A deep earthquake with a magnitude of 7.5 has struck the Peru-Ecuador border region, the United States Geological Survey says.
The quake's epicentre on Friday morning was in a sparsely populated area 224km east-southeast of Ambato, Ecuador, at a depth of 132km.
The USGS's initial reading had assessed the quake, which occurred at 5.17am , (9.17pm AEDT) at magnitude 7.7.
There was no risk of a tsunami being triggered, the Pacific Tsunami Warning Center said, and there were no initial reports of casualties or damage.
One resident in Cuenca, Ecuador, 250km from the epicentre, described the temblor as very strong, while a second resident in the same city reported experiencing "a good 30 second shake", according to witness statements on the European-Mediterranean Seismological Centre website.
