A mysterious and highly active undersea volcano off the Pacific Coast could erupt by the end of this year, scientists say. Nearly a mile deep and about 700 miles northwest of San Francisco, the ...

A mysterious and highly active undersea volcano off the Pacific Coast could erupt by the end of this year, scientists say. Nearly a mile deep and about 700 miles northwest of San Francisco, the ...

LOS ANGELES — A mysterious and highly active undersea volcano off the Pacific Coast could erupt by the end of this year, scientists say. Nearly a mile deep and about 700 miles northwest of San ...

An undersea volcano erupted near the island nation of Tonga, prompting a tsunami advisory for California, Oregon, Washington and Hawaii.

Authorities in Southern California closed beaches and piers as a precaution. The Hunga Tonga Hunga Ha’apai volcano is located about 40 miles north of Tonga's capital.

People on land, meanwhile, should “get off and away from the beach,” the weather agency said. The NWS offered tips for ...

A massive underwater volcano located approximately 300 miles off the coast of Oregon is on the verge of erupting, scientists say, and for the first time, the public can witness it live ...

Despite being rare, tsunamis represent one of the most powerful and unpredictable natural forces affecting the United States.