| Buesaco-Aranda Fault | |
|---|---|
| Falla Buesaco-Aranda | |
  | |
| Etymology | Buesaco & vereda Aranda |
| Coordinates | 01°20′14.3″N 77°11′36.8″W / 1.337306°N 77.193556°W |
| Country |  Colombia |
| Region | Andean |
| State | Nariño |
| Cities | Pasto |
| Characteristics | |
| Range | Central Ranges, Andes |
| Part of | Romeral Fault System |
| Length | 29 km (18 mi) |
| Strike | NE-SW |
| Dip | Vertical |
| Displacement | 1–5 mm (0.039–0.197 in)/yr |
| Tectonics | |
| Plate | North Andean |
| Status | Active |
| Earthquakes | 1995 Pasto (ML 5.0) |
| Type | Strike-slip fault |
| Movement | Dextral |
| Age | Quaternary |
| Orogeny | Andean |
The Buesaco-Aranda Fault (Spanish: Falla Buesaco-Aranda) is a dextral strike-slip fault in the department of Nariño in southwestern Colombia. The fault has a total length of 29 kilometres (18 mi) and runs along an average northeast to southwest strike in the Central Ranges of the Colombian Andes. The 1995 Pasto earthquake is associated with the active fault showing high amounts of displacement. The earthquake caused seven fatalities.