According to the U.S. Geological Survey, a 7.4 magnitude earthquake hit in the Pacific Ocean about 78 miles off the coast of El Salvador late Sunday night.
The earthquake struck 74 miles south of Usulutan, El Salvador, at a depth of 33 miles.
A tsunami warning was in effect for Costa Rica, Nicaragua, El Salvador, Honduras, Guatemala, Panama and Mexico.
But the Pacific Tsunami Warning Center said there is no tsunami threat to Hawaii.
There were no immediate reports of damage to coastal areas or to shipping.
After hitting Florida Keys with strong winds and rain on Sunday, Tropical Storm Isaac is now moving towards New Orleans.
It was reported that Tropical Storm Isaac had killed eight people in Haiti including three children and three people were missing in the Dominican Republic.
Isaac is forecast to become a hurricane by either late Monday or Tuesday and then strengthen to a Category 2 Hurricane.
A hurricane warning was issued for the Gulf Coast from Louisiana to the Florida Panhandle, including New Orleans.
The U.S. National Hurricane Center (NHC) said in an advisory that it might reach New Orleans and the the Gulf Coast on or near the seventh anniversary of Hurricane Katrina.
I was in Chicago when Hurricane Katrina lashed New Orleans on August 29, 2005 but I cannot really remember the details because I was only 2 years old at that time.
Hurricane Katrina killed more than 1,800 people and causing billions of dollars of damage to the Gulf Coast.
Tropical Storm Isaac lashed Cuba on Saturday.
It brought strong wind and heavy rain.
No deaths or injuries were reported.