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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

Pacaya's internal tremor has increased in the last 48 hours.
 

Pacaya - RSAM 24 hours - Doc.Insivumeh

Strombolian-type explosions are accompanied by shock waves that vibrate the roofs. The extruded incandescent materials reach 50 to 200 meters high above the crater, and form a cone of slag that collapses continuously by avalanche of blocks.

The Insivumeh reports a lava flow that descends through the crack of the 2010 eruption towards NE about 500 meters.

The usual behavior of Pacaya augurs a new lava flow.

Source: Insivumeh, special volcanological bulletin of 28,04,2018 / 10h local 20h.

Pacaya - archive 18.04.2018, where 4 flows were present- photo J. Luis mejicanos via Pacaya volcano FB

Pacaya - archive 18.04.2018, where 4 flows were present- photo J. Luis mejicanos via Pacaya volcano FB

At Piton de La Fournaise, the eruption continues despite a decline in various parameters.

The lava flow from the vents below the craters Rivals and Kalla goes to the wall of the Enclos Fouqué, encircling the crater Cassian.

A significant thermal anomaly is recorded by the Mirova site.

Sources: OVPF, local media and Mirova

 Piton de La Fournaise - the plume is still visible from the Piton Bert's camera - 29.04.2018 / 7h48 UTC

Piton de La Fournaise - the plume is still visible from the Piton Bert's camera - 29.04.2018 / 7h48 UTC

Piton de la Fournaise - the lava flow encircles the Crater Cassian before continuing towards the Rempart - photo 28.04.2018 Imazpress

Piton de la Fournaise - the lava flow encircles the Crater Cassian before continuing towards the Rempart - photo 28.04.2018 Imazpress

Piton de la Fournaise - thermal anomalies of the days of activity - Doc Mirova Modis 28.04.2018 / 19h20

Piton de la Fournaise - thermal anomalies of the days of activity - Doc Mirova Modis 28.04.2018 / 19h20

Turrialba maintains a relatively low level of seismic activity characterized by the sporadic recording of low-amplitude long-term earthquakes (LPS) and very low amplitude and very short duration tremor. Volcano-tectonic earthquakes and small to moderate to near-crater earthquakes are recorded discretely and with time intervals between discrete events of hours or more than 1 day.

Turrialba - low plume of gas and steam on 28.04.2018, respectively at 7:59 and 8:59 loc. - Ovsicori webcam
Turrialba - low plume of gas and steam on 28.04.2018, respectively at 7:59 and 8:59 loc. - Ovsicori webcam

Turrialba - low plume of gas and steam on 28.04.2018, respectively at 7:59 and 8:59 loc. - Ovsicori webcam

Gas flow, aerosols and heat
The flow of magmatic gases, aerosols and heat through the western crater continues in a moderate and passive (non-explosive) form. The weak plume of water vapor, gas and aerosols is about 500 meters above the summit, which is richer in magmatic gas, apparently in the eastern sector of the west crater.

Influence of the volcanic plume on the ambient air
During today's day, the plume of water vapor, magmatic gases and aerosols has been dispersed by the prevailing winds to the area southwest of the volcano, ie to the east and north of Carthage, the central valley, and the central pacific.

From April 26, 2018, a moderate emission of sulfur dioxide gas was detected by NASA's IMO satellite, from the Turrialba volcano with a dispersal direction towards the northwest region. In addition, instruments from the Ovsicori-una volcanic aerosol and gas monitoring station at surface level in Coronado-San José also detected significant levels of SO2 in the air on April 26, exceeding the daily average daily values, which frequently oscillates around 1 and 2 PBBs.

According to the pollutant pollutant distribution rose, this gas detected at Coronado comes mainly from the North-East-East-South-East, that is to say from the plume of the Turrialba volcano.

Source: OVSICORI

 

Turrialba - profile of concentrations of sulfur dioxide in ambient air, and zone of dispersion of this gas for 26 - 27 April - Doc Ovsicori station Coronado

Turrialba - profile of concentrations of sulfur dioxide in ambient air, and zone of dispersion of this gas for 26 - 27 April - Doc Ovsicori station Coronado

Yellowstone's largest geyser, the Steamboat geyser, erupted three times in six weeks: March 15, April 19, and April 27.

According to data from the USGS and seismic stations at the University of Utah, this "aqueous eruption" began at 6:30 am local time.

A probe of temperature, installed after the eruption of March 15, recorded about 60 ° C on April 19, and temperatures that have remained in these standards ever since.

A vigorous vapor phase was observed for a couple of hours after the eruptive phase.

Yellowstone N.P. - "Aqueous" Eruption of Steamboat Geyser on April 27 - NPS photo

Yellowstone N.P. - "Aqueous" Eruption of Steamboat Geyser on April 27 - NPS photo

The amplitude of the seismic signals of the April 2018 episodes was greater than during the March episode ... the set of 2018 signals remaining lower than those characterizing the water eruptions of 2013 and 2014. (see diagram)

Source: YVO / University of Utah

Steamboat geyser - amplitude of seismic signals during different dated aqueous eruptions - Doc. USGS / Utah Univ.

Steamboat geyser - amplitude of seismic signals during different dated aqueous eruptions - Doc. USGS / Utah Univ.

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