Chuo Kozo-Sen is the fault line in geological term, dividing South Western Japan into the continental and pacific ocean side. It is the active fault line, which is the cause of the earthquake. The fault line stretches over the length of 1,000km across from Yashiro City in Kyushu, Matsuyama, Ikeda, Mino and Naruto in Shikoku, Kii peninsula, Ise bay, Tenryu River, Lake Suwa to even further Kanto mountainous region.
This fault line is openly viewed at the next to the Roadside Station Mino.