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 [...]
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