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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
 Poas - 06.07.2017 - degassing of two vents and fumaroles on the crater floor - photo Blas Enrique Sanchez via R.van der Laat

Poas - 06.07.2017 - degassing of two vents and fumaroles on the crater floor - photo Blas Enrique Sanchez via R.van der Laat

In Poas, the observatory records an abundant degassing from two active mouths, as well as gas emissions throughout the crater floor. The plumes rise vertically between 200 and 600 meters above the floor of the crater, and then are scattered grazingly by the prevailing winds from west to south. A strong odor of sulfur is seen in Cantón Central, Grecia, Zarcero, Naranjo. También en Heredia, Barva and San Rafael.
This activity resulted in a small eruption on 6 July at 15:45 local time, accompanied by a plume 400 meters above the crater.
 
Source: Ovsicori

Poas - 06.07.2017 - degassing at the level of two vents - photo Blas Enrique Sanchez via R.van der Laat

Poas - 06.07.2017 - degassing at the level of two vents - photo Blas Enrique Sanchez via R.van der Laat

In Sabancaya, despite announcements by the OVI-Ingemmet of a slowdown in activity of the volcano, thermal images record explosions and the emission of large quantities of ash.
 
Source: OVI - Ingemmet / Peru

Sabancaya - explosion on 05.07.2017, respectively at 20h09 and 20h 11 - thermal camera OVI-Ingemmet
Sabancaya - explosion on 05.07.2017, respectively at 20h09 and 20h 11 - thermal camera OVI-Ingemmet

Sabancaya - explosion on 05.07.2017, respectively at 20h09 and 20h 11 - thermal camera OVI-Ingemmet

Villarica's monthly activity is marked by a noticeable increase during a field visit on 5 June. Lava spatters and dark ash deposits can be seen on the chimney and on the edge of the crater covering by snow. 
The magnitude 5.1 earthquake of June 23 disrupted Villarica's dynamics: on the summary seismograph (bottom right), the red line marking the mean amplitude of the seismic noise slowly descends until it reaches its minimum level in the hours before the earthquake; It rises again after June 23, to recover its usual level. At the same time, during the night of 23-24 June, the cameras recorded a marked increase in the intensity of the incandescence of the lava well.
On 1 July in the morning, the vigor of the strombolian explosions increased, with the expulsion of spatters 60 meters above the summit around 7:10 local.
 
Source: Werner Keller / POVI

Villarica - summary in photos of the activity during the month of June - photo POVI / Werner Keller -  a click to enlarge

Villarica - summary in photos of the activity during the month of June - photo POVI / Werner Keller -  a click to enlarge

The inclement weather in Guatemala has spawned lahars at the Santiaguito and Fuego.
In the Santiaguito, the lahar concerns the Rio Cabello de Angel, a tributary of the Rio Nima I; It is 30 meters wide, 1 meter high, and carries a lot of fine and pasty materials as well as blocks of 50 cm to 1 meters in diameter.
Concerning the Fuego, the drainage concerned is the barranca Santa Teresa and the Rio Mineral; It is a hot lahar, generating steam and carrying fine sediments, trees and blocks of one to three meters. Traffic is disrupted locally.
 
Source: Insivumeh

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