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Signs of increasing activity at Galeras 20 October 2010

Posted by admin in activity reports, Colombia, Galeras.
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The Observatorio Vulcanológico y Sismológico de Pasto reports (bulletin of 19 October) that Galeras volcano is continuing to show increasing signs of activity after a relatively quiet few weeks. Galeras has remained at the third-highest alert level of Yellow since 7 September, when the alert level was lowered from Orange following the eruption of 25 August.

Seismic activity at Galeras continues to fluctuate, with an increase in seismic signals associated with fluid movements within the volcano since 15 October. This increased seismicity is also associated with increased gas emissions, and in the ash content of those emissions, and there has been an increase in deformation at the summit of the volcano and thermal anomalies have been detected in the crater area. All these parameters, INGEOMINAS concludes, indicate ‘the presence of magmatic material at shallow levels which continues to intrude towards the surface’.

In anticipation of a potential eruption Colombia’s Sistema Nacional para la Prevención y Atención de Desastres has advised the people living near Galeras to ‘be attentive to the recommendations of the authorities’ (they tend not to be, as as rule).

References to volcano alert levels on this blog are not authoritative and are not necessarily up to date. You should always check with official sources for the latest alert levels.

For all our Galeras coverage: Galeras « The Volcanism Blog.

News
El volcán Galeras presenta signos de reactivaciónEl Tiempo, 20 October 2010
Alerta por incremento de la actividad del vólcan GalerasEl País, 20 October 2010
Alerta por incremento en actividad volcánica del GalerasTerra Colombia, 20 October 2010
Volcán Galeras incrementó actividad volcánica – Radio Santa Fe, 20 October 2010

Information
Global Volcanism Program – Galeras – summary information for Galeras (1501-08=)
Portal Corporativo de INGEOMINAS – Instituto Colombiano de Geología y Minería
Observatorio Vulcanológico y Sismológico de Pasto – Pasto volcanological observatory main page

The Volcanism Blog

Colombian volcano update: Galeras, Huila, Machín 15 September 2010

Posted by admin in activity reports, Colombia, Galeras, Machín, Nevado del Huila.
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Galeras erupted on 25 August: the Colombian geological authority INGEOMINAS described the eruption as ‘of low explosivity’. Ashfall was reported up to 30 km NW of the volcano, and an evacuation order was issued affecting about 7000 people (although as usual few people heeded the evacuation) there were no casualties and no reports of damage. The alert level was raised to the highest level of Red on 25 August and lowered to Orange on the following day. Tremors continued for 12 hours following the eruption before gradually declining. Evidence gathered during an overflight by INGEOMINAS on 26 August suggested that a new crater had been opened by the eruption on Galeras’s north flank. On 7 September INGEOMINAS lowered the alert level to Yellow, at which level Galeras remains. The latest bulletin (14 September) reports a low level of seismic activity and minor gas-and-ash emissions. There have been some signs of deformation since 9 September at the summit of the volcano.

Nevado del Huila has a tendency to produce sulphur dioxide emissions, and SO2 plumes from the volcano have been detected frequently since the middle of June. The level of seismicity and its intensity increased, with a greater number of shallow hybrid earthquakes beneath the main summit (Pico Central). Because of this change in Huila’s seismic behaviour, INGEOMINAS raised the alert level for the volcano from Yellow to the second-highest level of Orange on 15 June. Low-level activity continued during June, July and August, with SO2 emissions, fluctuating seismicity and small ash emissions being reported. The alert level was returned to Yellow on 6 July and remained at that level until 9 September, when a marked increase in volcanic tremor and emissions/incandescence at the summit (‘very recurrent and energetic pulses of tremor, associated with pulsing surface emissions of gas, ashes and incandescent material’) prompted INGEOMINAS to raise the alert level to Orange. The Colombian authorities have advised local residents to leave the area, and municipalities around the volcano have been making emergency preparations. The most recent bulletin of 14 September reports continuing high levels of seismicity with pulses of tremor associated with emissions of gas, ash and incandescent material, whitish-blue and grey emissions columns reaching up to 2 kilometres above the summit, and high concentrations of SO2. Nevado del Huila remains on Orange alert, ‘eruption probable within days or weeks’.

Machín experienced a volcanic-tectonic earthquake of magnitude 2.6 at 3.87 km depth yesterday, which was felt by residents in nearby towns. Seismic unrest was noted at Machín earlier this summer: on 24 July INGEOMINAS reported a ‘seismic crisis’ characterized by an increase in relatively shallow volcanic-tectonic earthquakes.  Machín has been on Yellow alert for a long time, and remains at that level.

