Alaska Quake Shows Complexity Of Tsunami Warnings

LOS ANGELES (AP) — The powerful earthquake that struck beneath the Gulf of Alaska early Tuesday generated a tsunami, but before gauges could show that it was very small, warnings went out to a vast swath of the state and British Columbia, while a lower-level alert targeted the rest of the West Coast. The magnitude-7.9 earthquake set in motion complex analysis that eventually downgraded and called off all alerts in less than four hours, but the protocol for the initial warnings only considered magnitude and location, said David Hale, a lead decision maker at the National Tsunami Warning Center in Palmer, Alaska.

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