(NEXSTAR) – A tsunami advisory has been issued for parts of Alaska, California, Oregon and Washington after an undersea volcano erupted in the Tonga Islands. The National Tsunami Warning Center, a ...

WELLINGTON, New Zealand — The tsunami threat around the Pacific from a huge undersea volcanic eruption has begun to recede, while the extent of damage to Tonga remains unclear. The eruption on ...

Aerial view of the devastated along the north eastern coast of Japan following a massive earthquake and tsunami March 25, 2011. The undersea, magnitude 9.0 “megathrust” earthquake—the worst in Japan’s ...

WELLINGTON, New Zealand (AP) — A powerful undersea earthquake has struck north of New Zealand, prompting tsunami warnings for several island nations. The U.S. Geological Agency says the magnitude 7.7 ...

Earthquakes can strike almost anywhere. They can strike on land, beneath cities, in remote mountains, and even deep beneath the ocean floor. When an earthquake happens underwater, it's called an ...