, ▁vol can ic ▁ash ▁began ▁to ▁fall ▁in ▁East ▁Java , ▁with ▁faint ▁det on ation ▁sounds ▁last ing ▁until ▁ 1 0 ▁April . ▁ ▁The ▁er u ptions ▁intens ified ▁at ▁about ▁ 7 : 0 0 ▁p . m . ▁on ▁the ▁same ▁day . ▁Three ▁columns ▁of ▁fl ame ▁rose ▁and ▁merged ▁as ▁the ▁mountain ▁became ▁a ▁flow ing ▁mass ▁of ▁liquid ▁fire . ▁Pie ces ▁of ▁p um ice ▁of ▁up ▁to ▁ ▁in ▁diameter ▁ra ined ▁down ▁at ▁approximately ▁ 8   p . m ., ▁followed ▁by ▁ash ▁at ▁around ▁ 9 – 1 0   p . m . ▁The ▁er u ption ▁column ▁col lapsed , ▁producing ▁hot ▁py ro cl astic ▁flows ▁that ▁cas c aded ▁down ▁the ▁mountain ▁and ▁towards ▁the ▁sea ▁on ▁all ▁sides ▁of ▁the ▁pen ins ula , ▁w ip ing ▁out ▁the ▁village ▁of ▁Tamb ora . ▁L oud ▁explos ions ▁were ▁heard ▁until ▁the ▁next ▁evening , ▁ 1 1 ▁April . ▁The ▁ve il ▁of ▁ash ▁spread ▁as ▁far ▁as ▁West ▁Java ▁and ▁South ▁Sul aw esi , ▁while ▁a ▁" nit r ous ▁od or " ▁was ▁notice able ▁in ▁Bat avia . ▁The ▁heavy ▁te ph ra - ting ed ▁rain ▁did ▁not ▁re ced e ▁until ▁ 1 7 ▁April . ▁Analysis ▁of ▁various ▁sites ▁on ▁Mount ▁Tamb ora ▁using ▁ground - pen etr ating ▁rad ar ▁has ▁revealed ▁altern ations ▁of ▁p um ice ▁and ▁ash ▁depos its ▁covered ▁by ▁the