A strong 7.4-magnitude earthquake struck in the Pacific Ocean off the coast of El Salvador on Sunday night, but no casualties were reported and fears of a tsunami soon dissipated.

The Pacific Tsunami Warning Center cancelled a warning for all of Central America and Mexico early on Monday morning after reporting that a small tsunami wave of roughly 4 inches above normal sea level had been generated.

The epicentre of the quake on Sunday night was located 111km south of the city of Puerto El Triunfo and occurred at a depth of 54km.

"When no major waves are observed for two hours after the estimated time of arrival or damaging waves have not occurred for at least two hours then local authorities can assume the threat is passed," the Center said.

Source: Agencies