June 29 , 2017. EN. Poas , Turrialba , Rincon de la Vieja , Stromboli , Ulawun , Kilauea .

Home / blog georges Vitton / June 29 , 2017. EN. Poas , Turrialba , Rincon de la Vieja , Stromboli , Ulawun , Kilauea .

June 29 , 2017. EN. Poas , Turrialba , Rincon de la Vieja , Stromboli , Ulawun , Kilauea .

June 29 , 2017.

 

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

Activity report of the Volcanoes Poas, Turrialba and Rincon de la Vieja, 28 June 2017, Update of 11h00.

Volcano Poas: volcanic activity in the last 24 hours.

During the last 24 hours, continuous tremor seismic signals of moderate amplitude were observed. Only a few small LP events can be distinguished from the tremor. The camera showed a strong continuous degassing with a column of water vapor, magmatic gases and aerosols (very fine particles of sulfur, sulphates, silica and droplets of sulfuric acid) through the two main mouths exposed to the atmosphere after desiccation of the acid lake, reaching heights of approximately 1000 m. But often, the volcano is covered with clouds and / or emissions and visibility is low. This morning the column can be seen from Alajuela, Savannah, Sarchi, Heredia, Guadalupe, Uruca, Pavas, Escazu, San Jose, Curridabat, Tibás, Bethlehem, Barva, Coronado, Fraijanes, Sabanilla Montes de Oca, Santa Ana and Grecia .

 


28 June 2017. Dr. Javier Pacheco, who is conducting fieldwork with Dr. Geoffroy Avard took this image of Poas volcano. Two main mouths emitting materials are observed, the yellow color is due to a compound of sulfur and red, to sulfur compounds that can be at different states of oxidation.

An eruption at 08:00 (local time) and 8:55 is recorded. The column of magmatic ashes and gases reached a height of 2000m. The eruption is in progress, but now the cameras are covered with clouds. There have been no reports of ash falls.

At the time of this report, the winds at the top of the volcano are variable, but are mainly directed to the west.

Volcan Turrialba: volcanic activity in the last 24 hours.

During the last 24 hours, tremors of low amplitude have been observed. At 08:00 (local time), the amplitude of the tremor increased, and varied between low amplitude and moderate amplitude. There were a number of small LP and VT type events of low amplitude. The camera showed degassing with variable force and a column of water vapor, gases and magmatic aerosols at a height of about 500 to 1000 meters from the bottom of the active crater. This morning, the degassing can be seen from Guápiles, Escazu, San José and Santo Domingo.

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

So far, there has been no recorded or reported eruption and no ash falls have been reported. At night it was possible to see the active crater glowing.

At the time of this report, the winds at the top of the volcano are very variable, but especially towards the northwest.

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

There were three very weak seismic signals over the last 24 hours, each lasting less than one minute, which may be related to fluid movement. No rash has been reported.

The OVSICORI-A closely follows the seismic and volcanic activity.

 

Source: Ovsicori

 

Stromboli ,  Aeolian Islands , Italy :

 

38.789°N, 15.213°E
Elevation 924 m

INGV reported that during 22-26 June explosions at the N1 vent, one of two vents that comprise Stromboli’s N Area, ejected material as high as 200 m above the vent. Explosive activity at the second vent, N2, ejected tephra 150 m high that fell within the crater terrace as well as beyond the crater rim. Intense spattering at N2 was noted on 26 June.

 

Explosions from the N Area vents occurred at a rate of 10-14 events per hour. Vent C in the CS Area discontinuously puffed, and spattering also occurred on 26 June. Explosions from the S1 vents (also part of the CS Area) ejected tephra 150 m high. Explosions from the CS Area occurred between 5 and 10 events per hour.

Source : GVP

Photo : Photovolcanica

 

Ulawun, New Britain, Papua New Guinea:

5.05°S, 151.33°E
Elevation 2334 m

RVO reported that during 1 May-23 June white plume rose from Ulawun. Seismicity was low (and dominated by small low-frequency earthquakes) although RSAM values slowly increased and then spiked on 13 June. Ash emissions began on 11 June and then became dense during 21-23 June. Based on analyses of satellite imagery, the Darwin VAAC reported that during 24-26 June ash plumes rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted W.

The symmetrical basaltic-to-andesitic Ulawun stratovolcano is the highest volcano of the Bismarck arc, and one of Papua New Guinea’s most frequently active. Ulawun volcano, also known as the Father, rises above the north coast of the island of New Britain across a low saddle NE of Bamus volcano, the South Son. The upper 1000 m of the 2334-m-high Ulawun volcano is unvegetated. A prominent E-W-trending escarpment on the south may be the result of large-scale slumping. Satellitic cones occupy the NW and eastern flanks. A steep-walled valley cuts the NW side of Ulawun volcano, and a flank lava-flow complex lies to the south of this valley. Historical eruptions date back to the beginning of the 18th century. Twentieth-century eruptions were mildly explosive until 1967, but after 1970 several larger eruptions produced lava flows and basaltic pyroclastic flows, greatly modifying the summit crater.

 

Sources: Darwin Volcanic Ash Advisory Center (VAAC), Rabaul Volcano Observatory (RVO) , GVP.

Photo : cocomagnanville

 

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 the summit and at Puʻuʻōʻō vent on the East Rift Zone. The episode 61g lava flow from Puʻuʻōʻō is entering the ocean at Kamokuna. Surface flows are active above the pali, but pose no threat to nearby communities. The summit lava lake surface is more than 30 m (98 ft) below the floor of Halemaʻumaʻu this morning. There have been no significant changes in seismicity levels or ground deformation trends across the volcano.

https://volcanoes.usgs.gov/observatories/hvo/multimedia_uploads/multimediaFile-1706.jpg

Sunday, June 25 between 11:39 and 11:44 HST, firehose activity started at the ocean entry and continued for less than 10 minutes. A USGS time-lapse camera, which takes a photo every 5 minutes, captured this image at 11:44 and by 11:49 the firehose was replaced by a lava channel on the delta. The cause of the short-lived firehose activity was not visible from the time-lapse camera, but was likely the result of a failure of the 61g tube casing where it exits the old sea cliff.

Summit Observations:
Tiltmeters at Kīlauea’s recorded the start of deflation at about 6 pm last night and the lava lake level dropped to more than 30 m (98 ft) below the rim of the Overlook Vent but wasn’t measured this morning because of high winds in the area. Webcam views of the lava lake can be found at: http://hvo.wr.usgs.gov/cams/region_kism.php. Seismicity is within normal, background rates with tremor fluctuations associated with lava lake spattering. Summit sulfur dioxide emission rates remain high.

Puʻuʻōʻō Observations:
Webcam images over the past 24 hours show persistent glow at long-term sources within the crater and from a small lava pond on the west side of the crater. There were no significant changes in seismicity over the past 24 hours. The tiltmeter near Puʻuʻōʻō crater recorded modest inflationary tilt over the past day. 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.

 

https://volcanoes.usgs.gov/observatories/hvo/multimedia_uploads/multimediaFile-1709.jpg

A close up of spattering in the western portion of the summit lava lake.

Lava Flow Observations:
The episode 61g flow is still active and entering the ocean at Kamokuna. Near Puʻuʻōʻō, flows continue on the upper portion of the flow field. These flows do not pose any threat to nearby communities at this time.

Source : HVO

 

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