A 6.1-magnitude earthquake struck off the coast of northern Japan on Thursday, the Meteorological Agency said. There were no immediate reports of damage or casualties. The quake hit Thursday morning off the coast of Miyagi, about 180 miles (290 kilometers) north of Tokyo, the agency said. It struck at a depth of about six miles (10 kilometers). The agency said there was no danger of a tsunami from the earthquake. Masakazu Murakami, an official in charge of disaster management in Miyagi, said the quake caused no damage to utilities such as water, electricity, gas and telephone lines.