A tsunami has hit coastal areas of Russia’s Kuril Islands and Japan’s large northern island of Hokkaido after a powerful, 8.8-magnitude earthquake off the coast of Russia early Wednesday.

A 6.7-magnitude earthquake struck Russia’s Kuril Islands on Sunday, following a series of aftershocks since the record 8.7 quake on July 30. No tsunami alert has been issued. Authorities remain on alert as seismic activity continues in the region.

The quake comes days after an 8.8-magnitude tremor in the region triggered tsunami alerts across Asia and the Pacific