April 12 , 2017. EN. Planchon Peteroa , Dempo , Fuego , Cotopaxi .

Home / blog georges Vitton / April 12 , 2017. EN. Planchon Peteroa , Dempo , Fuego , Cotopaxi .

April 12 , 2017. EN. Planchon Peteroa , Dempo , Fuego , Cotopaxi .

April 12 , 2017.

 

Planchon Peteroa , Chile :

Planchon – Peteroa volcanic complex:

During the second fortnight of March, one hundred and thirteen (113) events related to fracturing of a rigid material, called volcanostectonic (VT), with a local magnitude (ML) of maximum 3.6 (for which a REAV was emitted ) have been recorded. These events were located mainly under the volcano, at depths between 4 and 7 km. The largest of these events was located 3.4 km north (N) of the main crater at a depth of 5.3 km
For events related to fluid dynamics, five hundred and seventy-four (574) LP-type events with local amplitudes (ML) of less than 0.9, with a reduced displacement value (RDC) greater than 2 , 3 cm, were classified.
CAMView images showed the presence of small, low-energy, whitish-colored fumaroles, especially on 29 March, and the heights of these do not exceed 100 m. at the level of the crater.

 

From the data obtained by three (3) GNSS stations measuring the deformation of the volcanic complex, minor variations in the two horizontal and vertical displacements were observed. With regard to the control line crossing the complex from north to south, this line was compatible with the stability recorded by the monitoring stations, showing low amplitude displacements. On the other hand, the data provided by one (1), electronic inclinometer installed in the volcanic complex, also show changes related to the morphology of the volcano.
Sulfur dioxide (S02) emissions into the atmosphere in the volcanic complex sector have not been reported, based on data from the Ozone Monitoring (SMI) Group Sulfur dioxide ( Http: //so2.gsfc.nasa gov /) and NESDIS (http://satepsanone.nesdis.noaa.gov).
No thermal alert in the area of ​​the volcanic complex has been reported, according to data obtained by the infrared observation (Mirova) on its site (http://www.mirova.it/)

Although the number of earthquakes has generally remained oscillating, with increases and decreases in seismic activity over the past two months, and there is no evidence of deformation of the volcanic system, seismic activity remains above basal levels, indicating the continuity of a dynamic process in the deep magmatic system of the complex, but without affecting the surface hydrothermal system. In this context, there is the possibility that a direct interaction between the two systems will develop, resulting in the generation of a low explosive activity in the first place, affecting areas close to active craters and / Low to moderate amplitude. It is therefore recommended to restrict access to the danger zone within a radius of 1 km around the crater and to maintain the level of volcanic alert at the level of:
YELLOW LEVEL: changes in the behavior of volcanic activity – probable time for an eruption : weeks / months.

Source : Sernageomin.

Photos : Sernageomin

 

Dempo , Indonesia :

Visual:

The results of the visual surveillance conducted from the PGA Dempo monitoring station at the summit of Mount Dempo in the period from 1 December, 2016 to 26 March 2017 showed:

January 2017. The weather was sunny – rain, no emissions of smoke.
February 2017. The weather was sunny – rain, no emissions of smoke.
1 to 26 March 2017. The weather was sunny – rain, puffs of fine white smoke, smoke ± 50 m high.
27 March to 4 April 2017. The weather was sunny – rain, puffs of fine white smoke, smoke ± 50 m high.

 

Seismicity:

In January 2017, 33 emissions, 3 shallow volcanic earthquakes (VB), 18 earthquakes (VA), 1 tremor earthquakes, 3 local tectonic earthquakes (TL) , And 23 Far Tectonic Earthquake (TJ).
In February 2017, it was recorded three shallow volcanic earthquakes (VB), five deep volcanic earthquakes (VA), and five earthquake tectonics (TJ).
From 1 to 20 March 2017, 13 earthquakes of emission, 10 shallow volcanic earthquakes (VB), 37 deep volcanic earthquakes (VA), 1 local tectonic earthquakes (TL) And 26 distant tectonic earthquakes (TJ).
From March 21st to 26th 2017, there were recorded 50 earthquakes, 2 tremor type (max 2 mm constant), 30 shallow volcanic earthquakes (VB), 88 volcanic earthquakes (VA) and 14 distant tectonic earthquakes (TJ).
From March 27 to April 4, 2017, 54 seismic events, tremor type events (constant 14 mm max), 28 shallow volcanic earthquakes (VB), 39 deep volcanic earthquakes (VA) and 14 tremors Of distant tectonic earth (TJ).

