Nnyocha ndị mbụ e mere na 1946 gosiri na ọwụwa anyanwụ nwere ihe ruru mita 200 (656 ụkwụ) miri emi na geology nke ugwu mgbawa. Ọdịda anyanwụ nwere oke omimi nke mita 140 (459 ụkwụ) na geology nke mejupụtara ọtụtụ nkume sedimentary nke oge Neogene. A họọrọ ọkpụkpụ ọdịda 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. Mmekọrịta mbụ dị n'etiti n'akụkụ abụọ ahụ mere na 1983. Mpaghara Tsugaru nwere ọwụwa anyanwụ na ọdịda anyanwụ, ihe dịka 20 km (12 mi) n'obosara. Nnyocha mbụ e mere na 1946 gosiri na ọwara ọwụwa anyanwụ ruru mita 200 (656 ụkwụ) miri emi na geology nke ugwu mgbawa.
Igneous intrusions na mmejọ