Vikings Volcanic Activity Thread

[kaz]

ok well thats good then phew...

Keep up the good work i hang on every word thanks again for all hard work

lol kaz xx

[BARRY]

thanks viking and please keep us informed cheers

[Guest Viking141]

Hi all, thanks for the kind comments!

A few weeks ago, someone asked me about volcanos in New Zealand. At that time there was nothing happening in that part of the world, however that has now changed.

White Island

White Island is an uninhabited island some 2.4miles long x 2miles wide, which lies in the Bay of Plenty, some 50km offshore from New Zealands North Island. It is the emergent summit of a large (16km x 18km) submarine volcano and is currently 321m high. The last known eruption from White Island was in 2001.

On 13th Feb, visiting scientists reported that the temperature in the crater lake on the island has risen continually since August last year. The normal temperature range for the lake was 48-50C but in January 2007 the temp had reached over 60C and on this visit the temp had reached 74C. On 19th Feb minor ash eruptions began at the island and a plume of grey ash rose some 2km above thisland and drifted towards the mainland. Fine ash was deposited on White Island and an acid aerosol cloud reached the mainland town of Matata. On 23 Feb Washington VAAC reports an ash cloud that reached an altitude of 10,000ft.

The above photograph is of the main crater at White Island taken today (6 March - New Zealand Time) courtesy IGNS (Institute of Geological and Nuclear Sciences). The geologist has a sense of humour obviously, note the Dino toy in the foreground!!

Edited March 5, 2007 by Viking141

[SalopWatcher]

Was me asking about NZ, cheers again Viking....

[Red Raven]

vesuvius is showing some increased seismic movement.

http://www.ov.ingv.it/seismogroup-file/seg...;t=GMT&id=6

Edited March 6, 2007 by Red Raven

[summer blizzard]

vesuvius is showing some increased seismic movement.

http://www.ov.ingv.it/seismogroup-file/seg...;t=GMT&id=6

Yes, it could be building towards a bigger seismic event such as the one at Maltese.

Is this on the left or right sensor of the volcano????

[Red Raven]

Its the one on the right (pompei side)

[Guest Viking141]

Im sure we are all aware of the news of another large earthquake today on the Indonesian island of Sumatra. Over the last 3 years, there have been 5 major earthquakes in Indonesia, 3 of them with epicentres in Sumatra. There are plenty of Volcanos in Indoensia and on Sumatra itself so it may well be an idea to keep an eye on these for any "knock-on" effect due to this fairly high level of tectonic activity. I'll see if I can find any decent links to webcams/sites etc that would be of use to us and keep you posted.

One worth watching may be Talang,which erupted only a few months ago and is located just to the ESE of the epicentre of this earthquake centred on the city of Padang.

Cheers

Viking

Edited March 6, 2007 by Viking141

[Guest Viking141]

Still a fair bit of grumbling going on in the Stromboli/Bay of Naples area with several of the seismographs showing activity. Stromboli in particular seems to have picked up again today.

[Guest Viking141]

Hi all. Apologies for not updating recently but have had the most god-awful dose of "man-flu" which Im just getting clear of now. Hope to have an update done tonight or tomorrow.

Cheers

Viking

Edited March 15, 2007 by Viking141

[BrickFielder]

Two earth quake swarms at mammoth mountain in the last few days. Nothing to worry about but may suggest some magma movement beneath the resurgent dome.

Long Valley observatory

Similarly earthquake swarms occured during February at Yellowstone.

Yellowstone Observatory

St Helens is still on alert level Orange

USG Alerts

A little Activity on Tenerife yesterday.

Tenerife

Most earth quakes seem to be around the Pacific at the moment.

Earthquakes

Plenty of activity towards the phillipines today.

Seismic Data

Could be in association with Batu tara erupting.

Volcanic Ash advisories in effect out of Darwin for Batu tara

Volcanic Ash Advisories

Activity at Iceland and of the coast of portugal a couple of weeks ago has not continued.

Earthquake map

Relatively quiet compared to this time last year , although there are signs of

[Gray-Wolf]

Thanks for the links Brickfielder, you're a brick!

That's a biggie in Poland a 6:10pm today (well 2 in the same spot) nothing blowing up there is there? (can't see it as in an active earthquake zone?)

21st of Jan 2007 until 15th March 2007

Thanks to EMSC for the screen shot. What do you make of that 'ring' around the Agean? There are more in the ring as you go back through jan with one more cetral blue dot (in the same spot as the central blue dot on this one) but you lost some of the 'impression' with the extra's.

