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Planchón-Peteroa activity: a new bulletin from SERNAGEOMIN 8 September 2010

Posted by admin in activity reports, Chile, eruptions, Planchón-Peteroa.
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Planchón-Peteroa: aerial view towards the east, showing the arrangement of the craters, the currently active south-western crater and deposits of ash on the icecap and snow. SERNAGEOMIN image, taken on 7 September 2010.

The Chilean state geological service SERNAGEOMIN has issued a new bulletin today on the activity at Planchón-Peteroa, reporting the outcome of an overflight of the volcanic complex which took place yesterday:

On the basis of the overflight of the area of the Planchón-Peteroa volcanic complex carried out on 7 September by SERNAGEOMIN personnel it can be concluded that Planchón volcano is maintaining eruptive activity with weak explosions, possibly of phreatomagmatic origin, similar to minor phases of the eruption recorded in 1991.

The currently active crater is the south-western, which has for several years usually shown persistent fumarolic activity.

The current eruptive activity shows local accumulations of ash in the area within 10 km of the volcano and no alterations have been observed in the glaciers of the volcanic complex.

The activity is described as consisting of ‘discrete pulses of gases and fine ash with a frequency of between 40 and 60 seconds’. These emissions create a ‘weak eruptive column of grey colour’ rising up to 200 metres above the crater, which then disperses towards Argentine territory, to the east of the volcano. The current activity at Planchón-Peteroa, according to SERNAGEOMIN, does not present a hazard to the local population, but continuous monitoring of the volcano will be carried out for as long as the activity continues. Planchón-Peteroa is currently at ‘alert level 4 Yellow’.


Planchón-Peteroa: aerial view towards the south-east, showing the western flank of the Planchón (north)-Peteroa (south) volcanic complex, with prominent ash deposits on the icecap and snow. SERNAGEOMIN image, taken on 7 September 2010.


Planchón-Peteroa: aerial view towards the east, showing the low altitude of the eruption column and the plume dispersing towards the east-south-east, over Argentine territory. SERNAGEOMIN image, taken on 7 September 2010.

Information
Global Volcanism Program: Planchón-Peteroa – summary information for Planchón-Peteroa (1507-04=)

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Chile: increased activity at Planchón-Peteroa 8 September 2010

Posted by admin in activity reports, Chile, eruptions, Planchón-Peteroa.
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Planchón-Peteroa volcano is in central Chile, on the Chile-Argentina border. The complex history of this stratovolcano has produced the present-day nested group of three volcanoes: Azufre, Planchón and Peteroa. All historical eruptive activity has originated from Peteroa – there have been several explosive eruptions of VEI=1 and VEI=2 since the 1870s. Recent fumarolic activity in 2006, 2008 and 2010 underlines that this is very much a restless active volcano.

Reports from Chile indicate that Planchón-Peteroa’s activity is currently increasing and becoming more explosive; on 4 September an Argentine Air Force flight apparently encountered ‘a column of gas and ashes’ reaching up to two kilometres altitude, and the Air Force has also said that an area of 120 square kilometres around the volcano is being affected by ashfall. The Chilean state geological service SERNAGEOMIN issued a bulletin yesterday reporting a change in the activity of Planchón-Peteroa, from its habitual fumarolic venting to ‘eruptive activity’, albeit ‘minor up to now’:

Currently and from a technical point of view, the volcano is changing to moderately explosive eruptive activity, with a phreatic-vulcanian component (solid material) in the acid lakes of the crater zone.

Occasionally during 6 September an eruption column of pyroclasts and gases was observed, black in colour, which reached up to 1,200 metres above the crater zone, with a dispersal plume reaching at least 30 kilometres in length, mostly towards the east and, in a small percentage, to the north and south.

The bulletin notes that a ‘rock-fracturing’ earthquake of magnitude 5.2 at a depth of 13.4 kilometres was recorded on 6 September some 9 kilometres south-east of the volcanic complex. SERNAGEOMIN will be installing a seismological network and working with other Chilean agencies to maintain a full programme of monitoring at Planchón-Peteroa.

