May 25 , 2017. EN. Poas , Turrialba , Rincon de la Vieja , Kilauea , Sheveluch , Piton de la Fournaise .

Home / blog georges Vitton / May 25 , 2017. EN. Poas , Turrialba , Rincon de la Vieja , Kilauea , Sheveluch , Piton de la Fournaise .

May 25 , 2017. EN. Poas , Turrialba , Rincon de la Vieja , Kilauea , Sheveluch , Piton de la Fournaise .

May 25 , 2017.

Poas , Turrialba , Rincon de la Vieja , Costa Rica :

Activity report of the Poas, Turrialba and Rincon de la Vieja volcanoes, 24 May 2017, updated at 11:00.

Poas: Volcanic activity in the last 24 hours.
During the last 24 hours, there was a moderate to weak tremor amplitude, and a series of small LP-type earthquakes of low amplitude. The RSN Webcam showed a strong continuous degassing with a steam column.
Until now, there have been no reported hydrothermal explosions (groundwater eruptions).


L’image contient peut-être : nuage, montagne, ciel, plein air et nature
At the time of this report, the winds at the top of the volcano are directed to the west and southwest.

Turrialba: volcanic activity in the last 24 hours.
During the last 24 hours, there was a moderate to moderate tremor amplitude. The tremor is continuous. There have been a number of small LP type earthquakes and a number of small VT type earthquakes. Thanks to the web camera, it recorded a strong continuous degassing with a column of water vapor, rising to a height between 500 and 700 meters from the bottom of the active crater.
So far, there has been no recorded or reported eruption and there have been no reports of ash falls.

L’image contient peut-être : 1 personne, ciel, montagne, nuage, plein air et nature

At the time of this report, the winds at the top of the volcano were headed west and northwest.

Rincon de la Vieja: volcanic activity in the last 24 hours.


This morning, water and hot steam emissions were reported at the top of the volcano seen from the Blue River Resort Hotel, north of the volcano.

OVSICORI-A remains vigilant on seismic and volcanic activity.

Source : Ovsicori

Photos : Mauricio Vargas Morales ( 1950) , Ovsicori , Mauricio Gutiérrez.


Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
No significant change. Kīlauea Volcano continues to erupt at its summit in Halemaʻumaʻu and at Puʻu ʻŌʻō on the East Rift Zone. This morning, the summit lava lake was about 17 m (56 ft) below the floor of Halemaʻumaʻu. The episode 61g lava flow continues to enter the ocean at Kamokuna. Active surface flows persist above, on, and near the base of the pali southeast of Puʻu ʻŌʻō. These pose no threat to nearby communities. Low rates of ground surface deformation and seismicity continue across the volcano.

Summit Observations:
Inflationary tilt continues this morning, marking the 4th day of inflationary tilt for the latest DI (deflation-inflation) event recorded at the Kīlauea summit. The summit lava lake has risen in concert with the ongoing inflationary tilt, and web cam images show that it is about 17 m (72 ft) below the rim this morning. This is high enough to be visible from Hawaii Volcanoes National Park’s Jaggar overlook. Generally, low levels of seismicity continue, with amplitudes of volcanic tremor fluctuating with the strength of lava lake spattering. Summit sulfur dioxide emission rates remain high.

Puʻu ʻŌʻō Observations:
Webcam images show glow at long-term sources within Puʻu ʻŌʻō crater and from a small lava pond on the west side of the crater. The level of seismicity at Puʻu ʻŌʻō has not changed significantly in the last 24 hours. Minor inflationary tilt has occured over the past few days, mirroring the summit tilt. The sulfur dioxide emission rate from the East Rift Zone vents has been steady over the past several months and remains significantly lower than the summit emission rate.


Lava Flow Observations:
The episode 61g flow remains active and is entering the ocean at Kamokuna. Growth of a new lava delta continues following the May 3 delta collapse, with narrow cracks observed on the delta running parrallel to the coast. Webcam views show surface activity within the 61g flow field above, on, and slightly beyond the base of the pali southeast of Puʻu ʻŌʻō. The flows pose no threat to nearby communities at this time.

Source : HVO

Photos : David Ford , Bruce Omori , HVO


Sheveluch , Kamchatka :

56.64 N, 161.32 E;
Elevation 10768 ft (3283 m),
the dome elevation ~8200 ft (2500 m)
Aviation Color Code is ORANGE

A growth of the lava dome continues, moderate explosions, fumarolic activity and incandescence of the dome summit and hot avalanches accompanies this process. A small pyroclastic flows were observed at the southern volcanic flank. Satellite data by KVERT showed an ash plume extended about 82 km to the east from the volcano.


Issued: 20170524/2245Z
Source: KVERT
Notice Number: 2017-91
Volcano Location: N 56 deg 38 min E 161 deg 18 min
Area: Kamchatka, Russia

Volcanic Activity Summary: Long ash cloud continues to drift to the east from the volcano.
Explosive-extrusive eruption of the volcano continues. Ash explosions up to 26,200-32,800 ft (8-10 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

Volcanic cloud height: 19680-21320 ft (6000-6500 m) AMSL
Time and method of ash plume/cloud height determination: 20170524/2150Z – NOAA 18 (4m5)
Other volcanic cloud information: Distance of ash plume/cloud of the volcano: 51 mi (82 km)
Direction of drift of ash plume/cloud of the volcano: E / azimuth 82 deg

Source : Kvert

Photo : Yu. Demyanchuk, IVS FEB RAS, KVERT


Piton de la Fournaise , La Reunion :


During the last 36 hours, 3 superficial volcanic tectonic earthquakes (<2 km deep) were recorded below the summit zone (Figure 1).


Figure 1: Histogram representing the number of superficial volcano-tectonic earthquakes recorded between May 18 and 23 (until 12 pm, local time), May 2017. (© OVPF / IPGP)


The deformations recorded on the permanent GPS stations of the OVPF seem to show a resumption of inflation (swelling) of the building. This trend will be confirmed in the coming days.


Gas Geochemistry

CO2 concentrations in the soil at the remote station of Plains of Cafres are stable at a high level.

Synthesis on the phase of 17 May 2017

The different measurements carried out on the ground in recent days have made it possible to highlight two new zones of fumaroles (one on the flow of September 2016 (photo 1) and the other on an older flows (on the left in the photo 2)). These zones are located on the path taken by the magma at depth (towards the northern flank, FIG. 2) confirming the arrival of the magma close to the surface and its degassing at the surface via so-called « dry » fractures, and at the origin of the tremor registered on May 17th.
These zones of fumaroles, as well as deformation and seismicity maps show that the magma has spread far enough, to the edge of the Enclos .


Figure 2: Map showing the location of the new fumaroles that appeared after the May 17 event (magma injection to the northern flank with the opening of « dry » fractures and degassing). Also shown are (1) the displacements of the soil associated with the magma injection of May 17, 2017. The vectors represent the horizontal displacements (max = 0.35 m) and the colored circles the vertical displacements (scale given by the color bar, Max = 0.35 m); And (2) the location of the seismicity recorded between May 17th and May 23rd (black circles). (© OVPF / IPGP)

Source : OVPF
Photo : Timaoul ( janvier 2017)
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