Isn't Santorini in the middle of the ring? Does it mean anything when a slumbering volcanoe is surrounded on all sides by earthquake swarms?

Edited March 15, 2007 by Gray-Wolf

[Guest Viking141]

Crater Lake on Mt Ruapehu bursts banks

The crater lake at the summit of Mount Ruapehu in New Zealand has burst its banks sending a huge lahar cascading down the mountainside. New Zealand Civil Defence Authorities have activated their emergency response plan.

This was not a totally unexpected event. The surge of water,mud and debris was seen heading down the southern flank of the mountain, towards Tangiwai,where a similar event in 1953 swept away a rail bridge with a passenger train on it, killing 151.

Details,pictures and video can be found by following the link below:

Reuters article

[parmenides3]

Found this in Atmospheric Chemistry & Physics Discussions, and thought it was quite interesting: it's about the effect of major volcanic eruptions on weather patterns. It is also an open paper, so you can access the entire thing from the link at the bottom.

http://www.copernicus.org/EGU/acp/acpd/7/3...acpd-7-3941.htm

Just another log to throw on the volcano/climate/weather fire...

:)P

[Guest Viking141]

Found this in Atmospheric Chemistry & Physics Discussions, and thought it was quite interesting: it's about the effect of major volcanic eruptions on weather patterns. It is also an open paper, so you can access the entire thing from the link at the bottom.

http://www.copernicus.org/EGU/acp/acpd/7/3...acpd-7-3941.htm

Just another log to throw on the volcano/climate/weather fire...

:)P

You? Throw logs on the fire? I never would have thought such a thing P3 :lol:

Sorry I havent updated much recently folks. Turns out I was a bit sicker than I thought I was. Wasnt "man-flu" at all but a combination of Bronchitis and a secondary chest infection so Ive been doped up to the eyeballs with anti-biotics and stuff! Hope to have an update done shortly but cant make any promises as I off down to Southampton on Sunday for another course so, as you can appreciate, I have a lot on my plate at the mo. Failing that I will do a full update when I return on Friday.Meantime, if anything kicks off in my abscence then feel free to chip in,contributions are always welcome!

Cheers

Bob

Edited March 23, 2007 by Viking141

[Crepuscular Ray]

Blimey, that sounds v. nasty Viking. Make sure you keep taking the antibiotics (and do all the other stuff like making sure you get enough sleep and - sadly - not drinking).

Not strictly about volcanoes, but there's an interesting bit on the Beeb's site about a v. ancient bit of seafloor (like 3.8 billion years old) in Greenland that shows that plate tectonics started even when the Earth was still very, very hot.

http://news.bbc.co.uk/1/hi/sci/tech/6479289.stm

[parmenides3]

While Viking is either recovering or away visiting, whichever it is at the moment, here are some recent eruptions:

Anatahan, Marianas Islands - new eruption.

Lascar, Chile - new eruption.

Manam, Papua New Guinea - regular eruptor with new activity.

Chikurachki, Kurile Islands - the most volcanic islands on earth? New eruption, after several from other volcanoes last month.

Batu Tara, Indonesia - new eruption.

Huila, Chile - new eruption.

Sangay and Reventador, Ecuador - new activity.

I'll fill in some more details later.

:)P

Edit: first update: details from SWVRC, with thanks:

Anatahan, Marianas

As of the 22nd of March, the NOAA Operational Significant Event Imagery (OSEI) Support Team has notified SWVRC that volcano Anatahan has erupted. The USGS reported that seismicity from Anatahan increased on 24 February and remained elevated through 17 March, occasionally punctuated by higher levels of tremor and increased gas emissions. On 13 March, seismic activity increased significantly; a gas plume that was visible on MODIS satellite imagery suggested increased emissions. The next day the Volcanic Alert Level was increased from Normal to Advisory. On 20 March, low levels of tremor were recorded.

The elongate, 9-km-long island of Anatahan in the central Mariana Islands consists of large stratovolcano with a 2.3 x 5 km, E-W-trending compound summit caldera. The larger western portion of the caldera is 2.3 x 3 km wide, and its western rim forms the island's 790-m high point. Ponded lava flows overlain by pyroclastic deposits fill the floor of the western caldera, whose SW side is cut by a fresh-looking smaller crater. The 2-km-wide eastern portion of the caldera contained a steep-walled inner crater whose floor prior to the 2003 eruption was only 68 m above sea level. A submarine volcano, NE Anatahan, rises to within 460 m of the sea surface on the NE flank of the volcano, and numerous other submarine vents are found on the NE-to-SE flanks. Sparseness of vegetation on the most recent lava flows on Anatahan had indicated that they were of Holocene age, but the first historical eruption of Anatahan did not occur until May 2003, when a large explosive eruption took place forming a new crater inside the eastern caldera.