There have been suggestions that the current activity may have been sparked by the February 2010 Chilean earthquake (Erik has more on this at Eruptions), which is not the first time an earthquake has been put forward as a possible cause of eruptive activity at Planchón-Peteroa: Watt, Pyle and Mather (2009) suggest (in their Table 2) that an eruption of this volcano in July 1960 may have been triggered by the earthquake of May 1960. Watt et al argue that the incidence of volcanic eruptions in the aftermath of large earthquakes is signficant enough to justify the conclusion ‘that seismic eruption triggering following large earthquakes, with delays of several months, is a significant process in volcanic arcs’ without it being possible to pin down individual eruptions as being the result of particular earthquakes, and certainly it is not possible to say that the 2010 earthquake is responsible for the current activity at Planchón-Peteroa, any more than the same could be said for 1960. There is just not enough evidence to make a solid connection, and anyone who jumps right in with a declaration that big earthquakes = more volcanic eruptions is going way too far, but it’s an important and very interesting line of research; given the complex tectonic context of Planchón-Peteroa there is clearly much more work to be done before a clear conclusion can be reached.

[Thanks to Guillermo for pointing me to Planchón.]

References
José Cembrano & Luis Lara, ‘The link between volcanism and tectonics in the southern volcanic zone of the Chilean Andes: a review’, Tectonophysics, vol. 471, issues 1-2 (9 June 2009), pp. 96-113. [doi:10.1016/j.tecto.2009.02.038]
Daniel R. Tormey, Frederick A. Frey & Leopoldo Lopez-Escobar, ‘Geochemistry of the Active Azufre—Planchon—Peteroa Volcanic Complex, Chile (35°15′S): Evidence for Multiple Sources and Processes in a Cordilleran Arc Magmatic System’, Journal of Petrology, vol. 36, no. 2 (April 1995), pp. 265-298. [doi: 10.1093/petrology/36.2.265]
Sebastian F. L. Watt, David M. Pyle & Tamsin A. Mather, ‘The influence of great earthquakes on volcanic eruption rate along the Chilean subduction zone’, Earth and Planetary Science Letters, vol. 277, issues 3-4 (30 January 2009), pp. 399-407. [doi:10.1016/j.epsl.2008.11.005]

News
Entró en actividad el volcán Peteroa, en la frontera entre Mendoza y ChileLa Capital, 6 September 2010
Preocupa actividad de volcán PeteroaLa Estrella de Concepcion, 6 September 2010
Región del Maule: Sernageomin detecta actividad irregular en volcán Planchón y monitorea el Peteroa – Radio Bío-Bío, 7 September 2010
Planchon volcano starts spewing rocks, gases, Chile’s geology service says – Bloomberg, 7 September 2010
Volcán Planchón entró en actividad eruptiva en la Región del MauleEl Mercurio, 8 September 2010

Information
Global Volcanism Program: Planchón-Peteroa – summary information for Planchón-Peteroa (1507-04=)

The Volcanism Blog

Emissions from Villarrica? 7 September 2010

Posted by admin in activity reports, Chile, Villarrica.
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Buenos Aires VAAC (home page; message archive) issued three advisories on 4 and 5 September 2010 reporting emissions from Villarrica volcano in Chile: on 4 September a thin ash plume, very light, was identified extending 60 nautical miles NE of the volcano (4 September 2130Z), and on 5 September continuous emission was reported, although it was noted that low clouds were hampering observations (5 September 0500Z). In each case the source of the information was GOES-12 satellite data. No further reports have been issued, and this activity remains unconfirmed.

(The Villarrica Visual Observation Project have a live webcam for Villarrica. There are also four Villarrica webcams accessible from the Observatorio Volcanológico de los Andes del Sur home page, although they do not always show up-to-date images.)

[If you are baffled by the language of Volcanic Ash Advisories, try our easy-to-understand guide to How to read a Volcanic Ash Advisory.]

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 7-13 July 2010 14 July 2010

Posted by admin in activity reports, Bagana, Caribbean, Dukono, Ecuador, eruptions, Guatemala, Hawaii, Indonesia, Italy, Japan, Kamchatka, Karymsky, Kilauea, Kirishima, Kliuchevskoi, Pacaya, Papua New Guinea, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Stromboli, Tungurahua, Ulawun, United States, Weekly Volcanic Activity Reports.
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Some highlights from the last week of volcanic activity courtesy the Global Volcanism Program and Sally Kuhn Sennert, including more seismic restlessness and ash venting at Soufrière Hills and some big bangs at Stromboli:

  • Soufrière Hills: seismic swarms, ash venting, ashfall, some rumbling and roaring
  • Stromboli: two major explosive events at the ever-active ‘Lighthouse of the Mediterranean’
  • Pacaya: an explosion produces ash and tephra fall, provoking small-scale evacuations

SI/USGS Weekly Volcanic Activity Report 7-13 July 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 7-13 July 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: Soufrière Hills (Montserrat), Stromboli (Italy).

