The most recent eruption ended in 1993. Most eruptions of Naka-dake are small to moderate in size. Most are simple explosions that produce ash or blocks. Aso has not produced lava flows in historic time. Only 8 eruptions have caused fatalities.
Most fatalities are tourists on the rim of the cone.
Note people sledding and skiing in the foreground. Photograph courtesy of and copyrighted by Paul J. Buklarewicz . Looking across Aso caldera. One of the numerous cones inside the caldera is in the foreground. Photograph courtesy of and copyrighted by Paul J. Buklarewicz.