Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: An fara binciken a 1946, kuma ginin ya fara a 1971. Ya zuwa watan Agusta 1982, ƙasa da mita 700 na ramin ya rage a tono. Saduwa ta farko tsakanin bangarorin biyu ya kasance a cikin 1983. Tsugaru Strait yana da wuyan gabas da yamma, duka kusan kilomita 20 (12 mi). Binciken farko da aka gudanar a cikin 1946 ya nuna cewa wuyan gabas yana da zurfin mita 200 (ƙafa 656) tare da yanayin dutsen mai fitad da wuta. Yammacin wuyan yana da matsakaicin zurfin mita 140 (ƙafa 459) da kuma ilimin ƙasa wanda ya ƙunshi yawancin dutsen da ke cikin zamanin Neogene. An zaɓi wuyan yamma, tare da yanayin da aka yi la'akari da shi don yin rami. Geology na ɓangaren karkashin ruwa na ramin yana kunshe da dutsen volcanic, pyroclastic rock, da kuma dutsen dutsen Neogene. An ninka yankin zuwa kusan madaidaiciya syncline, wanda ke nufin cewa ƙaramin dutsen yana tsakiyar mashigar kuma an haɗu da ƙarshe. An raba shi kusan kashi uku, bangaren Honshū ya ƙunshi duwatsu masu aman wuta (andesite, basalt da sauransu); bangaren Hokkaido ya ƙunshi duwatsu masu ɗorewa (Tertiary period tuff, mudstone, da sauransu); kuma tsakiyar ɓangaren ya ƙunshi Kuromatsunai strata (Tertiary period sand-like mudstone). Magnetic intrusions da laifuka sun haifar da murkushe dutsen kuma sun rikitar da hanyoyin yin rami. Binciken farko na ƙasa ya faru daga 1946 zuwa 1963, wanda ya haɗa da hakowa a cikin tekun, binciken sonic, hakowa na karkashin ruwa, lura ta amfani da ƙaramar jirgin ruwa, da binciken girgizar ƙasa da magnetic. Don tabbatar da kyakkyawar fahimta, an gudanar da gwajin gwaji na kwance a kan layin sabis da manyan ramin. Ramin ya faru a lokaci guda daga ƙarshen arewa da kudancin. An magance sassan busassun ƙasa tare da fasahohin hako dutsen gargajiya, tare da babban rami guda ɗaya. Koyaya, don ɓangaren da ke ƙarƙashin teku mai tsawon kilomita 23.3, an haƙa ramuka uku tare da haɓaka diamita daidai da juna: ramin gwaji na farko, ramin sabis, kuma a ƙarshe babban ramin. An haɗa ramin sabis ɗin lokaci-lokaci zuwa babban...  Tambaya: Waɗanne abubuwa biyu ne suka sa aikin haƙa rami ya yi wuya?
Abubuwan da suka faru na Igneous da kuskure