Volcano news - Archive Nr. 9

For the latest part of this report - Click here

Kamchatka, Russia (Philippa)
A fantastic retro photo of volcanologists at an eruption somewhere in Kamchatka in 1975. If anyone knows which volcano this was at, please let us know.

via Ivan Sirotenko

Kamchatka Ivan Sirotenko

Sakurajima volcano, Japan (Philippa)
Not from a recent eruption, but fantastic footage from a 2013 eruption at Sakurajima volcano in Southern Japan showing a shockwave, i.e. the volcano exhaled faster than the speed of sound. The Showa crater is currently still active.

via Massimo (@Rainmaker1973)

Following on from the footage above, below is a retro photo of an eruption at Sakurajima in 1914. The city of Kagoshima is in the foreground.

via Henry Soderlund (@henrysoderlund)

Sakurajima 1914


Bromo, Indonesia (Philippa)
Holiday footage from Bromo volcano in Indonesia.

via Nomi Nee (@nomi_nee)

July 7, 2017

Kilauea volcano, Hawaii (Philippa)
The retro shot below was posted by Fumihiko Ikegami (@fikgm) as part of a meme, but I recognise the guy on the right (the Hawaiian Volcano Observatory / US Geological Survey scientist who currently overseas the monitoring for Mauna Loa volcano) and that this was therefore an a'a lava flow somewhere on the flanks of Kilauea volcano on Big Island, Hawaii. We shall endeavour to find out the story behind the image, but it is a great example of how thick these types of flows can be. The fire on the left of shot has been caused by the lava flowing over vegetation.

via US Geological Survey


Following on from the post above, more lava from Kilauea volcano, Hawaii, but this time a pahoehoe flow. It has the same chemical composition as the a'a flow in the image above, i.e. they are both basaltic lava, but a different texture. Pahoehoe flows are slower than a'a flows.

Staying on the Kilauea volcano theme, as part of their Volcano Watch blog for this 4th July (American Independence day) week, the Hawaiian Volcano Observatory published this retrospective of eruption activity to rival fireworks displays. This particular shot (see image below) was from the March 2011 Kamoamoa fissure eruption on the lower flanks of Kilauea, which caused lava fountaining and extensive lava flows. Volcanologist at bottom of shot for scale.

Kilauea rivals Fourth of July fireworks

via Ken Rubin (@kenhrubin) and Hawaiian Volcano Observatory / US Geological Survey



Krafla volcano, Iceland (Philippa)
Great fieldwork image to start the day: investigating rhyolitic** eruptions on Krafla volcano in Iceland as part of a geothermal project.
** Rhyolite is a type of lava which is more viscous (sticky) than basaltic lava due to containing a higher amount of silica.

via Hugh Tuffen (@HTuffen)


Following on from the modern day image of Krafla (above) a research team at Cambridge University have meanwhile precisely dated one of the oldest eruptions at this volcano using a combination of techniques, including investigating tree rings and ice cores. Any evidence of trees in lava flows or other volcanic deposits are useful as the rings indicate changes in growth due to climate change, whilst the wood itself can be carbon dated. Ice cores, meanwhile, preserve layers of volcanic ash in sequence as well as other useful deposits such as pollen, which tell us about the environmental conditions at the time they were deposited on the ground.

The full story can be found here:
Tree rings pinpoint eruption of Icelandic volcano to half a century before human settlement

via Clive Oppenheimer (@ultraplinian)


July 6, 2017

Science, Volcano hazard
Via Scientific American

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In spite all the harm and havoc volcanic eruptions can wreak—even the nonfatal ones—scientists still cannot reliably forecast them. Although they have had success predicting dozens of eruptions, they lack a standard method. “The field of volcanology is quite a long way behind fields like meteorology, in terms of developing forecasts,” says David Pyle, a volcanologist at the University of Oxford. Volcanoes have complicated, unpredictable behavior—and, of course, much of their activity takes place underground, which makes them significantly harder to study and develop models for than, say, weather systems. “The real challenge at the moment is that for volcanoes where we have no observations of prior eruptions and where it’s not currently densely observed, it can be very difficult to anticipate what will happen next,” Pyle says. He adds that the methods scientists use for eruption forecasts today “are pretty qualitative.” But a team of researchers at the University of Savoy Mont Blanc is attempting to develop a more reliable, accurate and data-driven approach to anticipate eruptions like the one at Eyjafjallajökull—and potentially create a daily or even hourly volcano forecast—using satellites and a method called data assimilation.
Read the full article here


Popocatepetl volcano, Mexico
Explosion at 15:40 local time on the 4th of July.

