1:07am Update (AP): David Walsh, an oceanographer with the Pacific Tsunami Center in Ewa Beach, Hawaii, said only a 20-centimeter swell was registered off Acajutla, El Salvador.
The U.S. Geological Survey is reporting that a strong magnitude-7.4 earthquake has struck off the coast of El Salvador and a tsunami warning has been issued.
There were no immediate reports of damages or injuries after the quake struck at 10:37 p.m. Sunday.
The earthquake was located 86 miles (138 kilometers) south-southwest of San Miguel, the USGS reported on its web site.
The temblor took place at a depth of 32.9 miles (53 kilometers).
A tsunami warning is in effect for Costa Rica, Nicaragua, El Salvador, Honduras, Guatemala, Panama and Mexico.