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. The Galeras volcano erupted explosively, producing a ballistic expulsion of rocks in an eastward direction reaching about three kilometers (1.8 miles). 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. 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. TORs can be considered as a specific type of LP event with a long-duration coda that is composed of harmonic oscillations. What type of volcano is Galeras? Two caldera forming events have occurred at the volcano. Seismicity at Galeras during April-December 2013. 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. 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). Geological history. Galeras has been an active volcano for at least a million years, with andesite as the dominant product. Galeras volcano above the city of Pasto Columbia What followed is known as the Galeras disaster. Galeras. Galeras volcano is located in southern Colombia close to the border with Ecuador. 560,000 years ago, and sometime between 40,000 and 150,000 years ago. 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). Galeras is the light green area near the center of the image. The active cone, with a small summit pit, is the red feature on the lower right edge of the caldera (crater) wall. It is the most active volcano in Colombia. The first eruption was dated December 7th 1580. 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. The column of material belched out in the eruption rose nine to 6.2 miles into the air, the statement said. 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. 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