| Rosas-Julumito Fault | |
|---|---|
| Falla de Rosas-Julumito | |
  | |
| Etymology | Rosas, vereda Julumito |
| Coordinates | 02°21′38″N 76°42′54″W / 2.36056°N 76.71500°W |
| Country |  Colombia |
| Region | Andean |
| State | Cauca |
| Cities | Popayán |
| Characteristics | |
| Range | Central Ranges, Andes. |
| Part of | Romeral Fault System |
| Length | 43.3 km (26.9 mi) |
| Strike | 026.9 ± 7 |
| Dip | West |
| Dip angle | Moderate to high |
| Displacement | 0.2–1 mm (0.0079–0.0394 in)/yr |
| Tectonics | |
| Plate | North Andean |
| Status | Active |
| Earthquakes | 1983 Popayán earthquake (Mw 5.5) |
| Type | Oblique thrust fault |
| Movement | Reverse dextral |
| Rock units | Popayán Formation |
| Age | Quaternary |
| Orogeny | Andean |
The Rosas-Julumito Fault (Spanish: Falla de Rosas-Julumito) is an oblique dextral strike-slip fault in the department of Cauca in southwestern Colombia. The fault is part of the megaregional Romeral Fault System and has a total length of 43.3 kilometres (26.9 mi) and runs along an average northeast to southwest strike of 026.9 ± 7 in the Central Ranges of the Colombian Andes. The fault is associated with the 1983 Popayán earthquake that partially destroyed Popayán, the capital of Cauca, and led to more than 300 fatalities. A maximum moment magnitude earthquake of 6.8 is estimated for the fault.