Abstract
Two recent supereruptions (magnitude (M) scale ≥ 8), the Young Toba Tuff
(YTT), Sumatra, and the Los Chocoyos (LCY), Guatemala, are found to be
statistically synchronous at ca. 74 ka and near antipodal. Such
planetwide synchroneity of supereruptions is shown to be statistically
non-random implying a causal link. We propose that the seismic energy
release from the YTT supereruption may have initiated eruption from the
contemporaneous “perched” LCY magma system. This near-equatorial
supereruption “double-whammy” may be the more compelling source of the
significant environmental impacts often attributed to a singular YTT
eruption.