February 18 , 2017. EN. Lanin , Piton de la Fournaise , Nevado Del Huilà , Bogoslof , Barren Island .

Home / Alaska / February 18 , 2017. EN. Lanin , Piton de la Fournaise , Nevado Del Huilà , Bogoslof , Barren Island .

February 18 , 2017. EN. Lanin , Piton de la Fournaise , Nevado Del Huilà , Bogoslof , Barren Island .

February 18 , 2017.

Lanin , Chile :

Special volcanic report (REAV), Araucama Region. 15 February 2017,16: 55 hours (local time).

The National Service for Geology and Mines (SERNAGEOMIN) of Chile describes the following information obtained by the monitoring teams of the National Volcano Monitoring Network (NVNV), processed and analyzed at the South Volcanological Observatory of the South Andes (OVDAS):
On February 15, 2017 at 15:24 local time (18:24 GMT), there was a simultaneous succession of volcano-tectonic seismic (VT), long period (LP) and spasmodic tremors (TR) events intertwined with a predominance of events LP type. For volcano-tectonic earthquakes, the highest recorded energy up to now, a local magnitude (ML) of 1.8 was calculated. For its part, the most energetic long-period (LP) event had a calculated maximum displacement value (RDC) of 45 cm2, which is considered moderate.

 


At the time of this report a total of 59 earthquakes were recorded in 45 minutes.
Regarding the surface activity, no change was observed across the IP camera, located north of the volcano.
Seismic activity during the issuance of this report continues on the same pattern of occurrence. In the current scenario, it is possible that the evolution that occurs in the process may cause a destabilization of the volcanic system. Therefore, given the importance of this unusual swarm signal sequence on this type of volcano, the technical volcanic alert level is modified at AMARILLO, with particular attention to its evolution.
SERNAGEOMIN continues on-line monitoring and will report in a timely manner on changes in volcanic activity in the area.

 

Lanín is a large conical late-Pleistocene to Holocene stratovolcano along the Chile-Argentina border. The dominantly effusive basaltic-to-trachydacitic volcano lies at the eastern end of a NW-SE-trending volcanic group beginning with Villarrica that is transverse to the Andean chain. The beautifully symmetrical, 3776-m-high Lanín rises 2500 m above its base; shoulder areas on the upper flanks hint at a buried caldera. The volcano was formed in four eruptive stages dating back to the early Pleistocene or late Pliocene. The last two stages occurred during the late-Pleistocene and Holocene. A small lava dome at the summit fed blocky lava flows to the north about 2200 years ago. Lanín was reported active after an earthquake in 1906, but Sapper (1917) stated that newspaper accounts are strongly disputed, and no historical eruptions are known. A postglacial tuff ring (Volcán Arenal) is located below the SW flank in Argentina. A younger lava flow from Lanín covers deposits of Volcán Arenal and extends south into Lago Paimún.

Source : Sernageomin , GVP.

Photos : Camptocamp , Dave Mc Garvie.

 

Piton de la Fournaise , La Reunion :

Bulletin of 17 February 2017 – 17:00 local time

Piton de la Fournaise Volcanological Observatory

The eruption begun on January 31, 2017 at 7:40 pm local time continues. The volcanic tremor (surface eruptive indicator) remains at a high intensity level (Figure 1) despite a slight decrease since the beginning of the week.

(OVPF/IPGP)

 

Figure 1: Evolution of the RSAM (volcanic and volcanic eruption indicator) between January 31st and February 17th (5pm local time) on the seismic station of Château Fort, located on the southern flank of the volcano.

– No seismicity was recorded during the day under the summit of Piton de la Fournaise.

– No significant deformation has been observed in the last few days.

Observations carried out on the ground during the day by the observatory teams indicate that the activity is continuing mainly in « lava tunnels », with little change since yesterday. Only a few flows of small extensions were visible a hundred meters downstream of the eruptive cone.

 

Source : OVPF

Photo : Timaoul

Nevado Del Huilà , Colombia :

Subject: Weekly activity report of the volcano Nevado del Huila
The level of activity of the volcano continues: at activity level Yellow or (III): changes in the behavior of volcanic activity.

Analysis and evaluation of the information obtained by the monitoring network of the Nevado del Huíla volcano, the COLOMBIAN Geological Survey – Popayan Volcanological and Seismological Observatory reports that:

During the period evaluated, 82 seismic events, 59 of which were related to rock fracturing (VT type) and 23 with fluid dynamics in volcanic ducts were recorded. Of these, 21 were classified as long-period (LP-type) events and two (2) as low-magnitude pulses of tremor volcanic (type TR).
On the images obtained during the week by the webcams of Tafxnú, Maravillas, Caloto, La Palma and Verdun, a weak degassing of the volcanic system was observed.

