September 28 , 2016. EN. Piton de la Fournaise , Rinjani , Fuego , Turrialba.

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September 28 , 2016. EN. Piton de la Fournaise , Rinjani , Fuego , Turrialba.

September 28 , 2016.

 

Piton de la Fournaise , La Réunion :

Seismicity

Since the end of the eruption on September 18, 2016 and up September 25 (19:00 local time), the OVPF recorded a total of :

70 shallow volcano-tectonic earthquakes (0 to 2 km away under the surface) below the summit craters.

Deformation

Following the slight deflation (deflation) observed during the eruption, inflation (swelling) of the volcanic edifice is observed from September 18, meaning pressurization and accumulation of magma at depth. The rate of elongation summital (about 1 mm / day) is comparable to the rate observed in inflation phases in 2015 and 2016.

piton

Geochemistry of gas

For two days, the geochemical monitoring station at the top of the volcano recorded an increase concentrations of H2S and SO2 in the summital fumaroles.

Source : OVPF

Photo : Fabrice Conques.

Rinjani , Indonésie :

Results of the evaluation of visual and instrumental observation data of Gunung Rinjani, West Nusa Tenggara until September 27, 2016, given the explosive eruption that took place on a small scale and generated an ash column from Barujari peak at 14.45 pm.

I. Introduction … / …:

Historical development of the level of volcanic activity:
On October 25, 2015 13:00 pm, the G. Rinjani activity levels are raised from level I (normal) to the level II (Alert / Waspada). This is based on increased activity in the form of an ash eruption
On January 19, 2016 5:00 p.m.  the G. Rinjani activity levels are lowered from level II (Alert / Waspada) to the Level I (normal). This based on the reduction in seismic activity and the surface activity visually observed .

rinjani

II. observations

visual 2.1

In July 2016: Mostly sunny / cloudy, moderate wind from the west or east, air temperature 11 to 34˚ C. The volcano seems clear / fog.
As of August 1, 2016 11:40 p.m. : from the satellite Himawari: observation of the eruption of the crater Barujari inside the caldera of Rinjani. The eruption ash column moves to the South.
In September 2016: Mostly sunny / cloudy, moderate wind from the west or east, air temperature 13 to 34˚ C. The volcano seems clear / fog.

 

Rinjani 1 (270916)2.2 Instrumental

In July 2016: Registration of 35  events of tremor type with a maximum amplitude of 1 to 7 mm and a length of between 15 and 260 seconds, 34 events type earthquake low frequency   (LF), 18 events type earthquakes  volcanic (VA), 8 events type of local  tectonic earthquake (TL) and 54 events type earthquakes  far tectonic (TJ).

In August 2016: Recording of 69 events type tremors with a maximum amplitude of 1 to 8 mm and a length between 10 and 120 seconds, 56 events type earthquake low frequency   (LF), 8 events type earthquake volcanic (VA), 12 events type earthquake low volcanic  (VB), 13 events type earthquake local tectonic (TL) and 51 events type earthquake tectonic  distant  (TJ).

In September 2016, until the 26th: Recording of 34 type tremors events with a maximum amplitude of 2 to 5 mm and a length of between 15 and 110 seconds, 51 events type earthquake low frequency   (LF), 45 events type earthquake volcanic  (VA), 9 events like earthquake  shallow volcanic   (VB), 5 events type earthquake tectonic (TL) and 44 events type earthquake tectonic  distant   (TJ).

III. Evaluation

The level of seismicity of Rinjani before the eruption usually does not show a significant increase.
Visually, the cone of Barujani appeared not emit gases or other surface activity that may indicate an abnormality before the eruption.
Until now, it is still possible, as shown that the eruption continues , to see the emission type tremors recorded with a maximum amplitude of 2 to 5 mm and a length of 15 to 110 seconds.

