They were being cautious,” said Amy Williamson, a research scientist at the UC Berkeley Seismology Lab. “They would rather ...

A tsunami alert has been issued for North California in the wake of a massive earthquake striking just off the US west coast.

Tsunami warnings are not uncommon in Califoria, where warning sirens and signs are in place to notify coastal residents that ...

It was felt as far south as San Francisco, where residents felt a rolling motion for several seconds. It was followed by ...

How rare are Tsunami warnings in the mainland United States? Tsunami warnings are far more common in areas of central America and Asia, although the United States and its territories do sometimes ...

In response to the quake, a tsunami warning was issued for certain areas ... an area known for its tectonic activity where the Pacific, North America, and Juan de Fuca/Gorda plates converge.

That information also goes to America’s two NOAA tsunami warning centers, in Alaska and Honolulu. Officials there have computer models that help predict tsunami risk. Earthquakes on subduction ...

That same earthquake must have caused at least some waves in Colonial America, according to the Pacific Tsunami Warning Center, though none were recorded. A model of the quake and subsequent ...