Japan raises Mount Aso volcano alert to level 3, citing tremors and gas

Mount Aso, a prominent volcano in Japan's Kumamoto prefecture, is now under a heightened alert level of 3, the Japan Meteorological Agency announced on August 14. This elevation on a five-point scale signifies a call for entry restrictions to the mountain.

The agency cited intensifying volcanic tremors observed since August 12 and a significant surge in volcanic gas emissions, which surpassed 2,000 tons daily based on an August 14 survey, as the primary reasons for the upgrade from level 2. Level 2 previously restricted access only around the crater.

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There is no clear data showing that the quake led to an increase in volcanic activity.

Officials emphasized that there is currently no concrete evidence to suggest a connection between the increased volcanic activity and the magnitude 7.1 earthquake that struck Kumamoto prefecture on July 28. "We will continue to carefully monitor the situation," an agency official stated during a press conference, reassuring the public about ongoing surveillance.

The warning indicates that a potential eruption could impact an area within approximately 2 kilometers of the first crater of Mount Nakadake, one of the five peaks comprising Mount Aso. Mount Nakadake is situated within the Aso Caldera, recognized as one of the world's largest volcanic calderas.

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We will continue to carefully monitor the situation.