September 05 , 2017. EN. Fernandina , Sabancaya , Bárðabunga , Poas , Turrialba .
September 05 , 2017.
Fernandina , Galápagos , Ecuador :
The last time the volcano erupted was in April 2009. Its eruptions affect the species that live in the area and are characterized by explosions that destroy the caldera, emit ash, gas columns and flows of lava that project into the sea.
The volcano La Cumbre is a basaltic shield volcano (1,476 m.s.m.) with a caldera of 5 x 6.5 km. It is located on the westernmost island of the archipelago in the middle of the Pacific Ocean, about 1,000 kilometers from the mainland and Ecuador.
NEW ERUPTION OF THE VOLCAN FERNANDINA – GALÁPAGOS
After eight years of superficial calm, the Fernandina volcano began a new eruptive phase on September 4, 2017, around 12:25 (Galapagos time), as seen in the photographs taken in the vicinity of the volcano and sent by park staff Galapagos (Figure 1).
Figure 1: Fernandina volcano eruptive column of September 4, 2017 (Source: Galapagos National Park).
The seismic network of the Galapagos Geophysical Institute began to detect activity on the volcano around 9.55 (Galapagos time). At 1428 satellite images were reported showing the presence of an eruptive column originating from the volcano and moving west-north-west at an altitude of about 4000 m above sea level. crater (Figure 2)
Figure 2: false color satellite image, where the eruption column from the Fernandina volcano is observed (Source: http://goes.higp.hawaii.edu/cgi-bin/imageview?sitename=galapagos).
It should be noted that Fernandina Island has no human colonies that could be affected by an eruption. Depending on the direction of the wind, the eruption column should not affect the populations of Puerto Ayora, Pto. Villamil or Pto. Baquerizo, located to the south and east of the volcano.
With regard to the development of this event, the IG will continue to report.
Source : IGEPN , Avcan.
Photo : Antonio Adrián , Parque Nacional Galápagos.
Sabancaya , Peru :
An average of 44 explosions / day was recorded, similar to the previous week. The predominance of events associated with fluid movements (long period) and, to a lesser extent, events related to ash emissions (Tremor) is continuing. Earthquakes associated with magma uplift (hybrids) are low in number and energy
The eruptive columns of gas and ash decreased from the previous week, reaching a height of about 3200 m above the crater and dispersing within a radius of more than 40 km, mainly in a southeasterly direction and from South.
During this period, the GPS station located to the South-East of the volcano showed a tendency of deformation in the north-east direction.
The flow of volcanic gas (SO2) recorded a maximum of 3329 tonnes / day on 30 August, considered moderate.
The MIROVA system recorded 5 thermal anomalies, with values between 3 MW and 11 MW of VRP (Irradiated Volcanic Energy).
In general, eruptive activity maintains moderate levels. This type of behavior can continue over the next few days.
Source : IGP
Photo : Archive IGP
Bárðabunga , Iceland :
Geothermal Heat Forms Giant Holes in Glacier.
4 SEPTEMBER 2017. Over 400 meter (1312 feet) wide holes have formed in Vatnajökull, Iceland’s largest glacier. RÚV reports. This is near the Bárðarbunga area, which had a volcanic eruption between 2014 and 2015.
According to geologist Magnús Tumi Guðmundsson, the entire Bárðabunga landscape changed after the eruption, with increased geothermal heat that has melted away a hundred meters of thick, glacial ice, forming these calderas.
IMAGE: This newly formed hole shows land that’s been buried under ice for hundreds, or even thousands of years.
In fact, this marks the first time in hundreds or even thousands of years that the ground beneath the glacier can be seen. Magnús Tumi warns that this increases the chances of a glacial outburst flood, although nothing can be confirmed as of yet.
Seismic activity in Bárðarbunga has been high for the past years, due to its last eruption. Magnús Tumi says the area needs to be carefully watched in order to watch out for any more calderas that might trigger a glacial outburst flood.
Source : Iceland Rewiew , Jeannie Curtis
Photo : Screenshot from RÚV video
Poas , Turrialba , Costa Rica :
Report on the activity of the Poás and Turrialba volcanoes on 4 September 2017. Updated at 11:00 p.m.
Volcano Poas: activity over the last 24 hours.
Over the past 24 hours, Poas Volcano has exhibited some low ash emission pulses. The gas plume is scattered mainly westward.
Volcan Turrialba: activity over the last 24 hours.
Over the past 24 hours, the Turrialba volcano has exhibited some isolated VT events and short, low amplitude tremor periods. During the night, impulses emitted a little ashes.
The dispersion of the gas plume was towards the west.
(VT type events: discrete seismic signals on volcanoes, high frequency, produced by changes in the internal pressure of the volcano and subsequent fracture of the rock).
The OVSICORI-UNA is vigilant on seismic and volcanic activity.
Source : Ovsicori
Photos : Archive Ovsicori