Smoke rises from Mount Aso, an active volcano, near the city of Aso in Kumamoto prefecture on December 13, 2019. Mount Aso's huge caldera dominates the southwestern main island of Kyushu, where the 1,592-metre volcano is a popular tourist spot. (Photo/Agencies)
Smoke rises from Mount Aso, an active volcano, near the city of Aso in Kumamoto prefecture on December 13, 2019. Mount Aso's huge caldera dominates the southwestern main island of Kyushu, where the 1,592-metre volcano is a popular tourist spot. (Photo/Agencies)
Smoke rises from Mount Aso, an active volcano, near the city of Aso in Kumamoto prefecture on December 13, 2019. Mount Aso's huge caldera dominates the southwestern main island of Kyushu, where the 1,592-metre volcano is a popular tourist spot. (Photo/Agencies)