Tsugaru Strait yana da gabas da yammacin wuyansa, duka kimanin 20 km (12 mi) a fadin. Binciken farko da aka gudanar a 1946 ya nuna cewa wuyan gabas yana da zurfin mita 200 (656 feet) tare da geology na volcanic. Yammacin wuyansa yana da zurfin mita 140 (459 feet) kuma geology ya ƙunshi mafi yawan dutsen da ke cikin Neogene. An zaɓi wuyan yamma, tare da yanayin da ya dace da tunneling. Geology na ɓangaren da ke cikin rami ya ƙunshi dutsen volcanic, dutsen pyroclastic, dutsen dutsen dutsen da dutsen dutsen dutsen da ke cikin lokacin.
200 da yawa