A 7.0-magnitude earthquake struck Saturday off the coast of Antarctica, with authorities issuing a tsunami warning for researchers at Chile’s Eduardo Frei base on the frigid continent, followed by a minor quake near capital Santiago, emergency officials said.

The quake struck at 8:36 pm (2336 GMT) about 210 kilometers (130 miles) east of the Eduardo Frei base at a depth of 10 kilometers (6 miles), Chile’s National Emergency Office said, urging evacuation from “the beach area of the Antarctic” ahead of a possible tsunami.

At 9.07 p.m. local time, a tremor of magnitude 5.6 struck the Chile-Argentina border region, the GFZ German Research Center for Geosciences said, at a depth of 133 km and 30 kilometer east of Santiago, Reuters reported.