A strong magnitude-6.5 earthquake struck in the remote Qinghai province of northwestern China on Monday, the U.S. Geological Survey said. There were no immediate reports of casualties. The quake's epicenter was 1,120 miles (1,800 kilometers) west of Beijing, the USGS said. It struck at a depth of 6.2 miles (10 kilometers) at 9:22 a.m. local time (0122 GMT), the agency said. China's Earthquake Administration confirmed the earthquake, but said it had a magnitude of 6.3. There were no immediate reports of casualties, said Zhang, a spokesman for the earthquake administration in Qinghai. "We contacted the local authorities, but we are still investigating the situation for any damage or injuries,'' said Zhang, who gave only his surname as is common with Chinese officials. China's far west is fairly earthquake-prone. A 7.9 magnitude earthquake on May 12 devastated parts of Sichuan province, just east of Tibet, killing 70,000 people and leaving 5 million homeless.