The Current Colour Code for Anatahan is currently at ORANGE.

And Lascar, Chile;

As of the 16th of March, the Gobal Volcanism Network (GVN) has notified and confirmed to SWVRC the eruption of the Lascar volcano. The GVN reported that the Buenos Aires VAAC reported that on 11 March an ash cloud from Lascar rose to 5.5-6.7 km (18,000-22,000 ft) a.s.l. and drifted E.

Lascar is the most active volcano of the northern Chilean Andes. The andesitic-to-dacitic stratovolcano contains six overlapping summit craters. Prominent lava flows descend its NW flanks. An older, higher stratovolcano 5 km to the east, Volcán Aguas Calientes, displays a well-developed summit crater and a probable Holocene lava flow near its summit (de Silva and Francis, 1991). Láscar consists of two major edifices; activity began at the eastern volcano and then shifted to the western cone. The largest eruption of Lascar took place about 26,500 years ago, and following the eruption of the Tumbres scoria flow about 9000 years ago, activity shifted back to the eastern edifice, where three overlapping craters were formed. Frequent small-to-moderate explosive eruptions have been recorded from Láscar in historical time since the mid-19th century, along with periodic larger eruptions that produced ashfall hundreds of kilometres away from the volcano. The largest historical eruption of Láscar took place in 1993, producing pyroclastic flows to 8.5 km NW of the summit and ashfall in Buenos Aires.

The Current Colour Code for Lascar is currently at ORANGE.

Edited March 26, 2007 by parmenides3

[parmenides3]

Here are the rest of the most recent new reports; sorry it's so long. Source, SWVRC:

As of the 22nd of March, the Gobal Volcanism Network (GVN) has notified and confirmed to SWVRC the eruption of the Manam volcano. The GVN reported that Manam's Main Crater emitted gray ash plumes during 11-19 March. The plumes rose to altitudes of 2.3 km (7,500 ft) a.s.l. and drifted SE. Incandescence was visible the evenings of 11, 12, 16, and 18 March. Vapor clouds and occasional diffuse ash clouds were emitted from South Crater during 11-20 March.

The 10-km-wide island of Manam, lying 13 km off the northern coast of mainland Papua New Guinea, is one of the country's most active volcanoes. Four large radial valleys extend from the unvegetated summit of the conical 1807-m-high basaltic-andesitic stratovolcano to its lower flanks. These "avalanche valleys," regularly spaced 90 degrees apart, channel lava flows and pyroclastic avalanches that have sometimes reached the coast. Five small satellitic centres are located near the island's shoreline on the northern, southern and western sides. Two summit craters are present; both are active, although most historical eruptions have originated from the southern crater, concentrating eruptive products during the past century into the SE avalanche valley. Frequent historical eruptions have been recorded at Manam since 1616. A major eruption in 1919 produced pyroclastic flows that reached the coast, and in 1957-58 pyroclastic flows descended all four radial valleys. Lava flows reached the sea in 1946-47 and 1958.

The Current Colour Code for Manam is currently at ALERT LEVEL 2.

As of the 22nd of March, the Alaska Volcano Observatory (AVO) reported that a sulfur dioxide cloud from Chikurachki was seen on satellite imagery on 16 March extending 580 km NW. The altitude of the cloud was unknown.

Chikurachki, the highest volcano on Paramushir Island in the northern Kuriles, is actually a relatively small cone constructed on a high Pleistocene volcanic edifice. Oxidized basaltic-to-andesitic scoria deposits covering the upper part of the young cone give it a distinctive red color. Frequent basaltic plinian eruptions have occurred from Chikurachki during the Holocene. Lava flows from 1816-m-high Chikurachki reached the sea and form capes on the NW coast; several young lava flows also emerge from beneath the scoria blanket on the eastern flank. The Tatarinov group of six volcanic centers is located immediately to the south of Chikurachki. In contrast to the frequently active Chikurachki, the Tatarinov volcanoes are extensively modified by erosion and have a more complex structure. Tephrochronology gives evidence of only one eruption in historical time from Tatarinov, although its southern cone contains a sulfur-encrusted crater with fumaroles that were active along the margin of a crater lake until 1959.

