system shows that the winds dispersed emissions preferentially northeast. Besides 324 minutes low amplitud harmonic tremor.

 

popocatepetl

Along the night was observed slight incandescence increasing when main exhalations . From dawn and up to the time of this report it has been noticed a faint emission of steam and gas the winds dispersed emissions preferentially northeast.

CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater, due to the hazard caused by ballistic fragments .
This type of activity is included within the scenarios Volcanic Traffic Light Yellow Phase 2.

 

Source : Cenapred .

Photo : Karel Del Angel

 

Karangetang , Indonesia :

EVALUATION

During the period from February to 13 March 2016, the G. Karangetang visually showed his incandescent lava dome at a height between 10 and 25 meters. From the main crater, white / blue, thin smoke, moderately high of about 25-150 m. He did not produce avalanche flow.

Seismicity is dominated by volcanic earthquakes shallow (VB), remote seismic tectonic events (TJ) , volcanic earthquake. Many tend to decrease, compared to the period from December 2015 to January 2016. The growth of the lava dome is still in progress, which is still characterized by the earthquake and tremor registration phases, with a maximum amplitude of 0.5 mm. Therefore, lava eruptions may occur in the coming days.

 

 

karangetang

From the graph of volcanic energy earthquakes and seismic amplitude spectra from early February until 13 March 2016 this model seems stable, but was still higher than the normal value.
Satellite MODIS did not observe hot spot since March 8, 2016 indicating that the arrival of magma to the surface is not too large.

CONCLUSION
The results of the analysis and evaluation of visual and instrumental data until March 13, 2016 show a decrease in the level of activity. So the level of volcanic activity of Mount Karangetang is lowered from LEVEL III (Siaga) to LEVEL II (Waspada) this March 14, 2016 at 15:00 pm.
Intensive supervision is maintained to evaluate the activity of G. Karangetang and is being coordinated with the local government (DPDT regions).
The level of activity will be reevaluated if there is a change in volcanic activity and adapted to the level of the threat.

 

Source : VSI

Photo : Iyan Mulyana, 2007

 

Klyuchevskoy, Kamchatka :

 

56.06 N, 160.64 E;
Elevation 15580 ft (4750 m)
Aviation Color Code is YELLOW

A moderate activity of the volcano continues. Ongoing activity could affect low-flying aircraft.

A strong gas-steam activity of the volcano continues. Satellite data by KVERT showed a weak thermal anomaly over the volcano on 05 and 08 March; the volcano was quiet or obscured by clouds in the other days of week.

klyuchevskoy

Klyuchevskoy (also spelled Kliuchevskoi) is Kamchatka’s highest and most active volcano. Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity. It rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif. More than 100 flank eruptions have occurred during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation. The morphology of the 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century. Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.

Sources : Kvert , Gvp.

Photo : Yu. Demyanchuk. IVS FEB RAS, KVERT

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