digplanet beta 1: Athena
Share digplanet:

Agriculture

Applied sciences

Arts

Belief

Business

Chronology

Culture

Education

Environment

Geography

Health

History

Humanities

Language

Law

Life

Mathematics

Nature

People

Politics

Science

Society

Technology

Galeras (Urcunina)
Volcán Galeras - Pasto - Colombia.jpg
Galeras, December 2005
Elevation 4,276 m (14,029 ft)[1]
Location
Location Nariño, Colombia
Range Andes
Coordinates 1°13′0″N 77°22′0″W / 1.21667°N 77.36667°W / 1.21667; -77.36667Coordinates: 1°13′0″N 77°22′0″W / 1.21667°N 77.36667°W / 1.21667; -77.36667[1]
Geology
Type Complex volcano
Volcanic arc/belt North Volcanic Zone
Last eruption 2012 to 2013

Galeras (Urcunina among the 16th-century indigenous people) is an Andean stratovolcano in the Colombian department of Nariño, near the departmental capital Pasto. Its summit rises 4,276 metres (14,029 ft) above sea level. It has erupted frequently since the Spanish conquest, with its first historical eruption being recorded on December 7, 1580.[2] A 1993 eruption killed nine people, including six scientists who had descended into the volcano's crater to sample gases.[3] It is currently the most active volcano in Colombia.

Geological history[edit]

Galeras has been an active volcano for at least a million years, with andesite as the dominant product.[4] Two major caldera-forming eruptions have occurred, the first about 560,000 years ago in an eruption which expelled about 15 cubic kilometres (3.6 cu mi) of material. The second some time between 40,000 and 150,000 years ago, in a smaller but still sizable eruption of 2 cubic kilometres (0.48 cu mi) of material. Subsequently, part of the caldera wall has collapsed, possibly due to instabilities caused by hydrothermal activity, and later eruptions have built up a smaller cone inside the now horseshoe-shaped caldera.

In light of its violent eruptive history and proximity to the 450,000 people of Pasto, Galeras was designated a Decade Volcano in 1991, identifying it as a target for detailed study as part of the United Nations' International Decade for Natural Disaster Reduction.

Eruptive history[edit]

Galeras is considered the most active volcano in Colombia, followed by Nevado del Ruiz. Its earliest activity during the Holocene has been dated at 7050 BC ± 1000 years through radiocarbon dating. Other eruptions similar to this event include those in 3150 BC ± 200 years, 2580 BC ± 500 years, 1160 BC ± 300 years, 490 BC ± 100 years, and in 890 AD ± 200 years. Typically these eruptions consist of a central vent explosion, conducive to an explosive eruption causing pyroclastic flows and/or lahars. Eruptions in more recent times, which have been recorded consist of those in 1535, December 1580, July 1616, 1641, 1670, 1754, November 1796, June 1823, October 1828, 1834, October 1865, July 1889, 1891, December 1923, October 1924, October 1932, February 1936, July 1947, January 1950, 1974, February 1989, January 1990, January 1993, March 2000, June 2002, July 2004, November 2005, and October 2007. Reported incidents with no official proof occurred in 1836, 1930, 1933, and 1973.[5]

1993 eruption[edit]

Further information: Galeras tragedy

Galeras became active again in 1988 after 10 years of dormancy.

A Decade Volcano conference in the city of Pasto, in 1993, ended in disaster when several of the scientists present mounted an impromptu expedition on 14 January to the crater of Galeras. An eruption occurred unexpectedly while they were at the summit, resulting in the deaths of six scientists and three tourists.[6]

Elements in the media made the event controversial by suggesting the expedition leader, geologist Stanley Williams, who survived along with four others, had ignored safety procedures. A prediction had been made three days before the eruption based on B-Type activity seen on a seismograph. Seismic B-types had been used successfully to predict eruptions on other volcanoes. However, the prediction was based simply on the one seismographic printout viewed in the light of previous history of Galeras, without any additional scientific measurements showing any serious activity within the volcano.[citation needed]

21st-century activity[edit]

The Galeras Volcano, aerial image by NASA showing its activity. City of Pasto on the right.

