Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

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 : #volcanic activity, #Sismologia
 Ebeko - photo Y.Demyanchuk / via RIA Novosti 22.06.2020

Ebeko - photo Y.Demyanchuk / via RIA Novosti 22.06.2020

A moderate eruptive activity is reported by KVERT to the Ebeko on June 21 and 22, 2020, observed by volcanologists from Severo-Kurilsk; it is characterized by explosions which are accompanied by ash plumes at more than 2,000-2,200 meters asl., drifting over 5 km towards the south of the volcano.

 

Source: KVERT - KSCNET & VAAC Tokyo

Sangay - photo archive IGEPN / Patricio Ramon

Sangay - photo archive IGEPN / Patricio Ramon

The levels of surface and internal activity of Sangay in Ecuador remain high, without change.

This June 21, the volcano remains hidden by the clouds, but the VAAC Washington reports gas and ash emissions at 570 meters above the crater, drifting west.

The SAGA seismic station recorded a high frequency signal which is surely associated with the descent of mudslides and debris (lahars).

This phenomenon has been recurrent since the start of activity in May 2019 and is due to the fact that the intense rains over the volcano remobilize the material accumulated during these months of activity. It is recommended not to be in the areas close to the banks of the Volcán and Upano rivers.

In the past 24 hours (20.06 to 21.06 / 11h), the IGEPN reports 8 LP earthquakes, 72 explosions and 8 episodes of emission tremor.

 2019.11.05 Reventador - photo archive IGEPN / Silvana Hidalgo 05.11.2019

2019.11.05 Reventador - photo archive IGEPN / Silvana Hidalgo 05.11.2019

At Reventador, the surface activity is moderate, the internal activity remains high on June 21, 2020.

The cloudiness prevents observation; the VAAC Washington reports during the night of June 20 an emission of gas and ashes at 1,338 meters above the crater, drifting towards the west.

Incandescence is observed at night during the thinnings, as well as falling blocks on the flanks of the volcano over 600 meters.

The IGEPN reports, for the last 24 hours, 23 LP earthquakes, 15 explosions, 5 episodes of emission tremor and 3 of harmonic tremor

 

Sources: IGEPN & VAAC Washington.

Kanlaon - photo Phivolcs

Kanlaon - photo Phivolcs

The Kanlaon Volcano seismic monitoring network recorded one hundred thirty-six volcano-tectonic earthquakes on the western flanks during the latest 24-hour observation period. Four (4) of these earthquakes at 1:01, 1:04, 1:34 and 2:06 were recorded at M3.2-4.7 by the Philippine Seismic Network and were felt at intensities II to V in La Carlota and Bago City, Negros Occidental and Canlaon City, Negros Oriental.

A moderate emission of white plumes loaded with vapor, reaching 200 meters in height, is observed above the crater, before drifting towards the southwest.

Sulfur dioxide emissions were measured at an average of 438 tonnes / day on June 13, 2020. Soil deformation data from continuous GPS measurements indicate inflation on average slopes since April 2020. These parameters indicate that a hydrothermal or magmatic activity occurs under the building.

 

DOST-PHIVOLCS would like to remind the public that the Kanlaon volcano is on alert level 1, which means that it is in an abnormal state and has entered a period of unrest. Local authorities and the public are strongly reminded that entry into the permanent danger zone (PDZ) with a radius of 4 kilometers must be strictly prohibited due to the additional possibilities of sudden and dangerous eruptions of vapor or phreatics.

Source: Phivolcs - 22.06.2020 / 8h

 Tjörnes Fracture zone - location of the seismic swarm and magnitude of earthquakes - Doc. IMO on 06.22.2020
 Tjörnes Fracture zone - location of the seismic swarm and magnitude of earthquakes - Doc. IMO on 06.22.2020
 Tjörnes Fracture zone - location of the seismic swarm and magnitude of earthquakes - Doc. IMO on 06.22.2020

Tjörnes Fracture zone - location of the seismic swarm and magnitude of earthquakes - Doc. IMO on 06.22.2020

The seismic swarm in the Tjörnes fracture zone in northern Iceland continues.

These swarms are common ... what is less so is the unusual high energy released, with more than 70 earthquakes of magnitude greater than 3, the largest reaching M 5.6 and 5.7. In total, the IMO has located more than 2,000 earthquakes since the start of this crisis.

He also reports considerable rock collapses in Tröllaskagi, but also accident reports in Malmö. A power outage in Kelduhverfi was also reported after the second earthquake.

There is a considerable risk of rock accidents and landslides on steep slopes in the northern fjords and on the Tröllaskagi and Flatey Islands. It is important that travelers in the mountains and those traveling in a steep country are aware of the danger of accidents and landslides.

Civil defense has declared the level of uncertainty in the northeast from the start of this seismic swarm.

 

The seismic swarm is still in progress and may move east along the Húsavík-Flateyjarm gang. Larger earthquakes cannot be excluded ... earthquakes of magnitude up to 7 are known in the Húsavík-Flateyjarmenggang. In 1872, there were two earthquakes of magnitude M6.5 and in 1755, an earthquake estimated at M7.

 

Source: IMO - Veðurstofa Íslands

 Tjörnes fracture zone - Rocks fall and landslides - photo 21.06.2020 Veðurstofa Íslands

Tjörnes fracture zone - Rocks fall and landslides - photo 21.06.2020 Veðurstofa Íslands

 NVZ / Northern volcanic zone map - with principal faults and historic earthquakes - via Gisli Olafsson

NVZ / Northern volcanic zone map - with principal faults and historic earthquakes - via Gisli Olafsson

Commenter cet article

Articles récents

Hébergé par Overblog