Triplicate Staff

A tsunami advisory is in effect for the North Coast in the wake of a 7.7-magnitude earthquake that occurred Saturday night off the coast of British Columbia.

Major flooding is not expected for areas under a tsunami advisory, but strong currents or waves dangerous to people in or very near the water are possible, so people should stay away from shores, the West Coast and Alaska Tsunami Warning Center says. Currents may be hazardous to swimmers, boats and coastal structures, and the threat may persist for hours.

Along the west coast of North America, low levels of tsunami activity have been observed from Sitka, Alaska, to Crescent City.

So far the highest tsunami amplitude seen along the West Coast was in Crescent City at 1.3 feet. Tsunami amplitudes are measured relative to normal sea level, not wave height.

The advisory covers coastal areas from Mendocino County to Florence, Ore., and British Columbia.

Evacuations have taken place in Hawaii, where a higher tsunami was expected.

The earthquake was at 8:04 p.m. Saturday in the Queen Charlotte Islands, B.C., area.