Activity at a low level has continued at Galeras, with small explosions occasionally dusting nearby villages and towns with ash. The volcano has continued to be well studied, and predictions of eruptions at the volcano have improved. One phenomenon, which seems to be a reliable precursor to eruptive activity, is a low-frequency seismic event known as a tornillo event. These have occurred before about four-fifths of the explosions at Galeras, and the number of tornillo events recorded before an eruption is also correlated with the size of the ensuing eruption.

More than 100 minor tremors were felt during a major eruption in April 2002, although no damage or injury was reported. An eruption in November 2005 forced an evacuation of the dangerous area surrounding the volcano, and about 9,400 people from nearby villages (most of them farmers) were ordered to leave. The city of Pasto, about 9 kilometres (5.6 mi) from the volcano, was blanketed by a layer of ash after the volcanic explosion, forcing the residents to don goggles and face masks.

Numerous minor tremors and ash emissions since March 2006 culminated on 12 July 2006 in three explosive eruptions, producing an ash and gas column reaching an altitude of 8 kilometres (5.0 mi). Rock falls and pyroclastic flows were reported from towns as distant as Consacá, 11.4 kilometres (7.1 mi) west of the main crater. The Colombian government has repeatedly ordered evacuations to temporary shelters, of more than 8500 people residing in the highest risk areas surrounding the volcano,[7][8] with hopes of eventual assistance toward permanent relocation.[9]

Space radar image of Galeras Volcano. City of Pasto at bottom

On January 17, 2008, the volcano erupted around 20:06 (local) (01:06 UTC). There were no immediate reports of injuries or serious property damage. Later the experts confirmed partial damage in the national and local TV towers.[10][11]

Then, on February 14, 2009, the volcano erupted around 19:10 (local) (00:10 UTC).[12] Some 8,000 residents were evacuated, and there were no immediate reports of injuries or serious property damage. As in 2005, the city of Pasto was blanketed by a layer of ash after the volcanic explosion (due to the direction of the wind). The local authorities ordered two water treatment plants near Galeras to shut down.[13]

On March 13, 2009, Galeras erupted twice at around 15:55 and 17:00 (local time). Ash fell on Pasto and some other towns near the volcano, where an evacuation was ordered but reportedly ignored. No injuries or damage were reported.[14]

2010 eruption[edit]

The volcano erupted on January 3, 2010, forcing the evacuation of 8,000 people.[15] This is the 10th such eruption of the volcano in the past year, and the first of 2010. Colombian authorities also stated that it could remain volatile in the weeks to come.

Galeras erupted again on August 31,2010 with an ash plume visible in the air. The eruption, which was described as non-explosive, caused authorities to raise an alert for neighboring towns.[16]

Notes[edit]

