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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 emissions have resumed in the last few days.
On 24 August, starting at 9:20 am, a changing color plume rose 700 meters above the crater, dispersing towards a western sector. The eruption continued at around 11 am.

  Poas - 24.08.2017, respectively at 9:21 am and 9:23 am - webcam RSN
  Poas - 24.08.2017, respectively at 9:21 am and 9:23 am - webcam RSN

  Poas - 24.08.2017, respectively at 9:21 am and 9:23 am - webcam RSN

From 17:47 local, a new eruption propelled an eruptive column at 1,000 meters above the crater.


During the morning of August 25th, the webcam images show three distinct mouths in the main crater, characterized by different behaviors: B-mouth, emitting the most, characterized by a gas plume containing water vapor ; The D / borbollon vent was characterized by bluish magma gas emissions, reaching over 300 ° C. ; Many fumaroles are visible in the crater.
The plumes disperse south and southwest.


Sources: Ovsicori and RSN

Poas - different plumes from 25.08.2017 / 6h43 - in the center of the picture, a hummingbird passes in front of the webcam - webcam Ovsicori

Poas - different plumes from 25.08.2017 / 6h43 - in the center of the picture, a hummingbird passes in front of the webcam - webcam Ovsicori

 Poas - 25.08.2017 / 9h01 - plumes and fumaroles animate the crater covered with ashes - Webcam RSN

Poas - 25.08.2017 / 9h01 - plumes and fumaroles animate the crater covered with ashes - Webcam RSN

A special technical report on the activity of Colima was issued by the University of Colima on 25 August.
From 5am. local time, seismicity increased, and a small explosion observed. It was followed by other explosos of low intensity, with seismicity characterized by LP and HF events.
Nebulosity prevents observation of the summit, but it is probable that a new increase of the dome has begun.
This increase in activity was preceded by observations of high frequency / HF earthquakes two weeks ago, some of which were located under the crater and in the vicinity of the volcano.


Source: RESCO-CUEIV-Faculty of Ciencias Universidad de Colima

 Colima - Seismogram of 25.08.2017 of the station SOMA to 1.7 km of the crater - Doc. RESCO-CUEIV-Faculty of Ciencias Universidad de Colima

Colima - Seismogram of 25.08.2017 of the station SOMA to 1.7 km of the crater - Doc. RESCO-CUEIV-Faculty of Ciencias Universidad de Colima

At Bogoslof, a lava dome was formed within the inner lake west of the 1992 lake. It was observed on 18 August, and expanded from 20-22 August to a diameter of 160 meters. A high surface temperature was measured and some plumes, mainly composed of steam, were occasionally observed.
On 22 August, two small explosions were recorded by the infrasonic system at around 12:10 UTC.
The aviation code remains in orange.
 
Source: AVO weekly report

Bogoslof - the 17.08.2017 / 11h35 - photo J.Schaefer AVO / NB: the new dome is not visible at this time.

Bogoslof - the 17.08.2017 / 11h35 - photo J.Schaefer AVO / NB: the new dome is not visible at this time.

In Sinabung, the usual activity continues: rapid growth of the lava dome, explosions accompanied by ash plume, and descent of small pyroclastic flow.


Sources: local observers

 Sinabung - growing dome - 22.08.2017 / 12h20 WIB - photo F.Surbakti via Beidar Sinabung

Sinabung - growing dome - 22.08.2017 / 12h20 WIB - photo F.Surbakti via Beidar Sinabung

Sinabung - 24.08.2017 / 10h43  - photo Endro Lewa

Sinabung - 24.08.2017 / 10h43 - photo Endro Lewa

Sinabung - 25.08.2017 / 9h16 - small pyroclastic flow - photo Endro Lewa

Sinabung - 25.08.2017 / 9h16 - small pyroclastic flow - photo Endro Lewa

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