New Delhi, July 17 -- A powerful 7.3-magnitude earthquake struck off the coast of Alaska on Wednesday, prompting a tsunami warning for parts of South Alaska and the Alaska Peninsula, the U.S. Geological Survey (USGS) reported.

The quake occurred at approximately 12:37 pm local time (2037 GMT), with its epicenter located about 54 miles (87 kilometers) south of Sand Point, a small island community. The seismic event was relatively shallow, originating at a depth of 20.1 kilometers beneath the ocean floor.

The National Tsunami Warning Center (NTWC) in Palmer, Alaska, confirmed the occurrence of a tsunami and said that "some impacts are expected."

The warning covered coastal regions from Kennedy Entrance-approximately 40 miles southwest of...