On Santorini, a deposit of white tephra thrown from the eruption is found lying up to thick, overlying the soil marking the ground level before the eruption, and forming a layer divided into three fairly distinct bands indicating different phases of the eruption. Archaeological discoveries in 2006 by a team of international scientists revealed that the Santorini event was much more massive than previously thought; it expelled of magma and rock into the Earth's atmosphere, compared to previous estimates of only in 1991, producing an estimated of tephra. Only the Mount Tambora volcanic eruption of 1815, the 181 AD eruption of Lake Taupo, and possibly Baekdu Mountain's 946 AD eruption have released more material into the atmosphere during the past 5,000 years.