Earthquake counts are for four types of events: volcano-tectonic (VT), long-period (LP), tremor (TRE) expressed both in terms of # of events and duration, and hybrid (HYB); events labeled "Unclassified" were described by SGC as earthquakes that did not correspond to the current categories. Location:South America, Colombia, Type: Stratovolcano Active,Dormant, Extinct: Active Last known eruption: 1993, Size: elevation: 4,276 meters (14,029 ft) above sea level The Galeras volcano is the most active volcano in Colombia. What type of volcano is Galeras? TORs can be considered as a specific type of LP event with a long-duration coda that is composed of harmonic oscillations. The active cone, with a small summit pit, is the red feature on the lower right edge of the caldera (crater) wall. The first eruption was dated December 7th 1580. Galeras volcano is located in southern Colombia close to the border with Ecuador. Its dominant product is andesite, an igneous rock. The city of Pasto, with a population of 300,000, is shown in orange near the bottom of the image, just 8 kilometers (5 miles) from the volcano. The Galeras volcano erupted explosively, producing a ballistic expulsion of rocks in an eastward direction reaching about three kilometers (1.8 miles). Galeras has been an active volcano for at least a million years, with andesite as the dominant product. Galeras. Eruption in 1993 After 10 years of dormancy, in 1988 Galeras became active. Located in southwest Colombia, 4,270-m high Galeras Volcano rises 1,600 m above Pasto, the capital city and economic nucleus of Narino Province (Figure 1). Two caldera forming events have occurred at the volcano. Galeras is the light green area near the center of the image. Seismicity at Galeras during April-December 2013. Galeras has been an active volcano for at least a million years. Types of Volcanos: Volcanoes are fissures on the crust of the Earth that can release lava, volcanic ash, and gases from an inside magma chamber. The volcanic complex consists of several small calderas, cinder cones and a stratovolcano. Of six eruptions that occurred between July 1992 and June 1993, five … At about 9:30 am on January 14th 1993 Stanley Williams lead his team into the crater of Galeras, where it’s lava dome smoldered and fumaroles gushed volcanic gases. Galeras volcano above the city of Pasto Columbia What followed is known as the Galeras disaster. 560,000 years ago, and sometime between 40,000 and 150,000 years ago. Pasto is located on the eastern slope of the volcano, about 7–11 km from the crater. Geological history. The stratigraphy around the volcano records the most prominent activity of the volcano to be pyroclastic flows and is what makes up the most bulk of the hazards surrounding the volcano (Artunduaga, 1997). The column of material belched out in the eruption rose nine to 6.2 miles into the air, the statement said. Unusual low-frequency seismic events, called ‘tornillos’ (‘screws’) at the Observatorio Vulcanológico y Sismológico de Pasto (OVSP), have been observed at Galeras volcano during 1992–1993. It is the most active volcano in Colombia.
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