The Current Colour Code for Chikurachki is currently at ORANGE .

As of the 25th of March, the Global Volcanism Netowrk (GVN) reported that the new eruption of Batu Tara on the tiny island with the same name is getting more intense. As explosive activity has set on, ash clouds are ejected to up to 2-3 km above the small volcanic cone. As a safety measurement, mainly to protect them from tsunami (that might be triggered by earthquakes, landslides or pyroclastic flows) around 7,000 inhabitants of the closest neighbouring island, Lembata 50 km to the south, were evacuated. Fishermen, also, have been warned to stay at least 2 miles (3.2 kilometres) from the volcanic island.

The small isolated island of Batu Tara in the Flores Sea about 50 km north of Lomblen Island contains a scarp on the eastern side similar to the Sciara del Fuoco of Italy's Stromboli volcano. Vegetation covers the flanks of Batu Tara to within 50 m of the 748-m-high summit. Batu Tara lies north of the main volcanic arc and is noted for its potassic leucite-bearing basanitic and tephritic rocks. The only confirmed historical eruption from Batu Tara, during 1847-52, produced explosions and a lava flow. There was a pilot report of an ash eruption in 2006, although ash was not detected on satellite imagery.

The Current Colour Code for Batu Tara is currently at ALERT LEVEL 2 .

As of the 8th of March, the Instituto Colombiano de Geología y Minería (INGEOMINAS) has reported that the Washington VAAC reported that satellite imagery confirmed an eruption from Nevado del Huila on 19 February. The ash cloud rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted W. Later the same day, a pilot reported an ash cloud to the same height and direction. During 2-3 March, INGEOMINAS reported that volcanic tremor was accompanied by gas-and-ash emissions that drifted NW. Fumaroles emitted from a N-S trending fissure.

Nevado del Huila, the highest active volcano in Colombia, is an elongated N-S-trending volcanic chain mantled by a glacier icecap. The andesitic-dacitic volcano was constructed within a 10-km-wide caldera. Volcanism at Nevado del Huila has produced six volcanic cones whose ages in general migrated from south to north. Two glacier-free lava domes lie at the southern end of the Huila volcanic complex. Only a single 16th-century explosive eruption is recorded in historical time from this little known volcano. Two persistent steam columns rise from the central peak, and hot springs are also present.

The Current Colour Code for Huila is at ORANGE.

As of the 26th of March, the Instituto Geofisico (IG), after being translated from Spanish, reports that a very bright hotspot can be seen in satellite imagery through 0245Z. Ash is not identifiable through either IR or multi-spectral imagery. A hotspot is seen in GOES-12 split-window IR imagery through 0945Z. Ash is not identifiable in METSAT imagery. No hotspot has been seen at the summit since this morning on multi-spectral imagery. Weather clouds have moved into the region and are shrouding the volcano. If emissions occur, ash will move to the west 5.75-11.5 mph at 18,000 ft. SWVRC will continue to monitor.

Reventador is the most frequently active of a chain of Ecuadorian volcanoes in the Cordillera Real, well east of the principal volcanic axis. The forested, dominantly andesitic Volcán El Reventador stratovolcano rises to 3562 m above the jungles of the western Amazon basin. A 4-km-wide caldera widely breached to the east was formed by edifice collapse and is partially filled by a young, unvegetated stratovolcano that rises about 1300 m above the caldera floor to a height comparable to the caldera rim. Reventador has been the source of numerous lava flows as well as explosive eruptions that were visible from Quito in historical time. Frequent lahars in this region of heavy rainfall have constructed a debris plain on the eastern floor of the caldera. The largest historical eruption at Reventador took place in 2002, producing a 17-km-high eruption column, pyroclastic flows that traveled up to 8 km, and lava flows from summit and flank vents.

The official colour of the volcanic alarm light for Reventador is ORANGE .

As of the 23rd of March, the Instituto Geofisico (IG), after being translated from Spanish, reports that the Geophysical Institute reported ash at 1335Z. Ash cannot be seen in satellite imagery with clouds present. SWVRC will continue to monitor and update if further activity occurs.

