By DANICA KIRKA and AUDREY McAVOY, Associated Press

HONOLULU (AP) — One of this century’s most powerful earthquakes struck off the coast of Russia and generated tsunami warnings and advisories for a broad section of the Pacific, including Alaska, Hawaii and the U.S. West Coast and as far south as New Zealand. Now warnings are being downgraded in most areas, though advisories remain in place as more aftershocks are possible.

The quake registered a magnitude of 8.8 and was centered off the coast of the Kamchatka Peninsula in Russia’s Far East, according to the U.S. Geological Survey. It struck early Wednesday local time, which was still Tuesday in the U.S.

Here’s what to know:

What a tsunami is

Tsunamis are waves triggered by earthquakes, underwater volcanic eruptions and submarine

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