Ongoing activity: Bagana (Papua New Guinea), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii USA), Kirishima (Japan), Kliuchevskoi (Russia), Pacaya (Guatemala), Sakura-jima (Japan), Shiveluch (Russia), Tungurahua (Ecuador), Ulawun (Papua New Guinea).

Note: a.s.l. = ‘above sea level’.

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SI/USGS Weekly Volcanic Activity Report 30 June – 6 July 2010 9 July 2010

Posted by admin in activity reports, Arenal, Bagana, Caribbean, Costa Rica, Dukono, Ebeko, Ecuador, eruptions, Gorely, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Miyake-jima, Papua New Guinea, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Tiatia, Tungurahua, Ulawun, 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, including an apparent revival of activity at Soufrière Hills:

  • Ebeko: explosions throwing plumes up to 1.8 km altitude, alert level raised to yellow
  • Arenal: strombolian activity shaking the glass in windows 4 km away
  • Kliuchevskoi: ash plumes to 5.3 km altitude
  • Soufrière Hills: ash venting observed for the first time since February 2010

SI/USGS Weekly Volcanic Activity Report 30 June - 6 July 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 30 June – 6 July 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: Ebeko (Russia), Gorely (Russia), Tiatia (Russia), Ulawun (Papua New Guinea).

Ongoing activity: Arenal (Costa Rica), Bagana (Papua New Guinea), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii USA), Kliuchevskoi (Russia), Miyake-jima (Japan), Pagan (Mariana Islands), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat), Tungurahua (Ecuador).

Note: a.s.l. = ‘above sea level’.

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Two explosions as Nicaragua’s San Cristóbal clears its throat 5 July 2010

Posted by admin in activity reports, Nicaragua, San Cristóbal.
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Dos grandes “eructos” de volcán San Cristóbal‘ says the headline in Nicaragua’s El Nuevo Diario newspaper: ‘two big “belches” from San Cristóbal volcano’. The eructations in question happened on Friday afternoon, 2 July 2010: two explosions from the summit crater at about 13:05 and 13:10 ejected pyroclastic material, ‘including rocks with a diameter of up to ten metres’, which caused fires in nearby grasslands. A ‘mushroom cloud’ of ash was produced by the second explosion, and light ashfall occurred in villages NW of the volcano. No damage or injuries were reported. An emergency plan was activated for the areas around the volcano, but there were no further signs of activity over the weekend. The Instituto Nicaragüense de Estudios Territoriales (INETER) described Friday’s activity as ‘normal degassing’.

News
Dos grandes “eructos” de volcán San CristóbalEl Nuevo Diario, 4 July 2010

Information
Global Volcanism Program: San Cristóbal – summary information for San Cristóbal (1404-02=)
Instituto Nicaragüense de Estudios Territoriales – INETER main page

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 23-29 June 2010 3 July 2010

Posted by admin in activity reports, Dukono, Ecuador, eruptions, Eyjafjöll, Gorely, Hawaii, Iceland, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kirishima, Kliuchevskoi, Pacific, Papua New Guinea, Russia, Sakura-jima, Shiveluch, Tungurahua, Ulawun, United States, Weekly Volcanic Activity Reports.
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Some highlights from the last fairly quiet week of volcanic activity reported by the Global Volcanism Program:

  • Gorely: new active vent observed, alert level raised to yellow
  • Tungurahua: steam, gas and ash plumes, roaring sounds, ashfall, a lahar or two
  • Kirishima: a possible eruption on 28 June
  • Kliuchevskoi: large thermal anomaly, plumes heading off in multiple directions

SI/USGS Weekly Volcanic Activity Report 23-29 June 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 23-29 June 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: Gorely (Russia), Pagan (Mariana Islands), Tungurahua (Ecuador), Ulawun (Papua New Guinea).

Ongoing activity: Dukono (Indonesia), Eyjafjallajökull (Iceland), Karymsky (Russia), Kilauea (Hawaii USA), Kirishima (Japan), Kliuchevskoi (Russia), Sakura-jima (Japan), Shiveluch (Russia).