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Volcanoes of Kamchatka
A series of beautiful photo's from photographer Roberto Lopez @Bromotengger

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Bogoslov volcano, Aleutian islands, Alaska, USA
Eruption report
Following the explosive eruption that occurred today at 19:07 AKDT (03:07 UTC July 5) and lasted about 11 minutes, seismicity as detected on neighboring islands has been quiet. Satellite images show a small cloud was produced that drifted to the southeast at an altitude of 32,000 ft asl.. No additional emission from the volcano has occurred.
Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Additional explosions producing high-altitude volcanic clouds could occur at any time. Low-level explosive activity that is below our ability to detect in our data sources may be occurring. These low-level explosions could pose a hazard in the immediate vicinity of the volcano.
The Aviation Color Code remains at RED and the Alert Level remains at WARNING.

July 5, 2017

Cleveland volcano, Alaska, USA
A moderate, 10-minute-long eruption occurred at Cleveland Volcano beginning at 03:19 AKDT (11:19 UTC) on 4 July. The explosion was detected by seismic and infra-sound (air pressure) sensors. No satellite data is currently available. We are elevating the Aviation Color Code/Alert Level to ORANGE/WATCH.
Cleveland volcano is not monitored with a full real-time seismic network and this inhibits AVO's ability to detect unrest that may lead to future activity. We are able to detect explosive activity using infra-sound and limited seismic instruments on the island.

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July 4, 2017

A golden age for Earth Observation
.… and here’s a way of how you can make use of it.
We are in the edge of an exciting new era for Earth observation (a.k.a. monitoring Earth from space), and anyone can be part of it. Last April, I had the pleasure of holding a series of demonstrations on exploiting large scale satellite data from Copernicus, the largest single Earth observation programme in the world — and the most ambitious to date. These demonstrations, made on behalf of European Space Agency (ESA) and Earth Engine, took place during the European Geosciences Union (EGU) General Assembly 2017 in Vienna, Austria.
Read the full article here

Bogoslov volcano, Aleutian Islands, Alaska, USA
Eruption update :
No further ash emissions have occurred at Bogoslof Volcano since the explosion today, July 2, at 12:48 AKDT (20:48 UTC), and seismicity remains low. The eruption lasted about 16 minutes, was detected in seismic and infrasound data, and produced a cloud up to 36,000 ft asl that was carried easterly over northern Unalaska. Observers in Dutch Harbor report no noticeable ash fall from today's eruption. The National Weather Service issued a SIGMET that remains in effect.
The Aviation Color Code remains at RED and the Alert Level remains at WARNING. Additional ash-producing eruptions could occur at any time with no detectable precursors.

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Science - An Eruption In 1902 Revealed How Volcanic Firestorms Kill
Article in Forbes by David Bressan, a Must Read article
May 8, 1902 began as a sunny day in Martinique, an island in the Caribbean, with only a column of steam rising above its Mount Pelée. Until 7:50 a.m., when the mountain, an active volcano, exploded. The first rescuers arrived on the site twelve days after the explosion, accompanied by British, French and American geologists. In the city of St. Pierre, almost all of the buildings had been destroyed and estimated 20.000-40.000 people killed. But how? The main cause of destruction during a volcanic eruption, lava flows, were not in or near the city. Havivra Da Ifrile, a girl who survived by hiding inside a cave near the shore, reported this strange geological phenomenon:
“...I looked back and the whole side of the mountain, facing towards the town, seemed to open and topple down on the screaming people. I was burned … by the stones and ashes that came flying ..., but I got to the cave,…“ Read the full article here

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Gran Canaria, Canary Islands, Spain
Beautiful layering of volcanic ash on Gran Canaria, it consists of fragments of erupted material
Via Malte Froemchen @Malte_Geology

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July 3, 2017

Dieng plateau, Java, Indonesia
Update : A government aid helicopter with Search and Rescue personnel on board crashed a couple of minutes before arriving at Dieng Plateau. All 8 people on board have been killed. What a dramatic event!.

