The South Pacific is shaking again.

A magnitude-5.3 earthquake struck the Vanuatu region on September 25, according to the U.S. Geological Survey, hitting at a depth of roughly 24 kilometers, or 15 miles. Its epicenter was about 350 miles east-southeast of Isangel, Vanuatu, in a remote stretch of ocean, and no significant damage or tsunami warning was reported.

But it wasn’t an isolated jolt. Vanuatu’s Meteorology and Geo-Hazards Department has recorded multiple earthquakes around the islands in recent days, including magnitude-4.8, 4.4 and 4.2 events on September 23, followed by another 4.2 on September 25.…