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Smithsonian/USGS Weekly Volcanic Activity Report 25-31 May 2011 2 June 2011

Posted by admin in activity reports, Aso, Batu Tara, Costa Rica, Dieng Volcanic Complex, Ecuador, Grímsvötn, Hawaii, Iceland, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kizimen, Kliuchevskoi, Mexico, Papua New Guinea, Poás, Popocatépetl, Russia, Sakura-jima, Shiveluch, Taal, Tungurahua, Ulawun, United States, Weekly Volcanic Activity Reports.
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The Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been issued for the week 25-31 May 2011. The report is compiled by Sally Kuhn Sennert. Notable volcanic events this week include:

  • Dieng Volcanic Complex: evacuations following increase in gas emissions and seismic activity
  • Grímsvötn: an eruption characterized by explosive activity and ash plumes, with limited ashfall
  • Kilauea: the level of the Pu’u’O’o lava lake continued to fluctuate
  • Taal: water temperature, acidity and water level all rose in Taal’s Main Crater Lake, and there was an increase in seismic activity

SI/USGS Weekly Volcanic Activity Report 25-31 May 2011

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The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 25-31 May 2011 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: Aso (Japan), Dieng Volcanic Complex (Indonesia), Grímsvötn (Iceland), Kliuchevskoi (Russia), Ulawan (Papua New Guinea).

Ongoing activity: Batu Tara (Indonesia), Karymsky (Russia), Kilauea (Hawaii, USA), Kizimen (Russia), Popocatépetl (Mexico), Poás (Costa Rica), Sakura-jima (Japan), Shiveluch (Russia), Taal (Philippines), Tungurahua (Ecuador).

Note: ‘a.s.l.’ = ‘above sea level’.

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SI/USGS Weekly Volcanic Activity Report, 6-12 October 2010 14 October 2010

Posted by admin in activity reports, Arenal, Argentina, Batu Tara, Caribbean, Chile, Costa Rica, Dukono, Ecuador, eruptions, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Piton de la Fournaise, Planchón-Peteroa, Poás, Reventador, Russia, Sakura-jima, Sangay, Shiveluch, Soufrière Hills, United States, Weekly Volcanic Activity Reports.
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The Weekly Volcanic Activity Report for 6-12 October 2010 is compiled by Sally Kuhn Kennert and published by the Global Volcanism Program. Some selected highlights:

  • Piton de la Fournaise: continuing high level of activity, with elevated seismicity and summit inflation
  • Planchón-Peteroa: plumes rising to altitudes between 3 and 6 km a.s.l.
  • Poás: phreatic eruptions throw material tens of metres above the surface of the crater lake

SI/USGS Weekly Volcanic Activity Report 6-12 October 2010

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The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 29 September – 5 October 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: Piton de la Fournaise (Réunion Island), Planchón-Peteroa (Chile), Reventador (Ecuador).

Ongoing activity: Arenal (Costa Rica), Batu Tara (Indonesia), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Russia), Poás (Costa Rica), Sakura-jima (Japan), Sangay (Ecuador), Shiveluch (Russia), Soufrière Hills (Montserrat).

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Costa Rica: simultaneous eruptions at Turrialba and Poás 15 September 2010

Posted by admin in activity reports, Costa Rica, eruptions, Poás, Turrialba.
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In volcanically active Costa Rica two volcanoes chose to erupt simultaneously yesterday, says the English-language news site Inside Costa Rica: both Turrialba and Poás erupted what journalists insist on calling ‘smoke’ early on the morning of Tuesday 14 September. As the two volcanoes are 55 kilometres apart the effect of simultaneity will have been lost on anyone actually present at either of them. The eruptions do not seem to have been particularly significant: experts from OVSICORI regard the activity as normal, with clear skies and lack of wind making the volcanoes’ habitual emissions more visible than usual. OVSICORI volcanologists will be visiting the volcanoes to evaluate the effects of the activity.

