▁ 1 8 8 4 , ▁a ▁survey or ▁named ▁Charles ▁Clay ton ▁described ▁the ▁top ▁of ▁W ah anga ▁d ome ▁as ▁vol can ic ▁with ▁several ▁de press ions , ▁one ▁being ▁approximately ▁. ▁ ▁L oss ▁ ▁On ▁ 1 0 ▁June ▁ 1 8 8 6 , ▁Mount ▁T ara wer a ▁er upt ed . ▁The ▁er u ption ▁spread ▁from ▁west ▁of ▁W ah anga ▁d ome , ▁ ▁to ▁the ▁north , ▁down ▁to ▁Lake ▁Rot om ah ana . ▁The ▁vol cano ▁bel ched ▁out ▁hot ▁mud , ▁red ▁hot ▁b ould ers , ▁and ▁immense ▁clouds ▁of ▁black ▁ash ▁from ▁a ▁ ▁r ift ▁that ▁crossed ▁the ▁mountain , ▁passed ▁through ▁the ▁lake , ▁and ▁extended ▁beyond ▁into ▁the ▁Wa im angu ▁valley . ▁ ▁After ▁the ▁er u ption , ▁a ▁cr ater ▁over ▁ ▁in ▁depth ▁en comp ass ed ▁the ▁former ▁site ▁of ▁the ▁terra ces . ▁After ▁some ▁years ▁this ▁filled ▁with ▁water ▁to ▁form ▁a ▁new ▁Lake ▁Rot om ah ana , ▁ ▁higher , ▁ten ▁times ▁larger ▁and ▁deeper ▁than ▁the ▁old ▁lake . ▁ ▁Alfred ▁P atch et ▁War br ick , ▁a ▁boat ▁builder ▁at ▁Te ▁W airo a , ▁witness ed ▁the ▁er u ption ▁of ▁Mount ▁T ara wer a ▁from ▁Ma ung a ▁Mak at iti ▁to ▁the ▁north ▁of ▁Lake ▁T ara wer a . ▁War br ick ▁soon ▁had ▁wh ale bo ats ▁on ▁Lake ▁T ara wer a ▁investig ating