  In this paper I reconstruct the distribution of ash released from great
Tambora eruption in 1815. The reconstruction was developed by analyzing the
meaning of Poem of Bima Kingdom written in 1830. I also compared the effect of
Tambora eruption and the Kelud eruption February 13, 2014 to estimate the most
logical thickness of ash that has fallen in Bima district. I get a more logical
value for ash thickness in Bima district of around 60 cm, not 10 cm as widely
reported. I also propose the change of ash distribution. Until presently, it
was accepted that the ash thickness distribution satisfied asymmetry cone
distribution. However, I propose the ash distributed according to asymmetry
Gaussian function. Random simulation and fitting of the thickness data
extracted from isopach map showed that the asymmetry Gaussian distribution is
more acceptable. I obtained the total volume of ash released in Tambora
eruption was around 180 km3, greater of about 20% than the present accepted
value of 150 km3