News
Turrialba and Poás volcanoes in simultaneous eruptions – Inside Costa Rica, 15 September 2010

Information
Global Volcanism Program: Poás – summary information for Poás (1405-04=)
Global Volcanism Program: Turrialba – summary information for Turrialba (1405-07=)
Observatorio Vulcanológico y Sismológico de Costa Rica – OVSICORI website

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 24 February-2 March 2010 4 March 2010

Posted by admin in activity reports, Caribbean, Costa Rica, Ecuador, eruptions, Fuego, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mayon, Mexico, Pacaya, Philippines, Poás, Popocatépetl, Russia, Sakura-jima, Santa María, Semeru, Shiveluch, Soufrière Hills, Tungurahua, United States, Weekly Volcanic Activity Reports.
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Some highlights from the last week of volcanic activity reported by the Global Volcanism Program:

  • Poás: grey and sulphur-scented sediment thrown out by a phreatic explosion
  • Santa María: ash plumes from the Santiaguito lava dome complex reached 2.8-3.1 km altitude
  • Tungurahua: ash plumes reached 6.5-8.0 km altitude

SI/USGS Weekly Volcanic Activity Report 24 February-2 March 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 24 February-2 March 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: Poás (Costa Rica), Semeru (Indonesia), Soufrière Hills (Montserrat).

Ongoing activity: Fuego (Guatemala), Karymsky (Russia), Kilauea (USA), Kliuchevskoi (Russia), Mayon (Philippines), Pacaya (Guatemala), Popocatépetl (Mexico), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Tungurahua (Ecuador).

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Christmas Day eruption at Poás captured on video 6 January 2010

Posted by admin in Costa Rica, Poás.
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You may recall our report of a phreatomagmatic display that Poás volcano in Costa Rica put on to celebrate Christmas Day: well, you can now see a video of the event – ‘Central Georgia couple captures video of erupting volcano’ (also at YouTube).

There is also an interview with tourist Tom Wellman, who made the video. Strange remark 1: ‘this type of volcano doesn’t put out liquid lava. Instead it puts out a dry lava with steam’. Strange remark 2: ‘Tom says that this is the first time in the history of Costa Rica that anyone has recorded video of an erupting volcano’. Not really, try this.

Costa Rican newspaper La Nación has some nice still pictures of the Poás eruption, taken by Kristina Kremer.

UPDATE 11 February 2010. Tom Wellman has provided some clarification regarding his video: please see his comment below.

[Hat tip: Damon Hynes via Eruptions.]

The Volcanism Blog

Catching up: Mayon, Redoubt, Poás, Saudi Arabia… 31 December 2009

Posted by admin in activity reports, Alaska, Costa Rica, Mayon, Philippines, Poás, Redoubt.
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The Volcanism Blog Christmas Break lasted a little longer than intended, as round here the internet celebrated the holiday season by breaking down and we’ve only just got it back. Here’s a summary of what’s been going on in the meantime.

Mayon has so far stopped short of the big explosive eruption that everyone has been expecting (although the full moon might do it). Some 50,000 people have spent Christmas as evacuees in temporary shelters, and it does not look as if they will be returning to their homes any time soon. Meanwhile the authorities are losing patience with people who refuse to quit the danger zone: power and water supplies to evacuated areas are to be cut off, and the Philippine Commission on Human Rights has okayed ‘forcible evacuation’ measures. The latest Phivolcs bulletin (no. 18, 31 December 2009) reports continuing ‘extrusion of lava and rolling down of incandescent lava fragments’. Poor visibility has hampered observations of the volcano, but no ash explosions have been observed during clear periods. The last significant explosion (to 9,000 feet/2,740 metres) was reported by Tokyo VAAC at 00:17 UTC on 30 December. The alert status for Mayon remains at the second-highest level of 4; the level of activity has declined somewhat over the last few days, but Phivolcs warns that the threat remains.

In Alaska, Redoubt stirred for the first time in five months or so, altering its usual seismic behaviour to produce a series of small repetitive earthquakes near its summit. The Alaska Volcano Observatory raised the alert level for Redoubt to Yellow/Advisory on 28 December 2009. The latest AVO bulletin (30 December 2009, 21:46 UTC) reports that the earthquake activity has declined markedly.

Poás in Costa Rica revealed itself to have a great sense of occasion, putting on a fine display of phreatic activity on Christmas morning. A mixture of sediments and water from the crater lake and volcanic blocks was ejected to a height of more than 500 metres at 09:50 on Christmas Day, startling visiting parties of festive tourists.

Remember the earthquakes in the Al-Ais region of Saudi Arabia earlier this year? The last tremors were reported in June. It seems that there were some more earthquakes on 18 December, causing alarm among local residents who have only recently returned to their homes after being evacuated in May and June. The Saudi Geological Service has said that the tremors are normal for this volcanic region of the country, no eruption is imminent, and that there is no need for new evacuations.

The Global Volcanism Program has published two weekly volcanic activity reports over the holiday period, one covering 16-22 December 2009 and one for 23-29 December 2009. Full posts for both of these will be published here next week.

Happy New Year!

