East of Broken Top , the Tumalo volcanic center , an area of andesitic and mafic scoria cones , features similarly rhyolitic and rhyodacitic lava deposits . The Tumalo volcano spread ignimbrites and plinian deposits in ground eruptions across the area ( Plinian eruptions are similar to the eruption of Vesuvius that destroyed Pompeii ) . These deposits spread from Tumalo to the town of Bend
eruption of Vesuvius that destroyed Pompeii
Eruption of Mount Vesuvius in 79
Broken Top