February 18 , 2018. EN. Mayon , Kilauea , Ebeko , Pacaya .

Home / blog georges Vitton / February 18 , 2018. EN. Mayon , Kilauea , Ebeko , Pacaya .

February 18 , 2018. EN. Mayon , Kilauea , Ebeko , Pacaya .

February 18 , 2018.


Mayon , Philippines :

MAYON VOLCANO BULLETIN 18 February 2018 08:00 A.M.

Mayon’s activity in the past 24 hours was characterized by sporadic and weak lava fountaining, lava flow and degassing from the summit crater. Three (3) discrete lava fountaining episodes were recorded at 1:03 AM and 4:49 PM yesterday and 1:59 AM this morning. The first of these lasted twelve hours and eighteen minutes, generating grayish ash plumes that rose 400 m above the summit crater. Discrete seismic events associated with otherwise obscured lava fountaining lasted three to 21 minutes and were recorded until 1:21 PM yesterday. The second episode lasted 43 minutes and consisted of discrete seismic events of up to 10 minutes duration that were accompanied by rumbling sounds audible beyond 10 kilometers of the summit crater. The third episode started early this morning and is characterized by discrete signals with attendant incandescent lava flow. Lava flows have advanced to 3.3 kilometers, 4.5 kilometers and 900 meters down the Miisi, Bonga and Basud Gullies, respectively, from the summit crater. Pyroclastic density currents or PDCs have deposited to the 4.6, 4.5 and 4.2 kilometer reaches of the Miisi, Bonga and Basud Gullies, respectively.

A total of fifty-five (55) volcanic earthquakes, most of which corresponded to lava fountaining events, and three (3) rockfall events were recorded by Mayon’s seismic monitoring network. Sulfur dioxide (SO2) emission averaged 1,339 tonnes/day on 17 February 2018. Electronic tilt and continuous GPS still record sustained swelling or inflation of the edifice since November and October 2017, consistent with pressurization by magmatic intrusion.

Alert Level 4 remains in effect over Mayon Volcano. The public is strongly advised to be vigilant and desist from entering the eight (8) kilometer-radius danger zone, and to be additionally vigilant against pyroclastic density currents, lahars and sediment-laden stream flows along channels draining the edifice. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft.

DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

Source : Phivolcs


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 the Puʻu ʻŌʻō vent on its East Rift Zone. The episode 61g lava flow activity persists on the upper portion of the flow field and on Pulama pali. Lava is not entering the ocean at this time. These lava flows pose no threat to nearby communities at this time. The lava lake surface is approximately 34 m (112 ft) below the floor of Halemaʻumaʻu. Low rates of ground deformation and seismicity continue across the volcano.

Summit Observations:
Summit tiltmeters recorded no change (flat) in tilt at Kīlauea. The lava lake surface is approximately 34 m (112 ft) below the rim of the Overlook Vent, based on webcam images. Seismicity is within normal, background rates with tremor fluctuations associated with lava lake spattering

Puʻu ʻŌʻō 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 has shown little significant change 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.

Lava Flow Observations:
The episode 61g flow is still active, but no lava is flowing into the ocean. Based on overnight web camera images, surface lava flow activity persists on the upper portion of the flow field and on Pulama pali. None of these flows poses any threat to nearby communities at this time.

Source : HVO

Photos : Bruce Omori


Ebeko , Kamchatka :


Issued: 20180218/0052Z
Volcano:Ebeko (CAVW #290380)
Current aviation colour code:ORANGE
Previous aviation colour code:orange
Notice Number:2018-25
Volcano Location:N 50 deg 41 min E 156 deg 0 min
Area:Northern Kuriles, Russia
Summit Elevation:3791.68 ft (1156 m)

Volcanic Activity Summary:
According to visual data by volcanologists from Severo-Kurilsk, explosions sent ash up to 2 km a.s.l.; ash plume drift to the north-east from the volcano.

A moderate gas-steam with some amount of ash activity of the volcano continues. Ash explosions up to 16,400 ft (5 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft and airport of Severo-Kurilsk.

Volcanic cloud height:
6560 ft (2000 m) AMSL Time and method of ash plume/cloud height determination: 20180218/0037Z – Visual data

Other volcanic cloud information:
Distance of ash plume/cloud of the volcano: 4 mi (6 km)
Direction of drift of ash plume/cloud of the volcano: NE / azimuth 50 deg
Time and method of ash plume/cloud determination: 20180218/0037Z – Visual data

Source : Kvert

Photo : Olga Tuma


Pacaya , Guatemala :

Type of activity: Strombolian
Morphology: Composite Stratovolcan
Location: 14 ° 22’50˝Latitude N; 90 ° 36’00˝Longitude W.
Height: 2,552msnm.
Weather conditions: Clear
Wind: North.
Precipitation: 0.0 mm.

Activity is observed with moderate fumaroles and small Strombolian explosions in the Mackenney crater. This activity continues to build a slag cone. At night, it is possible to observe incandescences, from several points on the South side. A lava flow about 225 meters long is maintained on the South-South-West flank. The PCG seismic station records the internal tremor (vibration) produced by degassing.

Source : Insivumeh


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