The isolated Sangay volcano, located east of the Andean crest, is the southernmost of Ecuador's volcanoes, and its most active. The dominantly andesitic volcano has been in frequent eruption for the past several centuries. The steep-sided, 5230-m-high glacier-covered volcano grew within horseshoe-shaped calderas of two previous edifices, which were destroyed by collapse to the east, producing large debris avalanches that reached the Amazonian lowlands. The modern edifice dates back to at least 14,000 years ago. Sangay towers above the tropical jungle on the east side; on the other sides flat plains of ash from the volcano have been sculpted by heavy rains into steep-walled canyons up to 600 m deep. The earliest report of a historical eruption was in 1628. More or less continuous eruptions were reported from 1728 until 1916, and again from 1934 to the present. The more or less constant eruptive activity has caused frequent changes to the morphology of the summit crater complex.

The official colour of the volcanic alarm light for Sangay is ORANGE .

[Guest Viking141]

Hi folks.

Back from my sojourn to Highcliffe-on-Sea for a challenging chartwork course and now Im on two weeks leave -lovely jubly. Thanks to P3 for the update in my absence.

Here we go then with the latest round-up of volcano news:

Batu Tara (Indonesia)

The eruption already reported by P3 continues. Based on reports from fishermen from local communities up to 50km away, CVGHM (Centre of Volcanology and Geological Hazard Mitigation) raised the alert level from 1 to 2 (on a scale of 1-4) and reports that eruption plumes continue to rise to altitudes of some 7,200ft. Latest report from the Darwin VAAC dated 1751 UTC today reports continuous low-level ash plumes rising to an altitude of 5,000ft.

Batu Tara is an isolated island in the Lesser Sunda Islands in the Flores Sea.Its last known eruption,until the current one, was in 1847-1852 which produced explosions and a lava flow.

Fuego (Guatemala)

INSIVUMEH reports that from 21 to 27 March explosions from Fuego produced gas and ash plumes which rose to a height of some 16,700ft. Washington VAAC also reported plumes during the same period. Ashfall has been reported in areas 5-8km SSE of the volcano and 9km W and further explosions on 26 Narch produced further ashfall in areas 10-25km away to the W and SE. There has also been reports of explosions producing lava blocks which rolled down the W flank of the volcano toward the Taniluya River valley.

Reventador (Ecuador)

The eruption of this volcano continues,with continued seismic activity, gas and ash emissions and incandesence in the main crater, according to the latest report from IG-EPN.

Tungurahua (Ecuador)

Our old friend Tungurahua is also very active at the moment. IG-EPN reports that there are constant ash and gas plumes being emitted from this volcano up to altitudes of 23,000-33,000ft. Ashfall has been reported in towns and villages up to 8km SW of the volcano on all days except 25 and 27 March. Noises resembling "cannon shots" have been heard which rattled windows as far away as Guadelupe, 11km to the North. Lava blocks and lahars have been observed travelling down the volcanos slopes.

Colima (Mexico)

During the past week Colima has ejected incadescent material to heights of 50-100m above the crater. Steam and steam-and-ash plumes rose to heights of over 16,000ft. According to the Center of Exchange and Research in Volcanology at the University of Colima reports the growth of a new lava dome,which was first observed by helicopter flight on 2 February and this growth continues.

[Habsish]

Any update on the mud volcano in Java that seems to be swamping everything?

Regards

H

[summer blizzard]

No activity around Italy at the moment, has the strength of the Stromboli eruption been decided yet, VEI2 i suspect tit was.

[kippure]

Here

The latest....

[biddie]

What an amazin picture the one with the rainbow is !

[Guest Viking141]

Piton de la Fournaise

As reported by Kippure, one of the worlds most active volcanos, Piton de la Fournaise, which is on Reunion Island in the Indian Ocean, is currently spewing lava into the ocean.

Featured earlier in this thread, Piton de la Fournaise is in many respects similar to Kilaeua in Hawaii, in that it is an effusive volcano which emits high volumes of very runny lava.

OVPDLF (Observatoire Vulcanologique du Piton de la Fournaise) reports that this eruption began on 2nd April when a NW-SE trending fissure opened on the volcano sending curtains of lava 50m into the air. This fissure is located to the SW of the main Dolomieu crater and is approx 1km long.

A webcam of the volcano can be found here:

Piton webcam

And some excellent pictures here:

Piton website

Edited April 5, 2007 by Viking141

[Guest Viking141]

Alrighty, time for another round-up of whats happening in the volcano world.

Ambrym

Ambrym Island in Vanuatu, part of the New Hebrides Arc of volcanos, has sprung into life recently. According to latest reports from the Wellington VAAC, lava and ash has been emitted from this volcano since 3rd April, according to pilot observations. Ash plumes are reported to have risen to altitudes of 8,000ft.