The Volcanism Blog

Phreatic eruption at Poás, Costa Rica 21 September 2009

Posted by admin in activity reports, Costa Rica, Poás.
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Poás volcano produced a phreatic eruption on Friday morning, 18 September, reports Costa Rican newspaper La Nación. The eruption projected water and sediment to a height of 300 metres above the surface of the crater lake. It is the northern of the volcano’s two summmit crater lakes, Lago Caliente, which is the site of frequent phreatic eruptions; the most recent, a smaller event, was in January this year.

The report also mentions that scientists visiting the summit of Poás have found burning sulphur on the north wall of the crater lake, the first time this phenomenon has been seen since 1994. Recent high temperatures and low rainfall have reduced the water volume in the highly acidic lake, and degassing from the crater has intensified with the gas plume – ‘bright yellow’ in certain areas – reaching 400 metres in height when measured on 16 September. The sulphurous plume may present a hazard for visitors to the volcano, which is one of Costa Rica’s most popular tourist attractions.

News
Volcán Poás hizo erupción de agua y sedimentosLa Nación, 20 September 2009

Information
Global Volcanism Program: Poás – information about Poás (1405-04=)
Observatorio Vulcanológico y Sismológico de Costa Rica – Volcanological and Seismological observatory of Costa Rica (OVSICORI)
Volcán Poás – profile of Poás volcano from OVSICORI

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report, 14 January 2009 – 20 January 2009 22 January 2009

Posted by admin in activity reports, Barren Island, Chaitén, Dieng Volcanic Complex, Dukono, eruptions, Fuego, Galeras, Karymsky, Kilauea, Kliuchevskoi, Llaima, Nevado del Huila, Poás, Rabaul, Sakura-jima, Shiveluch, Soufrière Hills, Tungurahua, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 14 January 2009 - 20 January 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 14 January 2009 to 20 January 2009 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Dieng Volcanic Complex (Java, Indonesia), Poas (Costa Rica), Rabaul (Papua New Guinea).

Ongoing activity: Barren Island (Andaman Islands), Chaiten (Chile), Dukono (Halmahera, Indonesia), Fuego (Guatemala), Galeras (Colombia), Karymsky (Kamchatka, Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Kamchatka, Russia), Llaima (Chile), Nevado del Huila (Colombia), Sakura-jima (Japan), Shiveluch (Kamchatka, Russia), Soufriere Hills (Montserrat), Tungurahua (Ecuador).

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Small phreatic eruption at Poás, Costa Rica 16 January 2009

Posted by admin in activity reports, Costa Rica, eruptions, Poás.
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A magnitude 6.1 earthquake took place at 19:21 UTC (13:21 local time) on 8 January 2009 near La Cinchona, Costa Rica, some 6km east of Poás volcano. Poás is a highly active stratovolcano with a recent history of frequent phreatic and phreatomagmatic eruptions. The close proximity of the 8 January earthquake to the volcano has led to concerns that the quake, which produced rockfalls within the crater, could have disturbed the volcano, possibly provoking some kind of eruptive activity.

Ovsicori reports (see source below) that on 12 January 2009 there was a small phreatic eruption at Poás volcano:

The event can be described as a small phreatic eruption with dimensions of 50m diameter and 15m height which occurred in the centre of the lake in the active crater … This can be interpreted as a small eruption of a bubble of gas which was released suddenly from the fractured hydrothermal system.

The implication is that the hydrothermal system, described by Ovsicori as ‘already fractured and shallow’ was disrupted by the earthquake.

A report in Spanish on the 8 January 2009 earthquakes from the Observatorio Vulcanológico y Sismológico de Costa Rica (Ovsicori) is available in PDF at this link. The Ovsicori report on the Poás activity of 12 January 2009 quoted above can be found, also as a PDF, here.

News
Thirteen dead in Costa Rica quake – BBC News, 10 January 2009
Bodies found as quake toll rises – Press Association, 11 January 2009
Death toll in Costa Rica quake rises to 20 – Associated Press, 14 January 2009
Thousands on alert for aftershocks – Inside Costa Rica, 14 January 2009
Preocupados costarricenses por erupciones en el volcán Poás – Prensa Latina, 14 January 2009
Experts say Poás activity normal – Inside Costa Rica, 15 January 2009

Information
Global Volcanism Program: Poás – information about Poás (1405-04=)
Observatorio Vulcanológico y Sismológico de Costa Rica – Volcanological and Seismological observatory of Costa Rica (Ovsicori)
Volcán Poás – profile of Poás volcano from Ovsicori

The Volcanism Blog

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