A strong earthquake struck the Andes mountains of southwestern Colombia on Sunday though there were no immediate reports of injuries or serious damage, Colombian and US monitoring services said.
The magnitude 7.3 quake struck at 1631 GMT some 10 kilometers (six miles) northwest of the Colombian town of Isnos, and 344 kilometers northeast of Ecuador's capital Quito, said the US Geological Service, which monitors earthquakes worldwide.
The USGS initially said it was a magnitude 7.4 quake, then revised it down to a 7.1 quake.
The quake "occurred as a result of normal faulting deep within the subducting Nazca slab," a major fault line that runs along most of the western coast of South America, the USGS said.
In Colombia, the National Seismological Network the epicenter of the quake was 169 kilometers underground, and that the quake was of magnitude 7.1.
The director of Colombia's disaster relief service, Carlos Ivan Marquez, said that there were only reports of minor damage to homes in one village.
The temblor shook buildings and rattled windows in 10 central and western provinces, but despite police and firefighters reported no damage.
The quake also shook Ecuador's capital Quito and other parts of the country for about 30 seconds, and was felt particularly in tall buildings in the capital.
Radio stations in Ecuador interrupted their broadcasting to report on the quake, which also prompted many posts on Twitter.
Both Colombia and Ecuador are located in a region prone to seismic activity.
A seismograph monitors a volcano in North Sumatra province, Indonesia in 2010. A strong earthquake struck the Andes mountains of southwestern Colombia on Sunday though there were no immediate reports of injuries or serious damage, Colombian and US monitoring services said.