A 6.7-magnitude earthquake struck southern Ecuador on Thursday, shattering building windows in the city of Guayaquil while leaving no immediate victims, Ecuadoran and US officials said.

The quake could be felt in at least six provinces in the Andes mountain range, the Amazon jungle and the coast in the Peru border region, said an Ecuadoran Civil Defence source.

The US Geological Survey said the earthquake's epicenter was 119 kilometers (74 miles) deep and 243 kilometers (151 miles) southeast of Ecuador's capital Quito, in the country's border region with Peru. The USGS earlier reported that the earthquake had a magnitude of 6.3 and put its epicenter in the Colombia-Ecuador border region.

The earthquake shook the Andean nation one day after a powerful 7.7-magnitude temblor struck northern Chile, killing two people.

The USGS uses the moment magnitude scale, which measures the amount of movement on the underground fault and the area of the fault that ruptured. Many seismologists now use that system rather than the Richter scale, which measures the size based upon the amount of ground shaking.