Information
Global Volcanism Program: Galeras – summary information for Galeras (1501-08=)
Global Volcanism Program: Nevado del Huila – summary information for Nevado del Huila (1501-05=)
Global Volcanism Program: Machín – summary information for Machín (1501-04=)
Instituto Colombiano de Geología y Minería – main page for INGEOMINAS

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 25-31 August 2010 1 September 2010

Posted by admin in activity reports, Alaska, Batu Tara, Caribbean, Cleveland, Colombia, Dukono, Ecuador, Ekarma, eruptions, Galeras, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Manam, Nevado del Huila, Papua New Guinea, Reventador, Russia, Sakura-jima, Sangay, Shiveluch, Sinabung, Soufrière Hills, Suwanose-jima, United States, Weekly Volcanic Activity Reports.
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Some highlights from a very full week of volcanic activity as reported by the Global Volcanism Program (report compiled by Sally Kuhn Sennert):

  • Ekarma: a steam plume and evidence of a possible recent small eruption reported from this volcano in the Kuril Islands
  • Galeras: an eruption on 25 August, and ashfall up to 30 km from the vent
  • Sinabung: two significant eruptions cause the evacuation of 20,000 to 30,000 local residents
  • Nevado del Huila: ash emissions accompanied by tremor

SI/USGS Weekly Volcanic Activity Report 25-31 August 2010

Click on the map for a larger version (1280 x 898 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 25-31 August 2010 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Ekarma (Russia), Galeras (Colombia), Manam (Papua New Guinea), Sinabung (Indonesia).

Ongoing activity: Batu Tara (Indonesia), Cleveland (Alaska, USA), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii USA), Kliuchevskoi (Russia), Nevado del Huila (Colombia), Reventador (Ecuador), Sakura-jima (Japan), Sangay (Ecuador), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan).

Note: a.s.l. = ‘above sea level’.

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SI/USGS Weekly Volcanic Activity Report 18-24 August 2010 26 August 2010

Posted by admin in activity reports, Ambrym, Batu Tara, Caribbean, Colombia, Dukono, eruptions, Galeras, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mexico, Nicaragua, Pacific, Pagan, Papua New Guinea, Popocatépetl, Russia, Sakura-jima, San Cristóbal, Sangay, Shiveluch, Soufrière Hills, Suwanose-jima, Ulawun, United States, Vanuatu, Weekly Volcanic Activity Reports.
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Here’s the regular review of the past week’s volcanic activity, compiled by Sally Kuhn Sennert and published by the Global Volcanism Program:

  • Galeras: erupted on 25 August
  • Popocatépetl: produced a 1-km steam plume on 23 August
  • San Cristóbal: a report of a steam plume on 20 August

SI/USGS Weekly Volcanic Activity Report 18-24 August 2010

Click on the map for a larger version (1280 x 898 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 18-24 August 2010 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Galeras (Colombia).

Ongoing activity: Ambrym (Vanuatu), Batu Tara (Indonesia), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii USA), Kliuchevskoi (Russia), Pagan (Mariana Islands), Popocatépetl (Mexico), Sakura-jima (Japan), San Cristóbal (Nicaragua), Sangay (Ecuador), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan), Ulawun (Papua New Guinea).

Note: a.s.l. = ‘above sea level’.

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Volcanoes of southern Colombia: overflights, 15 February 2010 22 February 2010

Posted by admin in activity reports, Azufral, Cerro Negro (Colombia), Colombia, Cumbal, Galeras, volcano monitoring.
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Galeras volcano, 15 February 2010 (INGEOMINAS)
The summit of Galeras (image from 15 February 2010 INGEOMINAS overflight).

The INGEOMINAS volcanological observatory at Pasto has images from overflights carried out on 15 February 2010 over the volcanoes of southern Colombia: Galeras, Cumbal, Azufral and the Chiles-Cerro Negro complex (click on the name to access the images for each volcano).

Of these four, only Galeras is currently showing any signs of restlessness and is on alert level III, yellow (‘changes in the behaviour of the volcanic activity’). Cumbal and Azufral are both at alert level IV, green (‘volcano active and behaviour stable’), while Cerro Negro isn’t considered to need an alert level. Cumbal’s most recent eruptive activity was an explosive eruption in 1926, Azufral’s last known eruption was 1000 years ago, while Cerro Negro may have erupted in 1936, although this is unconfirmed.

