Nnyocha ndị mbụ e mere na 1946 gosiri na ọwụwa anyanwụ nwere ihe ruru mita 200 (656 ụkwụ) omimi na geology ugwu mgbawa. Ọdịda anyanwụ nwere omimi kachasị nke mita 140 (459 ụkwụ) na geology nke mejupụtara ọtụtụ nkume sedimentary nke oge Neogene. A họọrọ ọwụwa anyanwụ, na ọnọdụ ya dị mma maka tunneling. Geology nke akụkụ ala nke ọwara ahụ gụnyere ugwu mgbawa, nkume pyroclastic, na nkume sedimentary nke oge ahụ. Ebe mbụ dị n'okpuru oghere Tsugaru nwere ọwụwa anyanwụ na ọdịda anyanwụ, nke abụọ dị ihe dị ka 20 km (12 mi). Nnyocha mbụ e mere na 1946 gosiri na ọwara ọwụwa anyanwụ ruru mita 200 (656 ụkwụ) omimi na geology ugwu mgbawa.
nkume kacha nta