A mild earthquake with a preliminary magnitude of 5.2 shook a remote island southeast of Tokyo on Friday, the Meteorological Agency said. There was no danger of a tsunami, it said. The quake, which struck at 5:22 a.m. Friday was centered 60 kilometers underground near the remote island of Chichijima, about 970 kilometers southeast of Tokyo. There were no immediate reports of damages or injuries. Japan is one of the world's most earthquake-prone countries because it sits atop four tectonic plates.