Rubuta ci gaba don wannan sakin layi - Fashewar ta fitar da tephra kuma ta rushe dutsen a cikin wani caldera, wanda yanzu ya ƙunshi tafkin crater mai suna Lake Lake. Fashewar ta fara ne da ginshiƙan Plinian mai ƙarfi, kuma ya ƙare da manyan hanyoyin pyroclastic. Matsakaicin Plinian ashfall da co<unk>ignimbrite ashfall sun rufe kusan Tekun Japan da arewacin Japan. An kira wannan ash ash "Baegdusan-Tomakomai ash" (B-Tm). Wataƙila ya faru ne a lokacin sanyi a ƙarshen shekara ta 946 A.Z. Wannan shi ne daya daga cikin manyan fashewa da tashin hankali a cikin shekaru 5000 da suka gabata, tare da fashewar Minoan na Thera, fashewar Hatepe na Lake Taupo (kusan 180 AD), fashewar Dutsen Samalas na 1257
kusa da Dutsen Rinjani, da kuma fashewar Dutsen Tambora na 1815.