The Armenia, Colombia earthquake happened on 25 January 1999 in Armenia, Colombia. This area has a high seismic risk because of the triple junction that is at the corner of the South American Plate where the Nazca, Cocos and Pacific plates converge . The Nazca and Caribbean plates, which are along the western border of Colombia, collide against and plunge beneath the South American Plate, generating most of the Colombia’s seismic activity. Colombia, located on the northwestern corner of the South American Plate, experiences earthquakes because of the subduction zone and the shallow crustal fault.

Websites
Risk Mangement Solutions,Inc.,https://www.rms.com/Publications/Colombia_Earthquake.pdf, extracted 22-02-2010

Wikipedia,http://en.wikipedia.org/wiki/1999_Armenia,_Colombia_earthquake, extracted 22-02-2010