A massive magnitude 8.8 earthquake struck off Russia’s Pacific coast, triggering tsunami warnings and evacuations of coastal areas in Hawaii and alerts along the United States’ West Coast.

The intense quake — about 85 miles off the east coast of Russia’s Kamchatka Peninsula — was one of the most powerful earthquakes ever recorded, and the world’s largest since 2011.

In the U.S., initial tsunami waves washed ashore on Hawaii’s island of Oahu, sending people scrambling to evacuate.

Residents were urged to leave beaches and low-lying areas for higher ground and to take shelter on at least the fourth floor of a building. Sirens sounded across the Hawaiian islands 10 minutes after each hour for the three hours leading up to the expected impact as a part of a statewide warning system.

Hawaii Gov. Josh Green told reporters early Wednesday that the state had “not seen a wave of consequence,” calling it a “great relief.”

Other parts of the Pacific U.S. — coastal areas of Alaska, Oregon, Washington and California — were also placed under tsunami advisories that have since been lifted.

Tsunami waves were recorded in Monterey, California, and San Francisco overnight, but none caused significant issues.