A magnitude 7.5 earthquake struck the island of Vanuatu in the South Pacific Ocean early Sunday morning, the U.S. Geological Survey is reporting.
The quake hit a few minutes before 4 a.m. local time. It was centered 38 miles southwest of the town of Port-Vila and had a relatively shallow depth of 25.2 miles, according to the USGS.
The Pacific Tsunami Warning Center said the major quake had not triggered a Pacific-wide tsunami but said: "Earthquakes of this size sometimes generate local tsunamis that can be destructive along coasts located within a hundred kilometers (80 miles) of the earthquake epicenter."
There was no immediate information of any damage or casualties, but when on land quakes of this magnitude can cause widespread and heavy damage.
The quake was followed by a weaker aftershock of magnitude 5.9 some 20 minutes later.
The Vanuatu archipelago is located on the so-called "Ring of Fire," one of the most seismically active regions in the world. Port-Vila is the capital of Vanuatu and has an estimated population of 40,000 people.
No other details were immediately available.
Editor's note: This story has been updated since it was first published.