June 23 , 2017. EN. Nevados de Chillan , Yellowstone , Ebeko , Fuego , Poas , Turrialba .

Home / blog georges Vitton / June 23 , 2017. EN. Nevados de Chillan , Yellowstone , Ebeko , Fuego , Poas , Turrialba .

June 23 , 2017. EN. Nevados de Chillan , Yellowstone , Ebeko , Fuego , Poas , Turrialba .

June 23 , 2017.


Nevados de Chillan , Chile :

During the period, 756 seismic events were recorded, 31 of which were classified as volcano-tectonic (VT) events in relation to rock fracturing processes, with maximum local magnitudes of M 2.1. The largest amplitude earthquake was located 4.4 km south-east of the active crater at a depth of 4.1 km. Similarly, 725 earthquakes were associated with fluid dynamics under the volcano , of which 669 were classified as long-term events (LP), with reduced displacement values ​​(DRc) of 48.6 cm2. In addition, tremor (TR) earthquakes were recorded with maximum displacement values ​​(DRc) of 16.7 cm2. Finally, 6 long-period events, known as « tornillos », were recorded in relation to the high impedance contrasts produced by the transit of magmatic and / or hydrothermal fluids within magmatic conduits. The event of greater amplitude reached reduced displacement values ​​(DRc) of 1.1 cm 2

Between 1 and 5 June, a total of 23 intermittent explosions were recorded, continuing the explosive phase of the previous month of the  volcanic complex of Nevados de Chillan.
The images obtained by the cameras installed near the volcanic complex showed between June 1 and 5, columns associated with explosions around the currently active craters, then, from 6 to 15, emissions of low-energy steam . Their heights were nearly 300 meters on average, with the exception of June 5 where the maximum height was 2200 meters.
According to data obtained from five (5) GNSS stations measuring the surface deformation of the volcano, no significant variation was observed. The lengths of the control lines crossing the active craters showed variations less than 0.1 cm / month, which does not suggest any relevant changes on the volcano. The data presented by the electronic inclinometer lead to the conclusion that there are no important processes related to the internal dynamics of the volcano.

Emissions of sulfur dioxide (SO2) recorded by the Chillan station, differential absorption spectrometry, located 2.6 km from the southeast of the active crater, have a monthly mean value of 1461 t / day and a maximum value of 4819 t / day reported on June 14th. There was an increase in SO2 emissions from previous months, remaining within a moderate range.

No sulfur dioxide (S02) emissions to the atmosphere have been reported, according to data published by the Ozone Monitoring Instrument (IMO) Group of Sulfur Dioxide (http: //so2.gsfc. Nasa.gov /).
No thermal alerts were reported in the area associated with the volcano according to data processed by the Mirova system (http://www.mirovaweb.it/).

The explosion phase, which began on 29 May, ended on 5 June, passing through a passive degassing period of whitish color, low energy and without the development of explosions and / or ash emissions. In general, the volcanic complex shows a behavior of transitions between explosive and non-explosive periods, which was characteristic of the process initiated in 2016.
It is suggested that the interaction between the surface hydrothermal system and the magmatic activity has decreased, generating fewer explosions and medium to low column heights. However, in view of the dynamic behavior of the system, it is possible to see the appearance of new explosions similar or even intensities higher than those recorded. Therefore, the level of technical volcanic alert remains at the level:
YELLOW LEVEL: changes in the behavior of volcanic activity – probable time for eruption: weeks / months.

Note: Due to the energy of the process, it is recommended to maintain the volcanic high-risk area with a radius of 3 km around the active craters.


Source : Sernageomin

Photos :  Archives sernageomin / volcanes de chiles.


Yellowstone , United – States :

44°25’48 » N 110°40’12 » W,
Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

The University of Utah, a YVO member agency, sent out the following update about the ongoing earthquake swarm north of West Yellowstone.



The University of Utah Seismograph Stations (UUSS) is monitoring an earthquake swarm which is currently active on the western edge of Yellowstone National Park. The swarm began on June 12th, 2017 and, as of 13:30 MDT on June 19th, 2017, is composed of 464 events with the largest magnitude of ML 4.4 (MW 4.4) .


