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In this Thursday, April 23, 2015 photo, the Calbuco volcano erupts near Puerto Varas, Chile. The volcano erupted for the first time in more than 42 years, billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile. (AP Photo/David Cortes Serey/ Agencia Uno)

By Miguel Perez – AccuWeather

Following back-to-back, major eruptions of the Calbuco volcano in southern Chile, which occurred for the first time in 42 years on April 22, the volcano registered a third eruptive pulse, or an explosive eruptive plume, Thursday.

According to CIMAT – Early Warning Monitoring Information Center, Calbuco registered the third pulse of the eruption and forced preventive evacuations in the affected area.

“Unlike eruptions last week, winds above the volcano directed ash from Thursday’s eruption to the east-southeast of the volcano and not toward Buenos Aires and Santiago,” AccuWeather.com Senior Meteorologist Kristina Pydynowski said.

Through a new report issued Thursday, the National Emergency Office (Onemi) gave details on the number of evacuees and the effects the new eruptive pulse produced.

Solid activity increased at 1:09 p.m. Thursday, Chilean time, according to the National Service of Geology and Mining (Sernageomin).

Continue reading at AccuWeather: ‘Eruptive Pulse’ of Chile’s Calbuco Volcano Forces Evacuations

Ash column erupted from Calbuco

Calbuco (Southern Chile and Argentina): A strong explosive eruption occurred today (12:10 on 30 April, local time) at the volcano, producing an ash column that rose several kilometers above the summit crater.
VAAC Buenos Aires estimated the height of the plume at 16,000 ft (5 km) altitude. The explosion came after a gradual decrease in activity with weak ash emissions during the past days.
The alert level remains at red (highest).

Continue reading at Volcano Discovery: Volcanoes Today, 1 May 2015: Calbuco Volcano

 

Pyroclastic flow at Sinabung yesterday at 18:20 (image: @endrolewa / twitter)

Sinabung (Sumatra, Indonesia): A series of strong pyroclastic flows occurred yesterday 28 April 2015, reaching 3-4.5 km distance. The largest, at 18:20 local time touched and burnt the (evacuated) village of Guru Kinayan on the southern slope of the volcano.
The flows, at least 9 in total, were results of the partial collapse of the recently emplaced lava lobe on the steep upper flank. They occurred at 17:02, 17:20, 17:33, 17:44, 17:47, 17:50, 18:03, 18:20 (probably the largest one), and at 19:52 local time.

Dempo (Sumatra): PVMBG raised the alert level of the volcano to 2 (waspada, “watch” on a scale of 1-4) because of increased seismic activity (mainly tremor and volcanic-tectonic earthquakes).
It is recommended not to approach the crater within 1 km.
 
The volcano’s crater contains a large acid lake and a very active hydrothermal system. Phreatic or phreatomagmatic explosions could occur any time and would pose a significant risk.

Piton de la Fournaise (La Réunion): A new eruption could be on its way at the volcano.
A sharp increase in volcanic CO2 emissions, significant deformation of the Dolomieu crater, and a migration of earthquakes from deep to shallow (7 km) levels, as well as earthquakes near the surface itself that have appeared over the past weekend suggest new magma is on its rise to a possible new eruption, which would be the second in 2015.
 
The prefecture raised the alert to level 1 (“eruption likely”) and closed access to the Enclos Fouqué this morning.
The volcano observatory considered two scenarios most likely:
Continue reading at Volcano Discovery: Volcanoes Today, 30 Apr 2015: Dempo volcano, Piton de la Fournaise, Sinabung

Pyroclastic flow on Sinabung yesterday (photo: Firdaus Surbakti – facebook.com/firdaus.surbakti)

Chirpoi (Kurile Islands, Russia): SVERT reported that on 13 April satellite images over Snow, a volcano of Chirpoi, detected steam-and-gas emissions. Cloud cover obscured views on the other days during 9-15 April. The Aviation Color Code remained at Yellow. (Smithsonian / USGS Weekly Volcanic Activity Report 9-15 April 2014)

Chirinkotan (Northern Kuriles): SVERT reported that satellite images of Chirinkotan showed gas-and-steam emissions on 9 April drifting more than 50 km SE. Cloud cover obscured views during 10-15 April. The Aviation Color Code remained at Yellow. (Smithsonian / USGS Weekly Volcanic Activity Report 9-15 April 2014)

Nishino-shima (Volcano Islands): A possible explosive eruption occurred this morning; VAAC detected an ash plume at estimated 7,000 ft (2.1 km) altitude drifting east from the volcano. This could have been caused by a stronger phreato-magmatic explosion (sea water coming in contact with magma).

Sakurajima (Kyushu, Japan): The volcano has been unusually calm recently. No significant explosion was recorded since 12 April.