  1. ^ a b "Galeras". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=1501-08%3D. Retrieved 2008-12-27.
  2. ^ (Spanish) PASTO: Geographical, Economics and Culture
  3. ^ Eruption: A Survivor's Tale, Scholastic
  4. ^ "Global Volcanism Program: Galeras". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=1501-08%3D.
  5. ^ "Galeras: Eruptive History". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=1501-08%3D%26volpage%3Derupt. Retrieved February 12, 2009.
  6. ^ Baxter, P.J.; Gresham A. (1997). "Deaths and injuries in the eruption of Galeras Volcano, Colombia, 14 January 1993". Journal of Volcanology and Geothermal Research 77: 325–338. Bibcode:1997JVGR...77..325B. doi:10.1016/S0377-0273(96)00103-5. 
  7. ^ Colombia volcano provokes alert, BBC News, July 13, 2006
  8. ^ Reporte de actividad eruptiva de Galeras, Julio 13 de 2006
  9. ^ Colombia: Galeras Volcano OCHA Situation Report No. 4
  10. ^ http://intranet.ingeominas.gov.co/pasto/images/7/75/Crateres_de_impacto_erupcion_Galeras_ene_17_2008_sector_sur_crater.jpg
  11. ^ "Few persuaded to flee Colombia volcano". The Associated Press via San Francisco Chronicle. January 17, 2008. 
  12. ^ "8,000 evacuated as Colombia volcano stirs: officials". AFP via Google News. February 15, 2009. 
  13. ^ Associated Press (February 15, 2009). "Galeras volcano erupts in southwestern Colombia". PR-Inside.com. 
  14. ^ Eruptions of Galeras Volcano Situation Report No 1, United Nations Office for the Coordination of Humanitarian Affairs (OCHA), 16 March 2009.
  15. ^ "Evacuation after Colombia volcano erupts". Television New Zealand. 3 January 2010. Retrieved 30 September 2011. 
  16. ^ "'Red alert' issued for Colombian volcano after non-explosive eruption". CNN. August 26, 2010. 

References[edit]

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Galeras — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

12368 news items

El País Viajes (blog)

El País Viajes (blog)
Tue, 11 Nov 2014 23:52:30 -0800

El mismo autor informa (en su célebre “Vocabulario y refranero criollo”) que en el censo general de la provincia de Buenos Aires de 1881 se consigna la existencia de 150 mensajerías con galeras, “que disponían de 262 vehículos, 935 empleados fijos y ...
 
Diario de Mallorca
Thu, 20 Nov 2014 21:48:45 -0800

J. C. palma El Ayuntamiento de Palma modificará la actual ordenanza que regula el servicio de galeras con el fin de garantizar el buen estado de los animales, además de introducir algunas mejoras en la prestación del servicio. Así lo confirmaron los ...

El Mundo

El Mundo
Thu, 13 Nov 2014 03:00:03 -0800

El grupo MÉS per Palma reclama que se mejore el servicio de las galeras turísticas con formación en materia de historia y patrimonio de la ciudad para los conductores, así como con medidas para proteger el bienestar de los caballos como evitar que ...
 
La Voz de Galicia
Sat, 22 Nov 2014 20:04:57 -0800

La Xunta de Goberno del Concello de Santiago aprobó este viernes la recepción de la urbanización del entorno del nuevo edificio residencial de Galeras, cuyos cooperativistas ocuparán en las próximas semanas. Este paso tiene implicaciones para la USC, ...

El Correo Gallego

La Voz de Galicia
Mon, 24 Nov 2014 19:56:15 -0800

Que la operación urbanística del viejo hospital de Galeras esté enquistada desde el 2001 y que no se haya desbloqueado ni en el bum del ladrillo habla de forma cristalina sobre su dificultad. De ahí que la Universidade también haya pedido formalmente ...
 
La Voz de Galicia
Wed, 29 Oct 2014 21:03:30 -0700

El contrato para la construcción del centro de salud de Galeras lo firmaron ayer la directora xeral de Recursos Económicos del Servizo Galego de Saúde, Lourdes Vilachán Angueira, y el representante de la Unión Temporal de Empresas que va a edificarlo, ...
 
El Correo Gallego
Thu, 30 Oct 2014 20:00:00 -0700

Bastante antes de que eso ocurra, lo que sí pretende es hacer caja al fin con la venta de la parcela del viejo hospital provincial, en Galeras, susceptible de enajenación inmediata y para el que la normativa urbanística autoriza un uso dotacional privado.

euronews

euronews
Mon, 17 Nov 2014 15:58:37 -0800

Hundreds of people walked along dirt roads from the Galeras neighbourhood where the sisters lived, following a car carrying the wooden coffins inside a glass case adorned with flowers. Draped across Maria Jose's coffin was the Miss Honduras sash she ...
Loading

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight