June 02 , 2016. EN. Santiaguito , Yellowstone , Turrialba , Masaya .

Home / blog georges Vitton / June 02 , 2016. EN. Santiaguito , Yellowstone , Turrialba , Masaya .

June 02 , 2016. EN. Santiaguito , Yellowstone , Turrialba , Masaya .

June 02 , 2016.



Santiaguito , Guatemala :

Volcanological Special Bulletin

Strong explosion on the Santiaguito volcano

Activity type : Peléenne.
Morphology : Complex dacitic domes
Geographical location: 14 ° 44 ’33 « N Latitude 91 ° 34′ 13 » W. Longitude
Height: 2500m.



The period of activity of the Santiaguito volcano continues to generate strong explosions. Today was generated two powerful explosions, both with ash plumes that reached about 4900 m, which have moved to the Northeast, the Southeast and the Southwest, out at distances between 30 and 40 km, with the probability that the most fine ash, within a few hours, are transported further.








These explosions occurred without sound or rumbling.
The areas likely to be affected by ash falls are the villages of San Marcos and Loma Linda, Palajunoj , Finca El Faro, Patzulin , El Patrocinio, the cities of El Palmar, San Felipe, Las Marias and others in this zone.
This period of explosive activity of the Santiaguito volcano is one of the most violent in recent years.
So there is the possibility of generating more violent eruptions, as or greater than that of May 9, 2014.










Therefore, INSIVUMEH recommends:
Note that the activity of the Santiaguito volcano remains high, with the ability to generate similar or larger explosions. It is therefore necessary to take precautions deemed necessary and maintain the necessary vigilance.
At The Ministry of Health,
Note that the Loma Linda and San Marcos Palajujoj villages are the most affected by ash falls steadily, which can cause problems on the respiratory tract, stomach problems and affect the view of the people.


To take precautions with air traffic, as there is ash in the atmosphere over a distance of 30 kilometers to the Northeast, Southeast and Southwest of the volcanic perimeter, at an altitude of 4900 meters above the sea level, with the potential to be transported further.
Also take into account changes in the wind direction, because the ash can be transported in different directions over a greater distance

Source : Insivumeh.

Photos : Volcan Santiaguito , Gaby Gutierrez , Leonel Castillo .


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

During May 2016, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 72 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a micro earthquake of magnitude 2.5 on May 27, 02:02 PM MDT, located 7 miles northeast from West Yellowstone, MT.
May 2016 seismicity did not include any earthquake swarms. Yellowstone earthquake activity in May is at low background levels



Ground deformation
Uplift at the Norris GPS station (NRWY), which began in early 2016, continues at a rate of ~5 cm/yr. The pattern of ground deformation in the Norris area resembles that observed from late 2013 through early 2014, although the present uplift rate is less than half of what it was before. Caldera GPS stations continue to record slow subsidence at a rate of ~1.5 cm/yr.

Current deformation patterns at Yellowstone remain within historical norms.

An example of GPS data can be found at http://www.unavco.org/instrumentation/networks/status/pbo/data/WLWY (click on Static Plots / Time Series)

The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.


Source : YVO


Turrialba , Costa Rica :

10,025 ° N, 83,767 ° W
Summit :  3340 m

Volcan Turrialba continues its degassing

The National Emergency Commission (CNE) said the Turrialba volcano continues with its abundant degassing, since last May 27, when the emission of ash ceased.
The image was captured in a flyover by Ana Lucia Garita, geodesta the Volcanological and Seismological Observatory of Costa Rica (OVSICORI), held on Monday in conjunction with the National Seismological Network (RSN) and geologists of the CNE, Blas Sanchez and Julio Madrigal .



The flyby was aimed to visualize the morphological changes of the active crater, perform thermal measurements with remote camera, assess the assess of the accumulation of ash on the flanks of the volcano, pastures, streams and impoundments.

Experts determined that much of the material from eruptions has been washed by the rains of recent days. The volcano shows the same behavior for several days, when on May 27 at 2:30 a.m. output decreased ash.

The volcano maintains a discrete signal, being recorded on the RSN seismic stations, which also reflects the continuing the upward movement of fluids. Moreover, the surveillance cameras installed by OVSICORI show passive degassing in an area that not above the crater and is scattered towards the West, this consists mostly of water vapor.


OVSICORI-UNA reported that a strong explosion detected at Turrialba at 2145 on 24 May generated ash plumes that rose 3.5 km above the volcano and drifted SW. The event ejected large rocks around the crater. About one hour later ashfall was reported in multiple areas, including Santa Rosa de Oreamuno, Santa Cecilia de Heredia, and San Francisco de Heredia. At 0015 on 25 May tremor amplitude increased, and at 0030 explosions ejected abundant amounts of ash and incandescent rocks. At 0812 a gas-and-ash plume rose 500 m above the active craters. Large amounts of ash (deposits 2-7 mm thick) fell in the several neighborhoods in the towns of Carthage, Heredia (38 km W), San José (70 km W), and Alajuela (49 km W). Tremor was continuous throughout the day but the amplitude had decreased by 1900. Ash emissions continued, with plumes rising 500 m above the volcano. Tremor decreased at around 0200 on 27 May; emissions likely did not contain ash, which was confirmed at dawn. Ashfall and a strong sulfur odor was reported by residents of Aquiares (11 km SSE), Santa Cruz de Turrialba (8 km SSE), and central Turrialba. Seismicity remained low during 28-31 May, and gas emissions from the crater persisted.

Source : La Prensa , GVP .

Photos : Ana Lucia Garita , Emmy Durán.


Masaya , Nicaragua :

Volcan Masaya dawns with gas column

The Masaya Volcano woke up with a large plume of gas that surprised the villagers living around the volcano. The volcano has maintained activity in recent months, forming a lava lake, a fact that has drawn international media attention.

In addition, there has been a series of earthquakes that have spread to the area of the sierritas. Even the seismic swarm occurred yesterday south of Managua could be linked to the activity of the volcano. Masaya volcano closed to the public preventively due to seismic activity on Tuesday.



Masaya volcano, 23 kilometers southeast of Managua, is one of the most attractive tourist destinations in Nicaragua reached by car because it allows its main crater, the Santiago, which now features a lake of lava, of recent formation.


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