April 15 , 2017. EN. Etna , Poas , Nevado Del Ruiz , Kilauea , Dukono .

Home / blog georges Vitton / April 15 , 2017. EN. Etna , Poas , Nevado Del Ruiz , Kilauea , Dukono .

April 15 , 2017. EN. Etna , Poas , Nevado Del Ruiz , Kilauea , Dukono .

April 15 , 2017.

 

Etna , Sicily :

ETNA Activity Report, April 7-14, 2017

The episode of effusive activity described in the previous update ended on the night between 8 and 9 April 2017. A new effusive episode began from a vent still located at the southern base of the cone of South-East Crater (SEC) on Wednesday 10 April and lasted just over 24 hours. A stream of lava flowed southwest to the edge of the Valle del Bove and extended several hundred meters under the upper wall.

After three days of calm, on the evening of April 13, the opening of three effusive mouths on the southern side of the SEC cone and at its southern base marked the beginning of a new episode of effusive activity. The onset of the eruption was preceded by a sudden increase in the amplitude of the volcanic tremor and a brief explosive activity of the mouth located on the old « saddle » between the old and the new cone of the SEC. The picture on the left was taken shortly after the beginning of the activity of the lower mouth; We see the two lava flows fed by the first two mouths upstream and the beginning of the pouring from the third mouth downwards. The red dot in the upper right corresponds to the small « pit crater » which is open on the cone side on the old « saddle » at the end of March, which had been the seat of the explosive start of the new episode eruptive.

The most upstream of the eruptive mouths remained active for a few hours, emitting small lava flows which stopped after a few hundred meters, while the third mouth at the base of the cone remained effusive, feeding a lava flow to the south-east, in the direction of the Valle del Bove. On the morning of April 14, the front of this flow was on the western wall of the Valle del Bove, riding the flow of April 10-11.

Source : INGV

Photo : Piero Romano

 

Poas , Costa Rica :

Activity report of the Volcano Poas of 14/04/2017

On 14/04/2017 at 07:58 local time an eruption of the Poas volcano was recorded, the height reached by the column is unknown because the visibility of the site was not good.
Duration of the activity: Ongoing.

Ash falls reported in: There are no reports yet
Sulfur odor reported in: There are no reports yet

Comments: – At 07:58 a large phreatic eruption with about more than 500 meters high.

 

 Eruptions of April 14, 2017
After the phreatic eruption of 13 April at 15:46, Poas volcano exhibited small frequent eruptions during the night and the early hours of April 14th. Subsequently, at 7:48 and 7:58 in the morning, two major eruptions emitting a column of water vapor, gas, aerosols, and fine particles of acid lake sediments and more than 3 ash Km above the crater. Rock fragments up to 30 cm long, muddy sediments and lake water reached the Mirador area of ​​the visitors, while sediments and smaller particles of rock reached the National Park parking area . During the day activity was maintained with frequent minor eruptions, recorded in the afternoon, with an average of one eruption every 30-40 minutes. Between the eruptive events a constant, small amplitude, variable to moderate tremor remained. Low-frequency volcanic (LP) earthquakes continue to occur, but fewer in number than the previous days.
Under the current conditions of the Poas volcano, more short-term eruptions can be expected. OVSICORI-A remains vigilant on volcanic activity and will publish periodic reports on the evolution of its behavior and at each major change

Source : Javier Pacheco Alvarado et Maria Martinez Cruz , OVSICORI-A

Photo : Randall Villalobos S

 

Nevado Del Ruiz , Colombia :

The Colombian Geological Survey reports to the authorities and the community that today, on April 14, 2017 at 6:22 pm local time, a seismic signal has been recorded with a high level of energy related to the movement of fluids inside the volcano Nevado del Ruiz. This signal was associated with emissions of ash into the atmosphere, which was observed by the web cameras installed in the volcano area, with a maximum height of 1150 m above the top of the volcano.

imagen-nota-14abr.png

It can not be excluded from possible ash falls on populations that are in the direction of the wind regime, which is currently mainly northwest of the volcano, such as Manizales and Villamaría.

Source :SGC

 

Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
No significant change. Kīlauea Volcano continues to erupt at the summit and the Puʻu ʻŌʻō vent on its East Rift Zone. The episode 61g lava flow continues entering the ocean at Kamokuna, where a small lava delta has been growing since late March. Surface flows remain active above the pali. These lava flows pose no threat to nearby communities at this time. This morning, the lake surface was 23 m (75 ft) below the floor of Halemaʻumaʻu Crater.

 

Summit Observations:
Tiltmeters at Kīlauea’s summit recorded a switch to deflationary tilt just after midnight and the lake surface was measured at 23 m (75 ft) below the floor of Halemaʻumaʻu Crater this morning. Summit seismicity continues to be elevated since April 12th. Tremor amplitudes continues to fluctuate with the vigor of lava lake spattering. Summit sulfur dioxide emission rates from the lava lake remain high.

Puʻu ʻŌʻō Observations:
Webcam images over the past 24 hours showed persistent glow at long-term sources within the Puʻu ʻŌʻō crater and from a small lava pond on the west side of the crater. HVO visited Puʻu ʻŌʻō briefly Monday and noted no major changes. Seismicity was steady over the past 24 hours and ground tilt has not changed. The sulfur dioxide emission rate from all East Rift Zone vents was about 230 metric tons/day when last measured on March 21, 2017.

 

Lava Flow Observations:
The episode 61g flow was still active and entering the ocean at Kamokuna, where a lava delta is growing. No surface flows were visible on the coastal plain, but surface flows remain active on the upper portion of the 61g flow field above the pali, posing no threat to nearby communities at this time.

Source : HVO

Photo : David Ford , Bruce Omori

 

Dukono , Indonésia :

Volcano Observatory Notice for Aviation (VONA):

Last Issued: 20170413/2342Z
Current Aviation Color Code: ORANGE

     Volcanic Activity Summary:
Eruption with volcanic ash cloud at 2204 UTC (0704 local).
Volcanic Cloud Height:
Best estimate of ash-cloud top is around 5853 FT (1829 M) above sea level, may be higher than what can be observed clearly.

Source of height data: ground observer.
Other Volcanic Cloud Information:
Ash cloud moving to southwest.
Remarks:
Volcanic tremor recorded continuously.

Kegempaan Dukono

Conclusion:
The Dukono’s level of activity is Level II (Waspada)
Recommendation:
Communities around G. Dukono and visitors / tourists should not climb and approach the Malupang Warirang Crater within a radius of 2 km. Given the volcanic ash eruptions that occur periodically and the spread of ash that follows the direction of the wind, the areas affected by the ash are not fixed. It is recommended that people around G. Dukono wear a mask to cover their nose and mouth if necessary in order to avoid the danger of volcanic ash on the respiratory system.

Source : VSI

Photo :  M Rietze

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