10 people injured after a hydrothermal explosion.
National Disaster Mitigation Agency spokesman Sutopo Purwo Nugroho says the eruption of Sileri Crater at Dieng Plateau spewed cold lava, mud and ash as high as 50 meters. He says the sudden eruption occurred at around 11.30am on Sunday, when there were about 17 visitors around the crater. Ten people were injured and were being treated at hospital. The Dieng Plateau in the Central Java province district of Banjarnegara is a popular tourist attraction because of its cool climate and ninth-century Hindu temples, located at an altitude of about 2,000 m above sea level.
Via @CultureVolcan

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Photo from January 2017

Volcan Popocatepetl, Mexico (Philippa)
Image from an earlier eruption today at Volcan Popocatepetl, Mexico.

Via www.webcamsdemexico.com / Volcano Popocatepetl (@Popocatepetl_MX)


Kilauea volcano, Hawaii, USA (Philippa)
Active lava spatter is currently visible on the Hawaiian Volcano Observatory's webcam at the summit area of Kilauea volcano.

via Hawaiian Volcano Observatory / US Geological Survey


July 2, 2017

Weekly Kilauea volcano overflight, Hawaii, USA
New skylights, a gorgeous pahoehoe flow above the pali, and an ocean entry lava delta getting huge! Paradise pilot Rob Mitchell got us up close and personal with Pele. The 61G surface flows remain active both on the surface and throughout the tube system. Pele's molten lava continues to pour into the ocean at Kamokuna... her flows rapidly rebuilding the bench... well over three acres big now, huge cracks near the sea cliffs belie its longevity.
Via Mick Kalber (videographer)

July 1, 2017

Sinabung volcano, Sumatra, Indonesia
Endro Lewa (https://t.co/2W4xfobBBb) continues to make the most beautiful pictures from the many explosions at Sinabung and we are happy to share them with you.

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June 30, 2017

Volcano activity for the week of June 20 until June 26, 2017

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Bogoslof | Fox Islands (USA)
AVO reported that slightly elevated surface temperatures at Bogoslof were identified in satellite images on 23 June, and steam emissions were occasionally observed the previous week. Beginning at 1649 on 23 June a significant explosive event was detected in seismic and infrasound data that lasted about 10 minutes. It produced an ash plume that rose as high as 11 km (36,000 ft) a.s.l. and drifted 400-490 km E. The event prompted AVO to raise the Aviation Color Code (ACC) to Red and the Volcano Alert Level (VAL) to Warning. Four additional explosions were detected, during 1918-1924, 2013-2021, 2104-2112, and 2152-2155, though any resulting ash plumes were not detected above the cloud deck at 8.5-9.1 km (28,000-30,000 ft) a.s.l. On 25 June the ACC was lowered to Orange and the VAL was lowered to Watch. At 1645 on 26 June an eruption which lasted about 14 minutes produced an ash plume that rose 7.6 km (25,000 ft) a.s.l. Seismic and lighting data indicated that a significant explosion began at 0317 on 27 June, prompting AVO to raise the ACC to Red and the VAL to Warning. The event lasted 14 minutes, and produced an ash plume that rose 9.1 km (30,000 ft) a.s.l. and drifted NW. The ACC was lowered to Orange and the VAL was lowered to Watch later that day.

Karymsky | Eastern Kamchatka (Russia)
KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 16-17 June. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Pavlof | United States
AVO reported that no unusual activity was detected in seismic or infrasound data at Pavlof during 21-26 June. Weakly elevated surface temperatures were identified in satellite images during 21-22 June, and a few clear webcam views revealed minor steaming. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Reventador | Ecuador
IG reported that during the previous months activity at Reventador was characterized by an average of 50 explosions per day and long-period earthquakes indicating fluid movement. Ash plumes from explosions rose as high as 2 km above the crater rim, and small pyroclastic flows descended the flanks in almost all directions. However, at 1701 on 22 June the pattern of activity changed. Seismic signals indicating emissions became continuous, and spasmodic tremor emerged which was composed of numerous small explosions. Concurrent to the change in seismicity, small-to-moderate pyroclastic flows descended 4 km down the NE flank, and plumes with low-to-moderate ash content rose 2.5 km and drifted W. Pyroclastic-flow deposits were also noted in the upper basin of El Reventador river, E of the cone. During 22-23 June incandescent blocks rolled 500 m down the flanks, steam-and-ash plumes rose 2 km, and several pyroclastic flows traveled 900 m NE. Cloud cover sometimes prevented visual observations during 24-27 June though sometimes gas-and-ash plumes were seen rising no higher than 500 m above the crater rim. Incandescent blocks continued to descend the flanks, traveling as far as 650 m. “Cannon shot” sounds were heard at night during 24-25 June. During 26-27 June several episodes of incandescence at the crater were noted, and a lava flow traveled 2 km down the NE flank.

