December 17 , 2017. EN. Stromboli , Kilauea , Agung , Guallatiri .

Home / agung / December 17 , 2017. EN. Stromboli , Kilauea , Agung , Guallatiri .

December 17 , 2017. EN. Stromboli , Kilauea , Agung , Guallatiri .

December 17 ,  2017.

 

Stromboli , Italy :

After the effusive eruption of August-November 2014, for more than two years the activity of Stromboli remained at very modest levels, and only in recent months, the volcano returned in its characteristic form, with frequent explosions of different mouths placed inside its crater terrace. In recent months, this activity has been interrupted by four major explosions (July 26, October 23, November 1 and December 1, 2017). After the last explosion, the explosive activity remained at a high level, to the point of motivating the authorities to declare the ban on access to the summit areas of the volcano.

 

Late yesterday, December 15, a change in the activity of the eruptive mouths was observed: one of them, located in the area of ​​the North crater, began to produce small projections, almost continuous, of flaps of fluid washes. This activity, known as « spattering », is often accompanied by the formation of small lava flows. Around 14:00 local time, a team of researchers and technicians of the Observatory Etneo, Catania section of the National Institute of Geophysics and Volcanology (INGV), observed that from two mouths, formed small lava flows , which began to fill the depression of the crater, inside which are the three active mouths. Around 14:30, the lava filled the depression and began to overflow on its northern edge, generating a lava flow that spilled on the northern slope of the Sciara del Fuoco. A few hours later, the activity of projection quickly decreased and at the end of the afternoon, the flow of lava stopped.

Figure: The first phases of the Stromboli lava overflowing on December 15, 2017, observed by the thermal cameras of Pizzo sopra la Fossa (left) and Quota 400 (right)

The lava overflows of the Stromboli crater terrace are not an unusual phenomenon. In the period between January 2010 and August 2014, there were several episodes of lava overflowing, some confined to the crater terrace, while others produced small lava flows on the upper slopes of the Sciara del Fuoco.

More rarely (eg in January 2013), flows have spread to the lower reaches of the Sciara and, in one case (August 7, 2014), a flow has reached the sea. As in this case, all these episodes ended after a few hours.
The phenomenon is constantly followed by the Etneo Observatory, the Observatory of Vesuvius and the INGV Section of Palermo.

Source : INGV

Photo : G Vitton

 

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:
Kīlauea Volcano continues to erupt at its summit and from the Puʻu ʻŌʻō vent on its East Rift Zone. The episode 61g lava flow is still producing scattered surface flow activity. These lava flows pose no threat to nearby communities at this time. The surface of the lava lake at Kīlauea’s summit was measured at 44 m (143 ft) below the floor of Halemaʻumaʻu crater yesterday and has decreased since that time. There have been no significant changes in ground deformation or seismicity rates across the volcano.

 

Summit Observations:
The lava lake surface was measured at 44 m (143 ft) below the rim of the Overlook Vent yesterday morning. Summit tiltmeters have continued to record deflationary tilt since that time. Summit sulfur dioxide emission rates remain high. Seismicity rates were at normal, background levels, with tremor fluctuations related to lava lake spattering.

Puʻu ʻŌʻō Observations:
No significant changes are evident at Puʻu ʻŌʻō. Glow has been persistent at long-term sources within the crater and from a small lava pond on the west side of the crater. The tiltmeter on Puʻu ʻŌʻō cone recorded deflationary tilt over the past day. The sulfur dioxide emission rate from the East Rift Zone vents has been steady over the past several months and remains significantly lower than the summit emission rate.

Lava Flow Observations:
The episode 61g flow is still active. Based on overnight web camera images, surface lava flow activity persists on the upper portion of the flow field, on the pali and in scattered areas along the coastal plain. A new breakout came over the pali Monday morning and continues. These lava flows pose no threat to nearby communities at this time. A plume from the Kamokuna ocean entry area was not seen in webcam views over the past 24 hours.

Source : HVO

 

Agung , Indonesia :

On the basis of the results of the visual and instrumental data analysis and considering the potential threats of danger, on November 27, 2017 at 06:00, the status of G. Agung was raised from Level III (SIAGA) to Level IV (AWAS) . Since yesterday and until today visually the volcano is clearly visible until the appearance of the mist. Eruptions and puffs of gray / white ash  , thick, of medium pressure, reach a height of about 500 to 1500 m above the summit and incline towards the West. At night, the glow of the incandescent lava in the crater of the volcano is observed.

Seismograph records as of December 16, 2017 have noted:
3 distant tectonic earthquakes
6 shallow volcanic earthquakes (VB)
5 deep volcanic earthquakes (VA)
No local tectonic earthquakes.
9 eruption earthquakes.
16 Low Frequency events.
26 earthquakes emission.
No harmonic tremor.
A continuous tremor with an amplitude of 1 to 2 mm and a dominant value of 1 mm.

As of December 17, 2017 (00:00 to 18:00) it has been registered:
9 emission earthquakes
No earthquakes of eruption.
5 low frequency earthquakes.
No shallow volcanic earthquakes (VB)
4 deep volcanic earthquakes (VA)
1 local tectonic earthquake.
No harmonic tremor.
A continuous tremor with an amplitude of 1 to 2 mm and a dominant value of 1 mm.

Recommendations:
Communities around G. Agung and mountaineers / visitors / tourists must not climb, climb or do any activity in the danger zone around the G. Agung crater area and in all areas within 8 km from the crater of G. Agung. With a sectoral extension to the North-East and South-East-South-South-West up to 10 km from the crater of G. Agung. The estimated area risks are dynamic and continuously assessed and can be modified at any time based on the most recent observational data from G. Agung.

Level IV (AWAS) is only valid for a radius of 8 to 10 km as mentioned above . Outside the activity area, everything can work as NORMAL and always SAFE

Source : VSI , Magma.

 

Guallatiri , Chile:

Special Report on Volcanic Activity (REAV), Arica and Parinacota Region, Guallatiri Volcano
December 15, 2017, 3:56 pm Local Time (Continental Chile)

The National Geological Survey and Mining Service of Chile (Sernageomin) publishes the following information, obtained from the surveillance equipment of the National Volcanic Monitoring Network (RNVV), processed and analyzed at the Volcanological Observatory of the Southern Andes . (OVDAS):
On 15 December 2017, at 15:12 local time (18:12 GMT), the monitoring stations installed on the Guallatiri volcano recorded a seismic swarm comprising 20 events associated with rock fractures (volcano-tectonics) during a time interval of 20 about minutes. The largest earthquake was located 6.6 km south-southeast of the main crater.

 

The characteristics of the earthquake of greatest energy are as follows:

Time of origin: 15:12 local time (18:12 GMT)
Latitude: 18.470 ° South
Longitude: 69.058 ° West
Depth: 7.2 km
Local Magnitude: M 3.8

Observations:
Before this major event, a fracture type earthquake (VT) with a local magnitude of M 3.5 was recorded. At the time of this report, the recording of events of less amplitude is continuing, but no changes in the surface are observed. The technical alert level is maintained at Green level.
Sernageomin continues online monitoring and will inform about changes in volcanic activity

Source : Sernageomin.

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