The swarm consists of one earthquake in the magnitude 4 range, 5 earthquakes in the magnitude 3 range, 57 earthquakes in the magnitude 2 range, 238 earthquakes in the magnitude 1 range, 157 earthquakes in the magnitude 0 range, and 6 earthquakes with magnitudes of less than zero. These events have depths from ~0.0 km to ~14.5 km, relative to sea level. At the time of this report, there were 115 felt reports for the M4.4 event that occurred on June 16, 2017 at 00:48:46.94 UTC (June 15, 2017 at 18:48:46.94 MDT). The M4.4 event has an oblique strike-slip moment tensor solution .




Earthquake swarms are common in Yellowstone and, on average, comprise about 50% of the total seismicity in the Yellowstone region.

This is the highest number of earthquakes at Yellowstone within a single week in the past five years, but is fewer than weekly counts during similar earthquakes swarms in 2002, 2004, 2008 and 2010.


Source : YVO


Ebeko , Kamchatka :

50.69 N, 156.01 E;
Elevation 3792 ft (1156 m)
Aviation Color Code is ORANGE

A moderate gas-steam with some amount of ash activity of the volcano continues. Ash explosions up to 16,400 ft (5 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft and airport of Severo-Kurilsk.



Ash burst from Active crater of Ebeko volcano on 17 June, 2017.

A moderate explosive activity of the volcano continues. According to the data by observers from Severo-Kurilsk (Paramushir Island, Northern Kuriles), several ash bursts up to 2 km a.s.l. occurred on 17 and 21 June; the volcano was obscured by clouds in the other days of week. Satellite data by KVERT showed the volcano was quiet or obscured by clouds.


Source : Kvert

Photo : L. Kotenko, IVS FEB RAS



Fuego , Guatemala :

Type of activity: Vulcanian
Morphology: Stratovolcan composite
Geographical location: 14 ° 28 ’54 « Latitude N; 90 ° 52′ 54˝ Longitude W.
Altitude: 3,763m.
Weather Conditions: Partly Cloudy
Wind: N at 5 mph
Precipitation: 46.3 mm.

Persistence of an activity of white-colored degassing fumaroles which rise to a height of 4,300 m
They are scattered south, southwest and west. The volcano generates low to moderate explosions, 2 to 3 per hour, emitting plumes of gray ash at a height of about 4,500 to 4,800 meters (14,764-1,5748 feet). They are scattered 8 to 10 km to the south, southwest and west. These explosions are accompanied by weak to moderate rumblings with weak shock waves Incandescent pulses at heights of 100-150 m generate moderate avalanches in the Santa Teresa, Taniluya, Ceniza and Trinidad gullies. Some reach the edge of the vegetation.

Source : Insivumeh

Photo : Sergio Emilio Montufar Codoner



Poas , Turrialba , Rincon de la Vieja , Costa Rica :

Activity report of the Poas, Turrialba and Rincon de la Vieja volcanoes, 21 June 2017, updated at 10.30 am.

Volcano Poas: Volcanic activity in the last 24 hours.

During the eruptions yesterday, the presence of ash persisted throughout the day. The tremor signals are of low amplitude. Webcam enabled us to observe yesterday afternoon, a red plume, which could be due to the presence of elements such as iron, but to confirm when they will be analyzed.


L’image contient peut-être : nuage, ciel, montagne, plein air et nature

In the morning, a solid continuous degassing with a column of water vapor, magmatic gases, little ash and aerosols (very fine particles of sulfur, sulphates, silica, drops of sulfuric acid) was observed from the main mouths exposed to the atmosphere after the almost complete dewatering of the acid lake, reaching a height of less than 500 meters above the crater.
During the afternoon yesterday, a strong odor of sulfur was reported in Grecia, Naranjo and Poas.

At the time of this report, the winds at the top of the volcano are variable, but are mainly directed to the southwest.

Volcan Turrialba: Volcanic activity in the last 24 hours.

Over the last 24 hours, low and medium range tremors have been observed. There have been a number of LP and VT type earthquakes. The webcam allowed to observe a degassing with a variable force and a column of water vapor, magmatic gases and aerosols, with a height of less than 500 meters from the bottom of the active crater.
Ash emissions were present with little force and in small amounts.


L’image contient peut-être : 1 personne, montagne, ciel, nuage, plein air et nature

At the time of this report, the winds at the top of the volcano are mostly southwest.

Volcano Rincon de la Vieja: volcanic activity in the last 24 hours.
The seismograms show a tremor of very low magnitude.

OVSICORI-A remains vigilant on seismic and volcanic activity.


Source : Ovsicori


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