A powerful earthquake measuring 6.2 on the open-ended Richter scale struck Colombia's Pacific coastline near the border with Ecuador on Sunday, Colombian authorities said.

The quake shook much of southwest Colombia, but early reports gave no indications of victims or destruction.

Colombia's Geographical and Mining Institute said the epicenter was located in El Chorro, in the department of Narino, on the border with Ecuador, and had a depth of 32 kilometers (20 miles).

The US Geological Survey measured the quake at 6.9 magnitude on its scale, and said it struck at 8:49 pm (0149 GMT) some 140 kilometers north-northeast of Tumaco, and 166 kilometers southwest of Buenaventura, Colombia's main port on the Pacific.

The epicenter was at a depth of eight kilometers, the USGS said.

The head of Colombia's national disaster prevention office, Luz Amanda Pulido, told Caracol broadcast network that despite the intensity of the quake there were no reports of victims.

Narino Governor Eduardo Zuniga also reported no victims.

In Ecuador, the country's Geophysical Institute described the event as "a moderate intensity earthquake" that was felt along the northern coast, with no reports of victims.

"Damages in Ecuador are not expected," the Institute said.