Dozens of flights were cancelled in the Japanese town of Kumamoto after the eruption of Mount Aso volcano, at 1000 km southwets of Tokyo on Kyushu island. The crater spewed out lava and debris, while columns of ash rose to 1 km, stretching as far as to blanket two near-by cities. However, according to the Japan Meteorological Agency the activity should not increase further. Aso is the largest active...