Two moderate earthquakes rattled the Indonesian island of Nias on Saturday, the meteorological agency said. There were no immediate reports of casualties or damage. A 5.0-magnitude quake struck at 5:47 a.m. and was centered 30 kilometers beneath the ocean floor and 63 kilometers northwest of Nias' capital, Gunungsitoli, said Andriana, an official at the agency who goes by only one name. Twelve hours earlier, an underwater quake of the same magnitude hit the region. That temblor was centered 30 kilometers beneath the ocean floor and 37 kilometers southwest of Gunungsitoli. Neither earthquake triggered panic on the island, which has been hit by four tremors in the last three days, Andriana said.