Sinabung (Sumatra, Indonesia): A pyroclastic flow occurred yesterday afternoon (17:40 WIB) at the volcano. Most likely, it was triggered by a partial collapse of the steep lava tongue that had been emplaced on its southern flank during the past months.
Fortunately, the flow was rather small and only reached the now depopulated area at the feet of the mountain.

Dukono (Halmahera): Ash plumes from stronger explosions have become a more or less daily appearance in VAAC Darwin’s reports of volcanic ash clouds. The volcano clearly is in an elevated state of activity at the moment.

Shishaldin (United States, Aleutian Islands): Alaska’s Volcano Observatory (AVO / USGS) maintains alert status orange: “Minor steaming was observed in web camera images during clear periods over the past day. Satellite images show no evidence of eruptive activity. No significant changes observed in seismic data.”

Popocatépetl (Central Mexico): No significant changes have occurred in the volcano’s currently low activity. Small to moderate emissions of steam and minor amounts of ash were observed at rates of approx 1 per hour (CENAPRED counted 22 events during 16-17 April).

Reventador (Ecuador): The volcano continues to produce small to medium explosions with ash plumes rising up to 1.5 km. A MODIS hot spot indicates the presence of fresh lava at the summit, but there seems to be currently no lava flow.

Tungurahua (Ecuador): Activity at the volcano remains high with intermittent small to moderate explosions and ash emissions. Plumes of steam and various amounts of ash have been rising up to 3 km above the summit and drifting into westerly directions. Light ash fall occurred in Bilbao, Cusua, Choglontus, and Manzano.
Incandescence was observed at night, suggesting ongoing strombolian activity.

Ubinas (Peru): The latest report by Peru’s Institute of Geophysics (IGP) issued a series of recommendations to authorities, among which to raise the alert level to orange, given that activity has gradually increased and is now comparable to the eruption during 2006.
IGP also recommends to fully evacuate the villages of Querapi and Tonohaya; according to local press Querapi (the closest to the volcano) seems already to have been more or less evacuated.
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The effects of ash fall should be evaluated, since it is becoming a serious problem in some of the most affected areas, where it has reached a combined a thickness of several millimeters.
– Evacuation routes should be established.

Currently erupting:

Ambrym (Vanuatu): active lava lakes in several craters (updated 14 Aug 2013)
Barren Island (Indian Ocean): intermittent activity, likely strombolian-type and/or lava flows (updated 4 Feb 2014)
Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 27 Mar 2014)
Colima (Western Mexico): extrusion of lava flow from summit, intermittent explosions (updated 10 Apr 2014)
Dukono (Halmahera): thermal anomaly, probably small explosive activity in summit crater (updated 13 Apr 2014)
Erebus (Antarctica): active lava lake in summit crater (updated 21 Jan 2012)
Erta Ale (Ethiopia): active lava lake in northern pit crater, active hornito with intermittend flow in southern crater (updated 11 Jan 2013)
Etna (Sicily, Italy): lava flow from base of New SE crater, strombolian explosions / ash emissions from NSEC (updated 4 Feb 2014)
Fuego (Guatemala): frequent moderate to large strombolian explosions (updated 14 Apr 2014)
Gamalama (Halmahera): ash eruptions since 17 Sep (updated 17 Sep 2012)
Grozny (Iturup Island): fumarolic activity (updated 3 Apr 2013)
Heard (Australia, Southern Indian Ocean): likely lava lake in summit crater (updated 1 Aug 2013)
Ibu (Halmahera, Indonesia): growing lava dome, occasional ash emissions (updated 30 Mar 2014)
Karkar (Northeast of New Guinea): possible ash eruption on 1 February (updated 27 Mar 2014)
Karymsky (Kamchatka): occasional small explosions, thermal anomaly (updated 13 Apr 2014)
Kavachi (Solomon Islands): no eruption since 2007 (updated 2 Feb 2014)
Kilauea (Hawai’i): lava lakes in Halemau’uma’u and Pu’u ‘O’o, lava flows on coastal flat and weakly active ocean entries (updated 13 Aug 2013)
Kizimen (Kamchatka): degassing (updated 22 Aug 2013)
Lokon-Empung (North Sulawesi, Indonesia): small explosions, lava flow? (updated 25 Jul 2013)
Manam (Papua New Guinea): degassing, occasional ash venting (updated 28 Aug 2013)
Marapi (Western Sumatra, Indonesia): sporadic explosions (updated 27 Mar 2014)
Merapi (Central Java, Indonesia): sporadic phreatic explosions (updated 27 Mar 2014)
Nishino-shima (Volcano Islands): lava effusion enlarging the new island (updated 7 Apr 2014)
Nyiragongo (DRCongo): active lava lake in summit crater (updated 26 Feb 2014)
Ol Doinyo Lengai (Tanzania): effusion of natrocarbonatite lava inside the crater (updated 8 Jul 2013)
Reventador (Ecuador): extrusion of lava flows from summit, small pyroclastic flows, ash venting and intermittent explosions (updated 14 Apr 2014)
Sakurajima (Kyushu, Japan): ash venting, intermittent explosions (updated 24 Mar 2014)
Santa María / Santiaguito (Guatemala): Santiaguito volcano (Guatemala): lava flow on south flank of dome becomes more active (updated 10 Apr 2014)
Semeru (East Java, Indonesia): growing lava dome, ash venting and small to moderate explosions (updated 25 Jul 2012)
Shiveluch (Kamchatka): growing lava dome, incandescent avalanches, occasional explosions (updated 6 Apr 2014)
Sinabung (Sumatra, Indonesia): effusion of viscous lava, steaming, ash emissions (updated 10 Apr 2014)
Slamet (Central Java): mild strombolian activity from summit crater (updated 26 Mar 2014)
Stromboli (Eolian Islands, Italy): continuing lava overflows (updated 25 Jul 2013)
Suwanose-jima (Ryukyu Islands): strombolian to weak vulcanian explosions (updated 24 Feb 2014)
Tinakula (Santa Cruz Islands, Solomon Islands): increased activity at the volcano (updated 8 Feb 2013)
Tungurahua (Ecuador): strombolian activity, effusion of lava flow on upper NW flank (updated 14 Apr 2014)
Ubinas (Peru): near-constant ash emissions, intermittent explosions (updated 14 Apr 2014)
Yasur (Tanna Island, Vanuatu): ash emissions, weak strombolian explosions (updated 14 Aug 2013)