Cerro Negro volcano, 15 February 2010 (INGEOMINAS)
Cerro Negro (image from 15 February 2010 INGEOMINAS overflight).

Cumbal volcano, 15 February 2010 (INGEOMINAS)
Summit of Cumbal volcano (image from 15 February 2010 INGEOMINAS overflight).

Azufral volcano, 15 February 2010 (INGEOMINAS)
Azufral volcano, showing Laguna Verde crater lake (image from 15 February 2010 INGEOMINAS overflight).

Information
Global Volcanism Program: Azufral – information for Azufral (1501-09=)
Global Volcanism Program: Cerro Negro de Mayasquer – information for Cerro Negro de Mayasquer (1501-11=)
Global Volcanism Program: Cumbal – information for Cumbal (1501-10=)
Global Volcanism Program: Galeras – information for Galeras (1501-08=)

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 3-9 February 2010 10 February 2010

Posted by admin in activity reports, Bezymianny, Caribbean, Colombia, Dukono, Ecuador, eruptions, Fukutoku-Okanoba, Galeras, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Pacaya, Pacific, Russia, Sakura-jima, Sarychev Peak, Shiveluch, Soufrière Hills, Suwanose-jima, Tungurahua, United States, Weekly Volcanic Activity Reports.
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Some of the volcanic activity headlines this week:

  • Fukutoku-Okanoba: Surtseyan explosions from this undersea volcano
  • Pacaya: Strombolian activity reaching 30 metres above the cone
  • Kliuchevskoi: Strombolian activity projecting material up to 300 metres above the crater
  • Sakura-jima: lava fountain activity reaching up to 1 km in height, and an ash plume alive with lightning

SI/USGS Weekly Volcanic Activity Report 3-9 February 2010

Click on the map for a larger version (1280 x 898 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 3-9 February 2010 has been released but is not yet available on the Global Volcanism Program website because of technical problems caused by severe weather in the eastern United States. The following is a summary and not a substitute for the full report.

UPDATE: Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 3-9 February 2010 is now available at the Global Volcanism Program website.

New activity/unrest: Bezymianny (Russia), Fukutoku-Okanoba (Japan), Pacaya (Guatemala).

Ongoing activity: Dukono (Indonesia), Galeras (Colombia), Karymsky (Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Russia), Sakura-jima (Japan), Sarychev Peak (Russia), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan), Tungurahua (Ecuador).

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SI/USGS Weekly Volcanic Activity Report 30 December 2009-5 January 2010 9 January 2010

Posted by admin in activity reports, Africa, Barren Island, Caribbean, Chaitén, Chile, Colombia, Congo (Dem. Rep.), Costa Rica, Ecuador, eruptions, Galeras, Guatemala, Hawaii, India, Indian Ocean, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mayon, Nevado del Huila, Nyamuragira, Papua New Guinea, Philippines, Piton de la Fournaise, Rabaul, Rinjani, Russia, Sakura-jima, Sangay, Santa María, Shiveluch, Soufrière Hills, Suwanose-jima, Tungurahua, Turrialba, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 30 December 2009 - 5 January 2010

Click on the map for a larger version (1280 x 898 pixels). The map title gives the end of the period covered as 6 January 2010, it should be 5 January 2010. Sorry about that.

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 30 December 2009 – 5 January 2010 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Galeras (Colombia), Mayon (Philippines), Nyamuragira (Democratic Republic of Congo), Piton de la Fournaise (Réunion), Rinjani (Indonesia), Tungurahua (Ecuador), Turrialba (Costa Rica).

Ongoing activity: Barren Island (India), Chaitén (Chile), Karymsky (Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Russia), Nevado del Huila (Colombia), Rabaul (Papua New Guinea), Sakura-jima (Japan), Sangay (Ecuador), Santa María (Guatemala), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan).

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The Galeras eruption of 2 January 2010 5 January 2010

Posted by admin in activity reports, Colombia, eruptions, Galeras.
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In Colombia, ever-active Galeras volcano erupted in the evening of 2 January 2010, causing ashfall nearly 40 km away and producing a plume that reached more than 12,000 metres altitude (here’s an ash advisory for the eruption issued at 02:28 UTC on 3 January 2010, reporting ash at FL400, which is 40,000 feet/12,200 metres*). No injuries were reported, and people in the neighbouring city of Pasto, where the annual Festival de Blancos y Negros is currently under way, were reported to be calm. Evacuation orders for 8000 people were in force, and around 900 seem actually to have gone to the shelters, which is a relatively good response for the area around Galeras.

