A STRONG EARTHQUAKE rocked Alaska's Aleutian Islands Tuesday but caused no serious damage or injuries. The earthquake, measuring 6.0 on the Richter scale, had an epicenter on the ocean floor about 10 miles north of the island of Amchitka . . . A 68-YEAR-OLD MAN was found dead on a bus stop bench in Omaha, Neb., apparently after succumbing to hypothermia, officials said. Leonard Morris, who was believed to be homeless, lay down on a bus-stop bench sometime early Saturday, authorities said. Police received an anonymous call that morning and called an ambulance.