A wave generated by a strong earthquake off Alaska isn’t strong enough to produce damaging effects. The Alaska Tsunami Warning Center says a tsunami warning issued after the quake has been canceled. The magnitude 7.5 quake struck about 60 miles west of Craig, Alaska. The police chief in Craig says houses shook, but there were no reports of injuries. The U.S. Geological Survey says the quake was followed by six aftershocks. The strongest registered a 5.1 and came nearly four hours after the initial quake.