Marta Calvache of INGEOMINAS confirmed in an interview with Caracol Radio that the seismic signal produced by this eruption was the largest recorded at Galeras in recent months.

The Observatorio Vulcanológico y Sismológico de Pasto reported that an explosive eruption of Galeras began at 19:43 local time on 2 January 2010. The detailed bulletin on the eruption, published by the Pasto observatory at 23:45 that night, reported that the eruption lasted 30 minutes, with the most intense phase lasting 10 minutes. Blocks and ash at high temperatures were erupted, starting fires on the forested flanks of the volcano, and ashfall was reported to the north-west of Galeras in towns up to 37 km distant. The energy level of this eruption, according to INGEOMINAS, was equivalent to that of the 17 January 2008 eruption (described by locals at the time as ‘the strongest in more than twelve years’), and was nine times greater than that estimated for the eruption of 20 November 2009. The alert level for Galeras was raised to Red during the eruption, and lowered again to Orange on the morning of 3 January.

It was a clear night in Pasto on 2/3 January 2010, so the INGEOMINAS Galeras webcam had a good view of the volcano. As a result there is a great video of the eruption as it happened, available here (MPG, 16.4 MB).

* Not sure how to make sense of a volcanic ash advisory? Click here for an explanation.

For all our Galeras coverage: Galeras « The Volcanism Blog.

News
Colombian volcano erupts, evacuation ordered – Reuters, 2 January 2010
Galeras volcano erupts – Colombia Reports, 2 January 2010
Nueva erupción del Galeras es la más grande de los últimos meses: Ingeominas – Caracol Radio, 2 January 2010
Volcán Galeras hizo erupciónEl Espectador, 2 January 2010
Erupción del volcán Galeras no dejó víctimasEl Tiempo, 3 January 2010
De roja a naranja pasa alerta por volcán GalerasEl Tiempo, 3 January 2010

Information
Global Volcanism Program – Galeras – summary information for Galeras (1501-08=)
Portal Corporativo de INGEOMINAS – Instituto Colombiano de Geología y Minería
Observatorio Vulcanológico y Sismológico de Pasto – Pasto volcanological observatory main page

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 9-15 December 2009 19 December 2009

Posted by admin in activity reports, Caribbean, Chaitén, Chile, Colombia, Concepción, Dukono, eruptions, Fuego, Galeras, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Manam, Mayon, Nevado del Huila, Nicaragua, Pacaya, Papua New Guinea, Philippines, Piton de la Fournaise, Rabaul, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Suwanose-jima, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 9-15 December 2009

Click on the map for a larger version (1280 x 898 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 9-15 December 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Concepción (Nicaragua), Galeras (Colombia), Mayon (Philippines), Piton de la Fournaise (Réunion), Soufrière Hills (Montserrat).

Ongoing activity: Chaitén (Chile), Dukono (Indonesia), Fuego (Guatemala), Karymsky (Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Russia), Manam (Papua New Guinea), Nevado del Huila (Colombia), Pacaya (Guatemala), Rabaul (Papua New Guinea), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Suwanose-jima (Japan).

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Alert level raised to ‘orange’ at Galeras 10 December 2009

Posted by admin in activity reports, Colombia, Galeras.
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INGEOMINAS has raised the alert level at Galeras to the second-highest level of Orange, ‘eruption probable within days or weeks’, following changes in the volcano’s seismic behaviour over the past 24 hours or so. ‘Tornillo’ type earthquakes have been particularly evident, a type of seismicity that has been characteristic of the lead-up to previous eruptions. As per standard procedure, an evacuation of nearby areas has been ordered.

For all our Galeras coverage: Galeras « The Volcanism Blog.

News
Ordenan evacuar las faldas del volcán GalerasEl Pais, 10 December 2009
Authorities raise Galeras alert level to ‘orange’Colombia Reports, 10 December 2009

Information
Global Volcanism Program – Galeras – summary information for Galeras (1501-08=)
Portal Corporativo de INGEOMINAS – Instituto Colombiano de Geología y Minería
Observatorio Vulcanológico y Sismológico de Pasto – Pasto volcanological observatory main page

The Volcanism Blog

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