| Bahía Solano Fault | |
| Other Name: | Falla Bahía Solano, Utría Fault, Utría-Bahía Solano Fault |
| Namedfor: | Bahía Solano |
| Pushpin Map: | Colombia |
| Pushpin Relief: | 1 |
| Region: | Pacific/Chocó |
| State: | Chocó |
| Cities: | Nuquí |
| Coordinates: | 5.8869°N -77.3631°W |
| Range: | Serranía del Baudó |
| Part Of: | Pacific thrust faults |
| Length: | 290.6km (180.6miles) |
| Width: | up to 5km (03miles) |
| Strike: | 347 ± 13 |
| Dip: | West |
| Dip Angle: | unknown |
| Displacement: | 0.2-/yr |
| Plate: | Panama, Coiba, North Andean |
| Status: | Active |
| Earthquakes: | 1970 Bahía Solano (6.5) |
| Type: | Thrust fault |
| Movement: | Reverse |
| Rockunit: | Uva Formation, Baudó Basalt |
| Age: | Quaternary |
| Orogeny: | Andean |
The Bahía Solano Fault (Spanish; Castilian: Falla Bahía Solano), Utría Fault or Utría-Bahía Solano Fault is a westward dipping thrust fault in the department of Chocó on the Pacific Coast of Colombia. The fault has a total length of 290.6km (180.6miles) and runs along an average north–south strike of 347 ± 13 from the Panama-Colombia border to Bajo Baudó. The fault is partly offshore in the bays of Solano and Utría and crosses the Chocó Basin and the coastal Serranía del Baudó. Movement of the fault produced the 6.5 1970 Bahía Solano earthquake.
The fault is named after Bahía Solano, Chocó.[1]
The Bahía Solano Fault extends along the Pacific Coast of Colombia, bordering the Panama, Coiba, Malpelo and North Andes Plates.[2] It bounds a structural valley between the Solano Bay and Utría Bay, and displaces the Eocene turbidites of the Uva Formation in the south,[3] and Cretaceous oceanic Baudó Basalts in the north,[4] The fault forms a well developed and continuous fault line (scarp),[1] and the brecciated zone of the fault reaches 5km (03miles) in width.[5] The peninsulas of Cabo Corrientes and Bahía Solano are composed of oceanic crust displaced by the Bahía Solano Fault.[6]
Segments of the fault have been called Utría Fault,[7] [8] [9] [10] [6] and Utría-Bahía Solano Fault.[11]
The slip rate of the fault is estimated at between 0.2mm1mm per year.[1] The fault is active and produced the 1970 Bahía Solano earthquake with a moment magnitude of 6.5 and a depth of 15km (09miles).[12] [13] The earthquake was followed by 123 aftershocks in the period from September 26 to October 7, 1970.[14]