Rincon de la Vieja, Costa Rica
OVSICORI-UNA reported that at 1456 on 23 June a phreatic eruption at Rincón de la Vieja ejected sediment onto the upper N flank and generated a plume that rose 1-2 km above the summit. The plume dispersed sediments to the W and NW, near the Von Seebach crater (about 3 km SW of the active crater).

Sheveluch | Central Kamchatka (Russia)
KVERT reported that a thermal anomaly was identified daily in satellite images over Sheveluch during 16-23 June. Explosions on 17 June generated ash plumes that rose as high as 7 km (23,000 ft) a.s.l. and drifted 300 km E. Strong explosions the next day produced ash plumes that rose as high as 10 km (32,800 ft) a.s.l. and drifted 1,500 km ESE. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Ulawun | New Britain (Papua New Guinea)
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.

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Modis satellite view of the eruption cloud of the Ulawun volcano on June 25.

Information provided by the Smithsonian Institute

June 29, 2017

Poas, Costa Rica (Philippa)
Image (below) from today's eruptive activity at Poas volcano. The column of water vapour, volcanic gases and aerosols rose to around 1 km.

via Red. Sismologica Nac. (@RSNcostarica)


Mt. Sinabung, Indonesia (Philippa)
Image (below) from one of Sinabung volcano's eruptions yesterday morning.

via Endro Lewa


Yasur, Vanuatu (Philippa)

Laki fissure, Iceland (Philippa)
Several volcanologists from British universities are currently taking air quality measurements over Katla volcano in Iceland, but managed to capture the shot (below) this morning over the craters of the Laki fissure. The craters were formed by short-lived explosive eruptions and lava fountaining on this part of the Grimsvotn volcanic system between 1783-1784. The Laki eruptions were so devastating in terms of the volcanic gases emitted that 60% of all livestock on Iceland died from fluorosis**, which in turn caused illness, famine, and the death of 20% of the Icelandic population. ** a condition which affects the teeth, in this case due to the livestock eating contaminated, volcanic ash-covered grass.

via Evgenia Ilyinskaya (@Ellyinskaya)


Bogoslov volcano, Aleutian Islands, Alaska, USA
Eruption report

No further ash emissions have occurred at Bogoslof Volcano since the explosion on June 27 at 03:17 AKDT (11:17 UTC) and seismicity remains low. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. Additional ash-producing eruptions could occur at any time, however, with no detectable precursors.

June 28, 2017

Bogoslov volcano, Aleutian Islands, Alaska, USA
Eruption report

Explosive eruptive activity resumed at Bogoslof volcano early this morning with a roughly 14 minute long episode beginning at 11:17 UTC, June 27 (03:17 AKDT). The eruption produced a volcanic cloud that reached an altitude of 30,000 ft asl based on satellite data, prompting AVO to raise the Aviation Color Code to RED and Volcano Alert Level to WARNING. No infrasound was detected at networks from nearby islands, but the World Wide Lightning Location Network (WWLLN) detected lightning strokes associated with the resulting volcanic cloud. The volcanic cloud remains visible in satellite data moving northeast and is not expected to impact local communities or mainland Alaska.

Seismicity has since declined to background levels, but Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. This morning’s explosion occurred less than 12 hours after a similar explosion yesterday afternoon, and recent eruptive episodes have produced multiple short-duration explosions with pauses of minutes to hours. Additional explosions producing high-altitude volcanic clouds could occur at any time. The Aviation Color Code remains RED and Volcano Alert Level WARNING. AVO will continue to monitor seismic and infrasound data from nearby islands, as well as lightning data from the World Wide Lightning Location Network for signs of renewed activity.

