An earthquake with a preliminary magnitude of 6.6 struck the Gulf of California early Sunday morning, the U.S. Geological Survey said.
The temblor struck at 1:14 a.m. and had a depth of 6 miles. The epicenter was 37 miles south-southwest of Topolobampo, Mexico, and it was preceded by two other earthquakes of magnitude 4.9 and 5.3. Mexico's national coordinator of civil protection, Luis Felipe Puente, sent a tweet saying that there were no immediate reports of damage in Sinaloa state, where Los Mochis lies, or in Baja California Sur on the other side of the gulf.
Mexico, which lies on three tectonic plates, is one of the world's most seismically active regions.
