An earthquake struck offshore the Polynesian island nation of Tonga Sunday morning, with the U.S. Geological Survey reporting a preliminary magnitude of 5.7.

The quake hit at 10:39 a.m. EDT about 130 miles north-northwest of Tonga's capital, Nuku'alofa, Reuters reported.

El Salvador's Ministry of Environment and Natural Resources tweeted that there were no tsunami alerts as a result.

Tonga has a population of about 100,000 people. The area experienced major earthquakes in 2006, 2007 and 2009.