▁mud slide ▁events , ▁often ▁due ▁to ▁other ▁natural ▁dis aster s . ▁ ▁Mount ▁Ont ake ▁ ▁On ▁September ▁ 1 4 , ▁ 1 9 8 4 , ▁the   O t aki   ear th qu ake ▁( m agn itude ▁ 6 . 8 ) ▁in   N ag ano ▁Pref ect ure , ▁Japan , ▁caused ▁a ▁major ▁mud slide ▁on ▁the ▁south ▁face ▁of   Mount ▁Ont ake , ▁which ▁reached ▁spe eds ▁of ▁ 8 0 ~ 1 0 0   km / h .   He avy ▁rain ▁over ▁several ▁days ▁prior ▁to ▁the ▁qu ake ▁contributed ▁to ▁causing ▁the ▁mud slide , ▁known ▁as ▁“ O nt ake ▁K uz ure ,” ▁which ▁took ▁the ▁lives ▁of ▁ 2 9 ▁people . ▁After ▁the ▁dis aster , ▁bar riers ▁against ▁mud slide ▁were ▁ere cted ▁in ▁nine ▁locations ▁at ▁the ▁foot ▁of ▁M t . ▁Ont ake . ▁ ▁W ak ay ama ▁& ▁N ara ▁ ▁In ▁September ▁ 2 0 1 1 , ▁Trop ical ▁Storm ▁Tal as ▁( 2 0 1 1 ), ▁which ▁formed ▁and ▁was ▁named ▁on ▁August ▁ 2 5 , ▁made ▁land fall ▁over ▁Japan , ▁bringing ▁heavy ▁rain ▁to ▁the ▁mountain ous ▁K ii ▁Pen ins ula , ▁and ▁causing ▁a ▁mud slide , ▁called ▁“ Sh in so h ok ai ,” ▁in ▁W ak ay ama ▁and ▁N ara . ▁" Sh in so h ok ai " ▁means ▁that ▁not ▁only ▁soil ▁col