HAGATNA, Guam -- The U.S. Geological Survey said an undersea earthquake with a preliminary magnitude of 6.7 has shaken Guam.

There were no immediate reports of damage in the U.S. territory Saturday morning. The Pacific Tsunami Warning Center in Honolulu said the quake failed to generate a destructive, widespread tsunami.

The U.S. Geological Survey said the quake struck at 7:51 a.m. at a depth of 54.4 miles. It was located 125 miles west-southwest of Hagatna, Guam, and 250 miles southwest of Saipan in the neighboring Northern Mariana Islands.

Guam is west of the international date line, about 3,700 miles southwest of Hawaii.