MEXICO CITY — A strong earthquake shook communities along the Gulf of California on Sunday, but there were no immediate reports of damage.

The U.S. Geological Survey said the magnitude 6.6 quake struck at 1:14 a.m. local time at a depth of 6 miles. The offshore epicenter was 48 miles south-southwest of Los Mochis.

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.

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