June 27, 2017

Kiluaea volcano, Hawaii weekly overflight
Via Mick Kalber (videographer)
Mick makes a weekly flight with Paradise helicopters and reports what he sees during the flight
"A lava lake in rare form, gorgeous pahoehoe flows above the Pali, and lots of visible lava on the over three acre ocean entry lava delta! Paradise pilot Sean Regehr guided us effortlessly over the flow field, as always. The 61G surface flows are remarkably active both on the surface and throughout the tube system. Pele's molten lava continues to pour into the ocean at Kamokuna... the USGS now says the lava delta is over three acres in size, extending 100 meters from the sea cliff."

Lō‘ihi seamount (submarine volcano), Hawaii, USA

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HVO seismic analysts have noted an uptick in the numbers of earthquakes near Lō‘ihi.
In June 2017 alone there were no less than 41 earthquakes earthquakes (see map below).

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Lō‘ihi Seamount is an active volcano built on the seafloor south of Kīlauea about 30 km (19 mi) from shore. The seamount rises to 975 m (3,189 ft) below sea level and generates frequent earthquake swarms, the most intense of which occurred between July 16-August 9, 1996 (more than 4,000 events). An eruption at Lō‘ihi has yet to be observed, but research indicates that eruptions are both explosive and effusive. Lō‘ihi's volume is 1,700 km3 (407 mi3), and it is considered to be between pre-shield and shield stage.
The summit of Lō‘ihi is marked by a caldera-like depression 2.8 km (1.7 mi) wide and 3.7 km (2.3 mi) long. Three collapse pits or craters occupy the southern part of the caldera; the most recent pit formed during the 1996 earthquake swarm. Named Pele's Pit, the new crater is about 600 m (1,970 ft) in diameter and its bottom is 300 m (985 ft) below the previous surface! Like the volcanoes on the Island of Hawai‘i, Lō‘ihi has grown from eruptions along its 31-km-long (19-mi-long) rift zone that extends northwest and southeast of the caldera.
It's not known when Lō‘ihi will breach sea level. We can speculate that with a growth rate of 5 m (16.4 ft) per 1000 years it will take as much as 200,000 years to reach the ocean surface. It all depends upon the eruption rate.
The name Lō‘ihi means "long" in Hawaiian and was introduced in 1955 to describe the elongate shape of the seamount. More recently, Hawaiian scholars have found that stories of "Kama‘ehu," the red island child of Haumea (earth) and Kanaloa (sea) that rises from the deep in the ocean floor may also be a reference to this submarine volcano.
Images HVO

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Yellowstone National Park, USA
Via Dr. Rebecca Williams


Cleveland volcano, Alaska, USA
Recent observations of Cleveland Volcano suggest that unrest has declined and it is unlikely that eruptive activity is continuing. Satellite observations have yielded no evidence for continuing lava effusion and there have been no detections of anomalous seismicity or infrasound from the volcano since a brief explosion on Tuesday evening (May 16) at 19:17 AKDT (03:17 May 17 UTC). Evidence for lava effusion in the summit crater was observed in satellite data on June 7, but since then observed surface temperatures have become weaker, suggesting that lava effusion has paused or ended.
The overall decline in unrest and lack of evidence for lava effusion warrants downgrading the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY
Source AVO Alaska

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Summit of Cleveland volcano on July 26th, 2016 - Photo John Lyons AVO

June 26, 2017

Soufriere Hills Volcano, Montserrat, Eastern Caribbean (Philippa)
One volcano which is special to me personally is Soufriere Hills Volcano (SHV) on the small Eastern Caribbean island of Montserrat. In the summer of 2011 I was privileged to spend a couple of months on study placement with Montserrat Volcano Observatory and saw first hand both the physical and social effects that the 6 phases of eruptions since 1995 have caused to this island.

Today we remember the 19 people who lost their lives in pyroclastic flows during an eruption of SHV on 25 June 1997. They were predominantly people who had been allowed access to the (previous) exclusion zone to tend to agricultural areas, as their produce was a major source of food for the island following previous eruptions of the volcano.

