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Latest news from Galeras volcano
vendredi, mai 17, 2013
A small series of ash emissions occurred in the morning of 16 May, following a weak increase in seismic activity during the past week.
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jeudi, mai 16, 2013
Internal / external activity has been low with weak earthquake activity (although at somewhat increasing tendency) and steaming observed. Pasto reports low values of SO2 emissions.
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Galeras volcanComplex stratovolcano 4276 m / 14,029 ft
Colombie, 1.22°N / -77.37°W Condition actuelle: Activité petite ou avertissement éruption imminente (3 sur 5) Galeras webcams / live data
Dernière mise à jour: 17 mai 2013 (sporadic ash emissions)
Style éruptif tipique: Explosive Eruptions du volcan Galeras: 1535, 1580, 1616, 1641-43, 1670-1736, 1754-56, 1796-1801, 1823, 1828-34, 1834, 1836(?), 1865-70, 1889, 1891, 1923, 1924-27, 1930, 1932, 1933(?), 1936, 1947, 1950, 1973(?), 1974-83, Feb-May 1989, Jan 1990 - July 1992, Jan-June 1993, Mar-May 2000, June 2002, July 2004 - Feb 2005, Nov 2005 - July2006, Oct 2007 - Jan 2008, Oct 2008 - 2010 Derniers séismes proches:
Introduction:Galeras is one of Colombia's most frequently active volcanoes. The dominantly andesitic volcano has been active for more than 1 million years, and two major caldera collapse eruptions took place during the past 100,000 years. Several collapse events have produced debris avalanches that swept to the west and left a large horseshoe-shaped caldera inside which the modern cone has been constructed.Major explosive eruptions in the past thousands of years have produced widespread tephra deposits and pyroclastic flows that swept all but the southern flanks. A central cone slightly lower than the caldera rim has been the site of numerous small-to-moderate historical eruptions since the time of the Spanish conquistadors. The fatal eruption in 1993 Galeras became active again in 1988 after 10 years of dormancy. It became infamous when it erupted on 14 January 1993, killing six volcanologists and three tourists who were inside the crater when it exploded. The group was part of an scientific conference excursion and their final decision to enter the crater, pushed forth by team leader Stanley Williams (who miracoulously survived), was and still is highly debated: the fatal decision was made despite the observation of a significantly increased number of particular earthquakes (tornillos), which had preceded previous eruptions and also started to occur in the days before the eruption. |
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