Magnitude 4.3 Quake Preceded Western Colombia's Devastating 7.4 Mainshock

A magnitude 4.3 earthquake struck Cumbal, Nariño, on August 7, 2026, at 8 km depth, Colombia's SGC reported. Three days later, a magnitude 7.4 mainshock killed at least 111 people and collapsed 61 buildings. Whether the earlier quake was a foreshock — a smaller tremor preceding a larger one — requires further seismological study, but the timing and location are notable.