The magnitude-7.6 earthquake that struck Wednesday near Costa Rica's Pacific coast left one person dead and two others missing, authorities said.
The quake's epicenter was located beneath the ocean floor about 220 kilometers (137 miles) northwest of this capital, the Ovsicori seismological observatory said.
After initially estimating the strength of the temblor at 6.7, Ovsicori revised the reading upward to magnitude-7.6, consistent with the adjusted figure from the U.S. Geological Survey, which originally reported a magnitude-7.9 event.
The U.S. government's Pacific Tsunami Warning Center issued an alert for the Pacific coast from Mexico southward to Peru.
The PTWC subsequently narrowed the scope of the warning to Costa Rica, Nicaragua and Panama and then canceled the alert altogether.
Officials in Costa Rica and Panama, relying on advice from their own experts, quickly ruled out the chance of a tsunami.
A 55-year-old woman died of a heart attack brought on by the earthquake and two people were reported missing in the coastal town nearest the epicenter.
The temblor toppled electric polls and shattered windows on the Pacific coast, according to the Red Cross and state-owned utility ICE.
Citizen journalists sent photos and video of the damage to television stations via social media.
President Laura Chinchilla issued an appeal for calm at a brief press conference during a break in meetings with emergency management officials. EFE