An earthquake occurred at 02:59 local time on 12 December 1979, with the epicenter just offshore from the border between Ecuador and Colombia, near the port city of Tumaco. With a moment magnitude of 8.2 and a maximum Mercalli intensity of IX (Violent), it triggered a major tsunami, which was responsible for most of the estimated 300–600 deaths. The hardest hit area was Colombia's Nariño Department.
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