Flights Cancelled Due to Volcanic Eruption in Japan According to the reports of the Japan Meteorological Agency Mount Aso blasted out lava debris along with plumes of ash shot into the sky up to a kilometer height. Mount Aso is one of the largest volcanoes of the world located about 1000 kilometers southwest of Tokyo on Kyushu Island. Although in the late August earthquakes and seismic activities were marked the increase in the scale of eruption was not expected by the observatory.