(Adds datelines, comments from Ecuador president, details on previous earthquakes)
By Alexandra Valencia and Mitra Taj
QUITO/LIMA, Feb 22 (Reuters) - A deep magnitude-7.5 earthquake struck the Peru-Ecuador border region early on Friday morning, the U.S. Geological Survey said, causing tremors that the Ecuadorian president said were felt around the country.
The quake's epicenter was in a sparsely populated area 224 km (140 miles) east-southeast of Ambato, Ecuador, at a depth of 132 km. The USGS's initial reading assessed the quake, which occurred at 5:17 a.m. local time (1017 GMT), at magnitude 7.7.
There was no risk of a tsunami being triggered, according to the Pacific Tsunami Warning Center, and there were no initial reports of casualties or damage.
Ecuadorian President Lenin Moreno said on Twitter that preliminary reports "do not indicate major damage," though he added that provincial response teams had been activated and that the tremors had been "felt throughout the country."
One resident in Cuenca, Ecuador, 253 km (157 miles) from the epicenter, described the temblor as very strong, while a second resident there reported experiencing "a good 30-second shake," according to witness statements on the European-Mediterranean Seismological Centre website.
A magnitude-7.1 earthquake struck Peru's southern coast in January 2018, killing one person, injuring scores more and causing roads and homes to collapse. A 7.8-magnitude quake in Ecuador killed around 700 people in 2016. (Reporting by Mitra Taj in Lima, Alexandra Valencia in Quito and Jason Neely and John Stonestreet in London; Writing by Adam Jourdan; Editing by Alison Williams and Jeffrey Benkoe)
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