One of the farmers who escaped - Delia Ponde - recalls that they had forgotten to turn their radio on that day. A local radio station is the main means of communicating emergencies and updates to the inhabitants of Montserrat. When they got in their truck to leave their farm at the end of the working day, she happened to look back at the volcano and saw a pyroclastic flow (an avalanche of hot gas, ash, and rocks, formed by partial collapse of an eruption plume) in the distance that was headed their way. These flows are unusually quiet, but are deadly as they are powerful enough to flow uphill as well as downhill and can outpace the speed of a car. Delia calmly told her husband to drive a different route than normal. Had they driven in the other direction, they too would have succumbed.

Delia's eyewitness account can be seen around 16'30" on this episode of 'Seconds From Disaster'.

via Randall Clements / YouTube

Below are otherwise 4 videos in a series, which document the events from an eruption of Soufriere Hills Volcano the previous year so that you can better understand the events which then led to the June 1997 eruption.

via JourneysWithLaurenMillar / YouTube

Volcan Paricutin, Mexico (Philippa)
The image (below) was taken in 1947 and shows the remains of the San Juan Parangaricutiro church, which had been inundated by lava flows from Volcan Paricutin (in the background of the photo) in June 1943. The volcano came into being as part of the 600 mile long Trans-Mexican Volcanic Belt on 20 February 1943, when a small hill suddenly appeared in (farmer) Dionisio Pulido's corn field following several days of small tremors in the area. Later that afternoon a fissure (large crack) appeared in the top of the hill, which then hissed and roared as the 'hill' erupted grey ash, emitting a strong smell of sulfur. From Pulido's eyewitness report it can be interpreted that a scoria cone formed characterised by lava fountaining eruptive activity.

via Orbis Tertius (@aleph54)

rsz_volcan_paricutinThe lava flows from June 1943 necessitated the evacuation of the nearest town, and by the end of its first year of eruption, Paricutin's ash fall had reached as far as Mexico City 200 miles away. The eruptions continued until 1952, by which point the peak of the edifice was about 400m high.

The full story on Volcano Paricutin - accompanied by photos from Getty Images - can be found here:

1943-1952 The erupton of Paricutin

A vintage show reel from 1943 showing the eruption of Volcan Paricutin and how San Juan Parangaricutiro church looked beforehand can be seen here:

via PeriscopeFilm / YouTube

....and a video made with a local guide (who was born at the time of the eruption!) showing what the area looks like today can be seen here (in Mexican-Spanish dialect with English subtitles):

via Alain Fournier / YouTube

Volcan Irazu, Costa Rica (Philippa)
The amazing historic image below of Volcan Irazu was taken in 1963, one of the four years in the early 1960s when the volcano last erupted.

via Alfredo Messeguer (@Messe11)


The crater area now looks like this (see image below) and the only activity at the moment is the small-scale emission of volcanic gases and steam (water vapour) from fumaroles.

via costa-rica-guide.com


Hekla volcano, Iceland (Philippa)
This view of Hekla volcano was taken yesterday outside of LAVA, Iceland's new interactive exhibition and educational centre on all things volcano-related, which we mentioned here a few weeks ago. (volcanologist) Ben Edwards had a chance to check it out and highly recommends a visit to the centre if you are ever lucky enough to go to Iceland.

LAVA - Volcano and Earthquake exhibition, Iceland

via Ben Edwards (@lava_ice)


Volcan Llaima, Chile (Philippa)
The image below, captured at the end of last month, shows lenticular clouds over Volcan Llaima, which is one of Chile's largest and most active volcanoes, whose eruptions are characterized by lava fountaining, Strombolian activity, and lava flows. Lenticular clouds form when horizontal air flows are disrupted by, for example, volcanoes. This forms large air waves. The temperature at the crest of such waves drops to the dew point, condensing the moisture in the air to form these clouds. Because of their shape, lenticular clouds have often been mistaken for UFOs.

via Nicolas Luengo (@Lapidus91)


