page_title: Japan Median Tectonic Line
section_title: Shikoku
hierarchical_section_title: Japan Median Tectonic Line / Regions / Shikoku
caption_attribution_description: English: Japan Median Tectonic Line in Shikoku, Japan. 日本語: 中央構造線の四国地方。
context_page_description: Japan Median Tectonic Line, also Median Tectonic Line, is Japan's longest fault system. The MTL begins near Ibaraki Prefecture, where it connects with the Itoigawa-Shizuoka Tectonic Line and the Fossa Magna. It runs parallel to Japan's volcanic arc, passing through central Honshū to near Nagoya, 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.
  The sense of motion on the MTL is right-lateral strike-slip, at a rate of about 5–10 mm/yr. This sense of motion is consistent with the direction of oblique convergence at the Nankai Trough. The rate of motion on the MTL is much less than the rate of convergence at the plate boundary, making it difficult to distinguish the motion on the MTL from interseismic elastic straining in GPS data.
context_section_description: After crossing the Hōyo Strait from Kyushu to Shikoku, the MTL passes north of the Sadamisaki Peninsula to land at Iyo on the west coast of Ehime Prefecture. It continues eastward past the city of Saijō and along the foothills of the Ishizuchi Range. From Miyoshi in Tokushima Prefecture it passes along the northern side of the Yoshino River until it arrives at the city of Tokushima on the east coast of the island. There are active shear zones to the north of the MTL: north of Iyo and, in eastern Shikoku, along the southern foothills of the Sanuki Mountains, at the northern border of Tokushima Prefecture.
caption: MTL on Shikoku Island
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