More at Volcano Discovery: Volcanoes Today, 18 Apr 2014: Ubinas, Sinabung, Nishino-shima, Popocatépetl, Dukono, Reventador, Tungurahua, Sakurajima

Sinabung (Sumatra, Indonesia): The eruption shows little variations as the volcano continues to effuse viscous magma at the summit vent. A part of that simply contributes to the growth of the lava dome and the viscous lava tongue that descends on the SE flank. Another part of the new magma collapses and produces rock-falls that turn into pyroclastic flows such as this morning (video):

Now that the gulley on the SE side of the volcano has mostly been filled by the lava flow, pyroclastic flows are no longer well channeled and might take other paths more to the south or east. This makes the situation for some areas more dangerous than before.

Dukono (Halmahera): More ash emissions occurred this morning. Satellite images show an ash plume extending 40 nautical miles (approx 70 km) to the east, at altitudes of around 7,000 ft (2 km).

Shishaldin (United States, Aleutian Islands): The Alaska Volcano Observatory raised the Aviation Color Code of the volcano to YELLOW and the Alert Level to ADVISORY yesterday morning. Increased steaming was seen and satellite data showed a new thermal anomaly in the summit crater indicating a new hot surface, possibly from a new lava dome. The last activity at the volcano dates back to 2004.

Currently erupting:

Ambrym (Vanuatu): active lava lakes in several craters (updated 14 Aug 2013)

Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 16 Aug 2013)

Cleveland (Aleutian Islands, Alaska): sporadic small (phreatic?) explosions (updated 6 May 2013)

Colima (Western Mexico): explosions and lava flows (updated 19 Jul 2013)

Dukono (Halmahera): thermal anomaly, probably small explosive activity in summit crater (updated 31 Jan 2014)

Erebus (Antarctica): active lava lake in summit crater (updated 21 Jan 2012)

Erta Ale (Ethiopia): active lava lake in northern pit crater, active hornito with intermittend flow in southern crater (updated 11 Jan 2013)

Fuego (Guatemala): strombolian explosions (updated 28 Aug 2013)

Gamalama (Halmahera): ash eruptions since 17 Sep (updated 17 Sep 2012)

Grozny (Iturup Island): fumarolic activity (updated 3 Apr 2013)

Heard (Australia, Southern Indian Ocean): likely lava lake in summit crater (updated 1 Aug 2013)

Karkar (Northeast of New Guinea): possible ash eruption on 1 February (updated 15 Mar 2013)

Karymsky (Kamchatka): occasional small explosions, thermal anomaly (updated 22 Aug 2013)

Kilauea (Hawai’i): lava lakes in Halemau’uma’u and Pu’u ‘O’o, lava flows on coastal flat and weakly active ocean entries (updated 13 Aug 2013)

Kizimen (Kamchatka): degassing (updated 22 Aug 2013)

