The magnitude 7.5 earthquake near Sand Point, Alaska, generated a tsunami, Scott Langley with the National Tsunami Warning Center said Monday afternoon.Langley said the tsunami sent two waves, each measuring 4 feet, 3 inches high. But observers onshore reported the waves appeared to be 1.5 feet and 2 feet over high tide.The center is monitoring harbors in a 500-mile area along the Alaska coastline, he