June 24 + 25, 2017

Volcano activity for the week of June 13 until June 19, 2017

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Bogoslof | Fox Islands (USA)
AVO reported that elevated surface temperatures and a small steam emission at Bogoslof were identified in satellite images during 13-14 June. Weakly elevated surface temperatures were detected on 16 June, and a 13-km-long steam plume was visible on 18 June. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Karymsky | Eastern Kamchatka (Russia)
KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 10-12 and 14-15 June. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Pavlof | United States
AVO reported that seismicity at Pavlof had declined since the small increase on 7 June, and no unusual activity was observed in seismic or infrasound data through 20 June. Minor steam emissions occasionally rose from the summit crater. Satellite images showed an approximately 55 km-long steam plume drifting W on 14 June, and a thermal anomaly during 15-16 and 20 June. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Rincon de la Vieja | Costa Rica
OVSICORI-UNA reported that on 15 June a diffuse plume of mainly water vapor rose 50 m above Rincón de la Vieja's crater rim. A small hydrothermal explosion from the crater with the highly acidic lake was detected around noon on 18 June. In a report posted the next day OVSICORI-UNA noted that seismicity was characterized by low-frequency events, volcano-tectonic events, and tremor with intensifying amplitude; the seismic patterns were similar to those that preceded the phreatomagmatic events on 23 May and 11 June, though the recent seismicity was not as energetic.

Sheveluch | Central Kamchatka (Russia)
KVERT reported that during 10-13 June explosions at Sheveluch produced ash plumes that rose as high as 8 km (26,200 ft) a.s.l. and drifted 1,500 km SE and NW. At 0425 on 15 June powerful explosions generated ash plumes that rose as high as 12 km (39,400 ft) a.s.l. The Aviation Color Code was raised to Red (the highest level on a four-color scale), and then back down to Orange at the end of the day. Ash plumes drifted 1,000 km NE and SW during 15-16 June. Ash fell in Klyuchi (50 km SW), Maiskoe, Kozyrevsk (115 km SW), and Atlasovo (160 km SW).

Information provided by the Smithsonian Institute

Nishinoshima (island) volcano, Japan (Janine)
Infrared photo of the renewed activity

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Mount Nyamulagira, Democratic Republic of Congo (Philippa)
The latest post from (seismologist) Christopher Jackson, who is one of the scientists involved in a forthcoming BBC documentary called 'Jungle Volcano' (see below), features Mount Nyamulagira, which is one of Africa's most active volcanoes. This is a basaltic shield volcano, i.e. similar to Kilauea in Hawaii. Its features include a summit crater lava lake, cinder cones, and fissures (cracks), the latter of which has erupted lava fountains.
via Christopher Jackson (@seis_matters)

Mt Nyamuragira DRC Chris Jackson

Stromboli, Sicily (Philippa)
Tom Pfeiffer from (touring group) Volcano Discovery observed that the eruptive activity at Stromboli volcano was more intense than usual during the first half of this month. The image below shows activity from 6 of Stromboli's vents.

Strombolian-type eruptions are relatively small-scale and occur frequently. They are the equivalent of a volcano burp: crater vent emissions of pockets of volcanic gas accompanied either by small amounts of ash or more vigorous lava fountaining and lava bombs.
via Tom Pfeiffer



The video footage (below) of Stromboli was shot in May of this year.
via Marco Fulle

(Whakaari) White Island volcano, Bay of Plenty, New Zealand
Photo of a sulfur fumarole by Jeannie Curtis @VolcanoJeannie 2017
Armand : Some small story: while I was visiting New Zealand early 2016, I was booked on a boat trip to White Island. Prior to the embarkation we decided to not board as the surf was really heavy and my wife gets motion sickness in such conditions. Later in the day we heard that the small ship had been completely destroyed. It started with an engine fire. All the passengers had had to jump into the sea to avoid burn injuries. Luckily they all were wearing life jackets, and because of the warm water they were able to float for tens of minutes until the rescue helicopters and boats were able to pick them up. A narrow escape is the best way of describing my experience. Link to the whole story.
A few days later we went for the more expensive alternative and flew to White Island by helicopter (Frontier helicopters). We had one of the most exciting trips of our life. It was late afternoon and all other tourists were gone. The 2 of us with the guide/helicopter pilot all alone walking about 1 hour in this superb active volcano crater landscape.
Whenever you visit New Zealand, put some money on the side to experience this great adventure. The friendly staff and pilots will make it a success.

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Bogoslov volcano, Alaska, USA
Vigorous steaming observed in this satellite view of #Bogoslof volcano, Alaska. Worldview satellite image collected at 23:13 UTC on June 12, 2017.
Via James Reynolds

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More than 40 explosions have reshaped Bogoslof volcano. The lava dome that rose above the sea on June 5 was destroyed during an explosion on June 10.
Via USGS Volcanoes

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Schermafbeelding 2017-06-23 om 00.14.36

June 23, 2017