 


The sensors for monitoring the deformation of the ground, magnetic fields and infrasonic waves have remained unchanged.
Therefore, it is concluded that during the evaluation period of the volcano, the volcano continued to exhibit stable behavior.
The Colombian Geological Service continues to be attentive and will report in a timely manner on any changes that may occur.

Source : SGC

 

Bogoslof , Aleutians Islands , Alaska :

Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Issued: Friday, February 17, 2017, 10:48 AM AKST
Source: Alaska Volcano Observatory
Notice Number:
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

 

Volcanic Activity Summary: ( 17/02)
A significant explosive eruption began at Bogoslof volcano at 18:55 UTC (09:55 AKST) today. Pulses of seismicity are continuing. Preliminary satellite data show an ash cloud, and lightning continues to be detected. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano.

Winds are from the south and will generally carry the ash cloud north over the Bering Sea.
Activity is ongoing and additional explosive events may occur. We will provide more information about the ash cloud as it becomes available.

Volcanic Activity Summary: (18/02)
Another short-lived explosive eruption occurred today at about 15:46 AKST (00:46 UTC) as detected in seismic and infrasound data. A volcanic cloud is visible in satellite and is as high as 25,000 ft asl. No lightning was associated with this event.

Seismicity as detected on nearby islands is back to low levels, but Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Additional explosions producing high-altitude volcanic clouds could occur at any time. Low-level explosive activity that is below our ability to detect in our data sources may be occurring. These low-level explosions could pose a hazard in the immediate vicinity of the volcano.

The Aviation Color Code remains at RED and the Alert Level remains at WARNING.

 

Source : AVO

 

Barren Island , Andaman et Nicobar Islands , India :

India’s only active volcano in the Andaman and Nicobar Islands is erupting once again. The Barren Island volcano, located about 140km northeast of Port Blair, started erupting in 1991 after a dormant phase of over 150 years and has shown intermittent activity since then.
A team of scientists led by National Institute Of Oceanography’s Dr Abhay Mudholkar said that the volcano is active and spewing smoke and lava once again.

 



Researchers from the NIO have sampled the sediments and water in the vicinity of the volcano and recovered coal-like black pyroclastic material representing proximal volcanic ejecta. Clouds were seen at the crater mouth where the smoke was bellowing out in an otherwise clear sky. These samples will help in deciphering the nature of the present and past volcanic activity in the region.
« We are seeing the composition of the lava and powdering the black sand to figure out what the components are, » Mudholkar told TOI.

Barren Island, a possession of India in the Andaman Sea about 135 km NE of Port Blair in the Andaman Islands, is the only historically active volcano along the N-S-trending volcanic arc extending between Sumatra and Burma (Myanmar). The 354-m-high island is the emergent summit of a volcano that rises from a depth of about 2250 m. The small, uninhabited 3-km-wide island contains a roughly 2-km-wide caldera with walls 250-350 m high. The caldera, which is open to the sea on the west, was created during a major explosive eruption in the late Pleistocene that produced pyroclastic-flow and -surge deposits. Historical eruptions have changed the morphology of the pyroclastic cone in the center of the caldera, and lava flows that fill much of the caldera floor have reached the sea along the western coast.

Source : Times of India

Photos : andamans.gov.in

 

 

Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Issued: Friday, February 17, 2017, 10:48 AM AKST
Source: Alaska Volcano Observatory
Notice Number:
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary:
A significant explosive eruption began at Bogoslof volcano at 18:55 UTC (09:55 AKST) today. Pulses of seismicity are continuing. Preliminary satellite data show an ash cloud, and lightning continues to be detected. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano.

Winds are from the south and will generally carry the ash cloud north over the Bering Sea.
Activity is ongoing and additional explosive events may occur. We will provide more information about the ash cloud as it becomes available.

 

 

 

India’s only active volcano in the Andaman and Nicobar Islands is erupting once again. The Barren Island volcano, located about 140km northeast of Port Blair, started erupting in 1991 after a dormant phase of over 150 years and has shown intermittent activity since then.
A team of scientists led by National Institute Of Oceanography’s Dr Abhay Mudholkar said that the volcano is active and spewing smoke and lava once again.

Researchers from the NIO have sampled the sediments and water in the vicinity of the volcano and recovered coal-like black pyroclastic material representing proximal volcanic ejecta. Clouds were seen at the crater mouth where the smoke was bellowing out in an otherwise clear sky. These samples will help in deciphering the nature of the present and past volcanic activity in the region.
« We are seeing the composition of the lava and powdering the black sand to figure out what the components are, » Mudholkar told TOI.

 

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