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SI/USGS Weekly Volcanic Activity Report 16-22 June 2010 24 June 2010

Posted by admin in activity reports, Batu Tara, Caribbean, Colombia, Dukono, Ecuador, eruptions, Etna, Gaua, Gorely, Guatemala, Hawaii, Indonesia, Ioto, Italy, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Nevado del Huila, Pacaya, Papua New Guinea, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Tiatia, Tungurahua, Ulawun, United States, Vanuatu, Weekly Volcanic Activity Reports.
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Some highlights from the last week of volcanic activity reported by the Global Volcanism Program:

  • Etna: hot landslides generate ash clouds
  • Nevado del Huila: seismicity increases, sulphur dioxide plumes detected
  • Tungurahua: steam-and-ash plumes, daily ashfall
  • Kliuchevskoi: strombolian activity
  • Sakura-jima: 550 eruptions so far in 2010, a new record for this hyper-active volcano

SI/USGS Weekly Volcanic Activity Report 16-22 June 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 16-22 June 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: Etna (Italy), Gorely (Russia), Ioto (Japan), Nevado del Huila (Colombia), Pacaya (Guatemala), Tiatia (Russia), Tungurahua (Ecuador), Ulawun (Papua New Guinea).

Ongoing activity: Batu Tara (Indonesia), Dukono (Indonesia), Gaua (Vanuatu), Karymsky (Russia), Kilauea (Hawaii USA), Kliuchevskoi (Russia), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat).

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SI/USGS Weekly Volcanic Activity Report 9-15 June 2010 22 June 2010

Posted by admin in activity reports, Alaska, Bagana, Batu Tara, Bezymianny, Caribbean, Chile, Cleveland, Dukono, Ecuador, eruptions, Eyjafjöll, Fuego, Gaua, Guatemala, Hawaii, Iceland, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Melimoyu, Mexico, Nicaragua, Pacific, Papua New Guinea, Popocatépetl, Russia, Sakura-jima, San Cristóbal, Shiveluch, Soufrière Hills, Tungurahua, Ulawun, United States, Vanuatu, Weekly Volcanic Activity Reports.
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Some highlights from the last week of volcanic activity reported by the Global Volcanism Program:

  • Melimoyu: increased seismicity leads to heightened alert level
  • Tungurahua: daily explosions and ashfall
  • Eyjafjallajökull: earthquakes, steam plumes
  • Soufrière Hills: rockfalls and pyroclastic flows

SI/USGS Weekly Volcanic Activity Report 9-15 June 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 9-15 June 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: Bezymianny (Russia), Cleveland (Alaska, USA), Melimoyu (Chile), Pacaya (Guatemala), San Cristóbal (Nicaragua), Sarigan (Mariana Islands), Tiatia (Russia), Tungurahua (Ecuador), Ulawun (Papua New Guinea).

Ongoing activity: Bagana (Papua New Guinea), Batu Tara (Indonesia), Dukono (Indonesia), Eyjafjallajökull (Iceland), Fuego (Guatemala), Gaua (Vanuatu), Karymsky (Russia), Kilauea (Hawaii USA), Kliuchevskoi (Russia), Popocatépetl (Mexico), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat).

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SI/USGS Weekly Volcanic Activity Report 2-8 June 2010 9 June 2010

Posted by admin in activity reports, Alaska, Batu Tara, Bezymianny, Cleveland, Dukono, Ecuador, eruptions, Eyjafjöll, Guatemala, Hawaii, Iceland, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mexico, Pacaya, Papua New Guinea, Philippines, Popocatépetl, Russia, Sakura-jima, Santa María, Shiveluch, Taal, Tungurahua, Ulawun, 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:

  • Pacaya: strombolian activity ejects material 200 m into the air
  • Taal: elevated seismicity and inflation causing concern
  • Tungurahua: explosions, ashfall, plumes up to 9 km altitude
  • Eyjafjallajökull: fluctuating tremor, fresh ashfall, plumes up to 4.5 km altitude

SI/USGS Weekly Volcanic Activity Report 2-8 June 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 2-8 June 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: Bezymianny (Russia), Cleveland (Alaska, USA), Pacaya (Guatemala), Taal (Philippines), Tiatia (Russia), Tungurahua (Ecuador), Ulawun (Papua New Guinea).

Ongoing activity: Batu Tara (Indonesia), Dukono (Indonesia), Eyjafjallajökull (Iceland), Karymsky (Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Russia), Popocatépetl (Mexico), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia).

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