Evaluation :
The results of Dempo’s visual observation made since the PGA Post, from 21 March to 4 April 2017 shows bursts of thin white smoke, smoke ± 50 m high. Observation of the seismicity of Dempo in the period from March 21 to April 4, 2017, shows an increase from previous data.

 

Dempo 1 (050417)

Potential Hazards:

Phreatic eruptions in the form of emission and ash falls, mudslides can occur suddenly, within a radius of 3 km around the center of eruption.

Conclusion:

An increase in Dempo activity is indicated by visual data and seismic data.
Based on visual and seismic data, as of April 4, 2017, Dempo’s activity level is increased from Level I (normal) to Level II (Waspada) as of April 5, 2017 at 4:00 pm.

 

Dempo is a prominent 3173-m-high stratovolcano that rises above the Pasumah Plain of SE Sumatra. The andesitic Dempo volcanic complex has two main peaks, Gunung Dempo and Gunung Marapi, constructed near the SE rim of a 3 x 5 km caldera breached to the north. The one called Dempo is slightly lower, with an elevation of 3049 m and lies at the SE end of the summit complex. The taller Marapi cone, with a summit elevation 3173 m, was constructed within a crater cutting the older Gunung Dempo edifice. Remnants of 7 craters are found at or near the summit of the complex, with volcanism migrating to the WNW with time. The large, 800 x 1100 m wide historically active summit crater cuts the NW side of Gunung Marapi (not to be confused with Marapi volcano 500 km to the NW in Sumatra) and contains a 400-m-wide lake located at the far NW end of the crater complex. Historical eruptions have been restricted to small-to-moderate explosive activity that produced ashfall near the volcano.

Source : VSI , GVP

 

Fuego , Guatemala :

Activity type: Vulcanian
Morphology: Stratovolcan composite
Geographical location: 14 ° 28 ’54 ˝ Latitude N; 90 ° 52’54˝ Longitude W.
Altitude: 3,763 mn m.
Weather conditions: Clear
Wind: East 3 km / h
Precipitation: 0 mm.

Activity:
Weak white fumaroles at a height of about 4,300 meters (14,108 feet) to the west and southwest are reported. There were a total of about 18 small explosions generating columns of gray ash at a height of about 4,300 to 4,600 meters (14,108 to 15,092 feet), spreading westward, south and southwest on a distance  between 6 and 11 kilometers. These explosions are accompanied by weak sounds similar to aircraft turbines, with a duration of between about 4 and 9 minutes. At night, incandescent pulses are observed at a height between 100 and 150 m above the crater, generating weak avalanches on the contour of the main cone. These explosions produced ash falls in the areas of Panimaché I and II, Morelia, Santa-Sofia and others.

Source : Insivumeh

Photo : David Rojas

 

Cotopaxi , Ecuador :


SUMMARY OF THE VOLCAN ACTIVITY, Tuesday, April 11, 2017.

Volcano Status: Active
Internal Activity Level: Low
Surface Activity Level: Low

The activity of the volcano is weak. Overnight vapor emissions with a height of 200 m above the westward crater were observed. Currently, the area of the volcano is covered.

TECHNICAL APPENDIX AND OBSERVATIONS

Seismicity:
Since 11:00 am (TL) yesterday until 11:00 am (TL) today, 13 long period events (LP) have been recorded.
Observations:
Overnight vapor emissions with a height of 200 m above the westward crater were observed. Currently, the area of the volcano is covered.
Gas:
322 tonnes / day of sulfur dioxide were detected, with 27 valid measurements.
Rains and lahars:
Rains which did not generate lahars were recorded.

GENERAL INFORMATIONS
This report contains data and observations from 11:00 hours on the day before and 11:00 hours on the day of publication.
In the event of an increase or change in the behavior of the volcano, a special report will be published.

 

Source : IGEPN

Photo : J.L. Espinosa Naranjo

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