Kliuchevskoi (Kamchatka): ash emissions, strong steaming (updated 28 Aug 2013)

Lokon-Empung (North Sulawesi, Indonesia): small explosions, lava flow? (updated 25 Jul 2013)

Manam (Papua New Guinea): degassing, occasional ash venting (updated 28 Aug 2013)

Marapi (Western Sumatra, Indonesia): occasional ash explosions (updated 14 Aug 2013)

Nyiragongo (DRCongo): active lava lake in summit crater (updated 12 Jun 2013)

Ol Doinyo Lengai (Tanzania): effusion of natrocarbonatite lava inside the crater (updated 8 Jul 2013)

Pacaya (Guatemala): deep-seated explosive activity, lava effusion ending (updated 28 Aug 2013)

Paluweh (off Flores Island, Indonesia): active growing lava dome (updated 12 Aug 2013)

Reventador (Ecuador): ash explosions, occasional pyroclastic flows (updated 30 Jan 2014)

Sakurajima (Kyushu, Japan): ash venting, intermittent explosions (updated 28 Jan 2014)

Santa María / Santiaguito (Guatemala): Santiaguito volcano (Guatemala): lava flow on south flank of dome becomes more active (updated 28 Aug 2013)

Semeru (East Java, Indonesia): growing lava dome, ash venting and small to moderate explosions (updated 25 Jul 2012)

Shiveluch (Kamchatka): growing lava dome, incandescent avalanches, occasional explosions (updated 22 Aug 2013)

Sinabung (Sumatra, Indonesia): growing lava dome, pyroclastic flows, occasional explosions (updated 31 Jan 2014)

Stromboli (Eolian Islands, Italy): continuing lava overflows (updated 25 Jul 2013)

Suwanose-jima (Ryukyu Islands): strombolian to weak vulcanian explosions (updated 28 Aug 2013)

Tinakula (Santa Cruz Islands, Solomon Islands): increased activity at the volcano (updated 8 Feb 2013)

Tungurahua (Ecuador): new eruption since 30 Jan 2014 (updated 30 Jan 2014)

Veniaminof (Alaska Peninsula, USA): effusion of lava flows (updated 16 Aug 2013)

Yasur (Tanna Island, Vanuatu): ash emissions, weak strombolian explosions (updated 14 Aug 2013)

More at Volcano Discovery: Volcanic activity worldwide 1 Feb 2014: Shishaldin, Dukono, Sinabung

Etna (Sicily, Italy): No significant changes have occurred. While the continuing unusually warm weather has stripped much of the snow on Etna’s southern side, diffuse weak ash emissions are visible from the NE crater and tremor fluctuates at low levels.

Shiveluch (Kamchatka): An explosion or a pyroclastic flow from a partial lava dome collapse produced an ash plume rising to 28,000 ft (8.5 km) this morning. Views on the webcam show a plume but don’t allow to see details what occurred at the lava dome.

Sinabung (Sumatra, Indonesia): Activity at the volcano remains unchanged. Eruptions with frequent small to medium-sized pyroclastic flows (up to 4-5 km length) continue and more than 25,000 people are reported evacuated. Problems caused by the extensive damage to crops and structures, health and infrastructure problems caused by the ongoing crisis with ash everywhere are increasing.
Recommended: Check out some great photos of the glowing lava dome, incandescent avalanches and a superb shot by Sutanta Aditya of a pyroclastic flow and related mushroom-shaped co-ignimbrite ash plume (lighter ash rising from the main body of the pyroclastic flow immediately after its emplacement) taken on 7 Jan.

Pacaya (Guatemala): According to INSIVUMEH, the eruption has considerably slowed down since last evening around 19:15 (local time), although weather prevented detailed observations. Activity at the summit decreased to moderate strombolian explosions with ejections reaching 100 m height and degassing.
The tremor signal is still saturated, suggesting that the effusion of lava continues. A strong thermal anomaly, corresponding to the new lava flows, is now visible on satellite data.
…11 Jan:
The ongoing eruption of the volcano involved the opening of at least two effusive fissure vents on the northern and southern base of the Mackenney cone (this info according to images and maps published by CONRED, although CONRED / INSIVUMEH at the same time report 3 vents on the east, west and south flank).
These fissures feed two large (and possibly one smaller third) lava flows that have reached lengths of 3-5 km length and are several hundred meters wide at their fronts (up to 800 m on the western side). The lava flows have burned extensive areas of farmland and woods and are close to some villages.
In the meantime, moderate to violent strombolian activity continues at the summit.
CONRED declared orange civil alert and started to evacuate families living in areas close to the volcano.

More at Volcano Discovery: Volcanoes Today, 12 Jan 2014: Pacaya, Shiveluch, Sinabung, Etna