Ambrym is a large basaltic volcano with a 12km wide caldera which has historically been one of the most active in the New Hebrides Arc. The caldera was formed during a major plinian eruption some 1900 years ago. Ambryn erupts on an almost annual basis. There are two active cones within the large caldera, Benbow and Marum, the rest of the caldera is an ash plain, absolutely barren due to acid rain caused by the volcano.

Batu Tara

This Indonesian volcano is continuing to produce semi-continuous ash plumes up to heights of 10,000ft which drifted E and N of the island, according to latest reports from the Darwin VAAC and the Indonesian CVGHM. This trend continues today with the latest report from the MODIS AQUA satellite at 1315UTC today again showing an ash plume to 10,000ft drifting W. This volcano remains at Aviation Concern Code Colour YELLOW.

Reventador & Tungurahua

Our Ecuadorean friends Reventador & Tungurahua continue to erupt, according tolatest information from IG-EPN. On 28 March, loud roaring noises were heard by observers from Reventador and an ash plume extending to 18,400ft was seen. A lava flow also traveled some 200m down the S flank. During 29-31 March ash emissions and Strombolian activity was observed and on 1st April, ash plumes rose to 24,000ft and incandescent rocks were hurled 50m above the crater. Washington VAAC also reports that satellite imagery detected a hotspot at the summit during 1-3 April.

On 27 March, an ash column from Tungurahua rose to an altitude of 36,000ft and a pyroclastic flow traveled approx 1km down the Mandur Gorge on the NW flank. A lahar also traveled down the Bilbao Gorge, causing nearby buildings to vibrate.Ash plumes again rose to 36,000ft on 28 March and this caused ashfall in villages downwind. Three large explosions on 29 March rattled windows up to 8km away and during 30 March-3 April noises like “cannon-shots” were heard along with roaring noises and ash plumes which rose to 34,400ft. Incandescant material was ejected from the crater to a height off some 300m and subsequently landed up to 1 mile down the flank during 1-2 April.

The picture below of Tungurahua was taken on 31 March - courtesy IG-EPN

Slamet

A new volcano to us here on this thread, Slamet is Indonesias second highest volvano, rising to 3428m above the island of Java. The last reported eruption from this volcano was in 1999. Historically its eruptions, like most of Indonesias volcanos, have been explosive in nature, lasting anywhere from between a few days to a few weeks.

According to local news media reports, increases in emissions from this volcano were noticed during the last few weeks with an ash plume rising to 12,500ft. A local government official, Pemalang Sukedi, said “the volcanic smokes were clearly seen from Central Java provincial capital of Semarang or from the eastern part of the highest mountain in the province. The signs of the increasing volcanic activity are also felt with the increasing temperature on the mountainous areas," Could be one to watch as an eruption may be imminent.

Karangetang

Again, according to local Indonesian news media reports, further activity was observed from Karangetang which lies on Siau Island, N of Sulawesi. Ash plumes roseto a height of 6,000ft and pyroclastic flows were observed on 28 March.

Karymsky, Kliuchevskoi & Shiveluch

Our trio of very active Kamchatkan volcanos are still very busy! According to the Tokyo VAAC an eruption plume rose from Karymsky on 31 March to a height of 10,000 although the latest report today suggest only light volcanic ash at 25,000ft.

Lava flows were observed flowing from Kliuchevskoi during 29-31 March and on 31 March, lava bombs were ejected to heights of 100-200m above the main crater. Local news media reports the lava flows interacting with the snow on the volcano to produce large vapour plumes.

An explosive event at Shiveluch on 29 March, produced an ash plume which rose to 32,000ft and drifted SE of the volcano. The next day,another explosive event, which lasted some 6 minutes, produced an even larger ash plume which rose to 40,000ft and a mudflow which covered almost a km of the road about 20km from Shiveluch on 31 March.

Ubinas

Ubinas is a relatively young volcano in Peru, which has been in a constant state of semi-eruption since before I started this thread! Latest reports from the Buenos Aires VAAC timed at 1209 UTC today reports an ash plume up to 20,000ft. Local news reports suggest ashfall and rockfall affecting local villages. This volcano is at Aviation Concern Colour RED. A scientist from Perus Geological, Mining and Metallurgic Institute (INGEMMET) states that the explosion which produced this cloud was the biggest in the last two week period, which has been characterized by an overall increase in the rate of explosive activity at the volcano. This caused panic in neighbouring towns and villages, according to media reports. Town authorities in Anascapa, some 6km away from the volcano, were said to be handing out protective mask to residents but had run out due to a limited supply.