Whakaotihia te rerenga e whai ake nei: He roto nui, e kiia nei ko Roto Rangi, kei roto i te kohua i runga i te maunga. I hangaia te caldera e te VEI 7 "Millennium" te "Tianchi" te pakarutanga o te 946, i pakaru mai i te tephra. Koinei tētahi o ngā pakarutanga nui rawa atu, kaha rawa atu hoki i roto i ngā tau 5,000 kua hipa (i te taha o te pakarutanga o Minoan, te pakarutanga o Hatepe o Lake Taupo i te tau 180 AD, te
1257 te pakarutanga o Maunga Samalas e tata ana ki Maunga Rinjani me te 1815 te pakarutanga o Tambora).