A TSUNAMI warning has been issued after a strong earthquake off the Pacific Coast of Central America has shaken the region.

It came just after a hurricane barrelled into the Caribbean coasts of Nicaragua and Costa Rica.

Emergency services in El Salvador said on Twitter there were no immediate reports of damage at a national level, but urged those living along the country's Pacific coast to withdraw up to 1 kilometre away from the shore following Thursday's quake.

The 7.0 magnitude quake, initially reported as a magnitude 7.2, was very shallow at 10.3 km below the seabed, which would have amplified its effect.

Its epicentre was located some 149 km south-southwest of Puerto Triunfo in El Salvador, according to the U.S. Geological Survey.

The Pacific Tsunami Warning Center warned that tsunami waves of up to one metre could hit the Pacific coasts of Nicaragua and El Salvador after the quake.

Nicaraguan President Daniel Ortega declared a state of emergency due to the quake and Hurricane Otto, which landed on the country's southeastern coast earlier on Thursday, his spokeswoman said.

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