Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Kuongorora kwakatanga muna 1946, uye kuvaka kwakatanga muna 1971. Pakazosvika August 1982, mamita asingasviki 700 omugwagwa akanga achiri kufanira kucherwa. Kubata kwokutanga pakati pemativi maviri aya kwakaitika muna 1983. Tsugaru Strait ine makona ekumabvazuva nekumadokero, ese ari maviri anenge makiromita makumi maviri (12 mamaira). Kuongorora kwokutanga kwakaitwa muna 1946 kwakaratidza kuti mutsipa wokumabvazuva waiva wakadzika kusvika pamamita 200 uye waiva nemakomo anoputika. Mutsipa wokumadokero wakanga une udzamu hukuru hwemamita 140 uye geology inoumbwa zvikurukuru nematombo emarara enguva yeNeogene. Mutsipa wokumadokero wakasarudzwa, nemamiriro ayo aifungidzirwa kuva akanaka pakuchera mugero. Geology yechikamu chepasi pegungwa chetunnel ine matombo anoputika, matombo epyroclastic, uye sedimentary rock yenguva yeNeogene. Nzvimbo yacho yakapetwa kuita syncline inenge yakatwasuka, izvo zvinoreva kuti dombo duku riri pakati penzvimbo yacho uye rakasangana pakupedzisira. Yakakamurwa zvakapetwa muzvikamu zvitatu, rutivi rweHonshu runoumbwa nematombo anoputika (andesite, basalt nezvimwewo); rutivi rweHokkaido runoumbwa nematombo emarara (Tertiary period tuff, mudstone, nezvimwewo); uye chikamu chepakati chinoumbwa neKuromatsunai strata (Tertiary period sand-like mudstone). Kupinda kwegneous uye zvikanganiso zvakakonzera kupwanya dombo uye kunetsa nzira dzekuchera migero. Ongororo yekutanga ye geological yakaitika kubva muna 1946 kusvika muna 1963, iyo yaisanganisira kuchera pasi pegungwa, kuongorora kwe sonic, kuchera kwepasi pemvura, kucherechedza uchishandisa mini-submarine, uye kuongorora kwenyika uye kwemagineti. Kuti vawane nzwisiso huru, kuchera kwakatwasuka kwakatangwa mumutsetse webasa uye migero mikuru. Kuchera mugero kwakaitika panguva imwe chete kubva kumugumo wokuchamhembe uye wokumaodzanyemba. Zvikamu zvenyika yakaoma zvakagadziriswa nemitoo yekugadzira migero yemakomo, ine mugero mukuru mumwe chete. Zvisinei, nokuda kwechikamu chemakiromita 23,3 chiri pasi pegungwa, maburi matatu akacherwa nehupamhi hunowedzera nenzira yakatevedzana: mugero wokutanga wokuedza, mugero webasa, uye pakupedzisira mugero mukuru. Mugero webasa racho waibatanidzwa nguva nenguva nomugwagwa mukuru...  Mubvunzo: Zviitiko zvipi zviviri zvakaita kuti basa rokuchera mugero rive rakaoma?
Kupinda kwegneous uye zvikanganiso