 

IV. Potential Hazards:

The history of eruptive activity of G. Rinjani is characterized by explosive and effusive eruptions from the cone G. Barujari, in the center of the caldera of Rinjani.
In the history of activity, the eruption of Mount Rinjani shows a potential danger in the form of fall of ash and pyroclastic flows. The area potentially threatened by pyroclastic flow and ash fallout  is located inside the caldera, the ash can also spread around Mount Rinjani depending on the wind direction.
The threat of danger is not directly located in the northern area of Mount Rinjani, but especially in the watersheds of the Kokok Putih in the  open area of the crater. Inside the caldera , an eruption can cause an increase in water level of Lake Segara Anak, which also has the potential to cause flash floods in the river Kokok Putih.

 

rinjani

V. Conclusion

Based on the visual and instrumental analysis and taking into account the potential threat of danger, since September 27, 2016 at 15:00 pm the activity level of Rinjani is raised from level I (normal) to level II (Alert / Waspada).
Intensive surveillance is underway to assess the level of activity of Rinjani.

 

Source : VSI

 

Fuego , Guatemala :

During the last hours, the seismic activity of the station FG3, recorded an increase in power, paving the way for a new eruptive phase. The Observatory of the Fuego volcano, reported moderate to heavy explosions accompanied by ash plumes reaching a height of 4800 meters (15.748 feet) traveling more than 15 kilometers to the west and southwest and low to moderate sounds , similar to train locomotives.

fuego


An incandescent source from a height of 150 to 200 meters above the crater, feeding a lava flow to the Las Lajas Canyon with a length of 1,500 meters and causes light to moderate avalanches around the edge of the crater.
This eruption can increase in energy in the coming hours, with the probability of descent of pyroclastic flows by large canyons and cause falls of ash on the villages of the West and Southwest sides of the volcano.

fuego

Therefore, the INSIVUMEH recommends:
At CONRED: take the precautions it deems necessary due to the increased activity of the Fuego volcano.
At the Directorate General of Civil Aviation: We recommend taking precautions with air traffic, because the ash column reached a height of 4800 meters (15.748 feet) and travels over 15 kilometers to the West and the Southwest.
Tourist guides and tourists: do not climb to the crater because it has explosions that may generate fall of projectiles more than 2 kilometers from the crater.

Source : Insivumeh

 

Turrialba , Costa Rica :

Activity report of the Turrialba volcano
September 27, 2016, updated at 4:50 p.m. local time

The Turrialba volcano begins its 27 hours of continuous eruption. From 12:42 on September 26 at 14:50, 27 September 2016 he has mainly kept erupting continuously with passive emission of ash and gas through the West crater.

 

turrialba
From 13:30 to 2:50 p.m. a plume is observed, tend to be more vigorous and reach between 500 and 1000 meters above the crater (3940-5400 m.s.n.m.). It is important to note that a change is observed in the direction of the plume which is currently mainly to the West-Northwest as it is seen through the webcam of OVSICORI who managed to be restored this morning and according to weather data from the IMN (National Institute of meteorology) and the model for calculating the dispersion of gas and ash (AERMOD Chemistry Laboratory for Atmospheric LAQAT). Therefore, it is anticipated the possible dispersion of gases and ash to the WestNorthwest of the volcano and in the central valley.

During the day it was reported a smell of sulfur and ash falls in San Jose Moravia, Tibás, La Uruca, Guadalupe, La Sabana, Pavas, Granadilla Sabanilla Zapote, Goicoechea, the central canton San Pedro Montes de Oca , Desamparados, Santa Ana, Escazú; Heredia : San Isidro de Heredia and other parts of the Central Valley.

Volcanic gas and aerosols monitoring stations of OVSICORI-A, located on the campus of the Heredia National University have detected an increase during this afternoon in the concentration of fine acid particles suspended in the atmosphere , known as fine particles P10 (equal to or less than 10 microns) and PM2.5 (equal to or less than 2.5 microns).

The OVSICORI-A will issue a report every time there will be significant changes in the activity of the volcano.

 

Source : Ovsicori

Photos : Ovsicori

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