Japan Median Tectonic Line

Japan Median Tectonic Line
Red line represents Median Tectonic Line

Japan Median Tectonic Line (中央構造線 Chūō Kōzō Sen?), also Median Tectonic Line (MTL), is Japan's longest fault system. It connects with the Itoigawa-Shizuoka Tectonic Line (ISTL), the left blue line on the map, and the Fossa Magna, the pink shaded region.

The MTL begins near Ibaraki Prefecture, runs through central Honshū to near Nagoya, passing through Mikawa Bay, then through the Inland Sea from the Kii Channel and Naruto Strait to Shikoku along the Sadamisaki Peninsula and the Bungo Channel and Hōyo Strait to Kyūshū.