2026-10-20T20:00:00Z 通常 気象庁本庁 気象庁 2026-10-21T05:00:00+09:00 2026-10-21T06:00:00+09:00 2026-10-22T00:00:00+09:00 503 発表 1 降灰予報 1.1_0 　現在、阿蘇山は噴火警戒レベル２（火口周辺規制）です。阿蘇山で噴火が発生した場合には、２１日０９時から１２時までは火口から北東方向、２１日２１時から２４時までは火口から南東方向に降灰が予想されます。 降灰予報（定時） 06 阿蘇山 503 降灰 70 熊本県阿蘇市 4321400 熊本県産山村 4342500 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 大分県大分市 4420100 大分県佐伯市 4420500 大分県臼杵市 4420600 大分県竹田市 4420800 大分県豊後大野市 4421200 宮崎県延岡市 4520300 宮崎県高千穂町 4544100 宮崎県日之影町 4544200 宮崎県五ヶ瀬町 4544300 小さな噴石の落下 75 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 降灰予報（定時） 06 阿蘇山 503 +3253.07+13106.23+1592/ 降灰 70 熊本県阿蘇市 4321400 熊本県産山村 4342500 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 大分県大分市 4420100 大分県佐伯市 4420500 大分県臼杵市 4420600 大分県竹田市 4420800 大分県豊後大野市 4421200 宮崎県延岡市 4520300 宮崎県高千穂町 4544100 宮崎県日之影町 4544200 宮崎県五ヶ瀬町 4544300 小さな噴石の落下 75 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 2026-10-21T06:00:00+09:00 2026-10-21T09:00:00+09:00 降灰 70 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北東 80 熊本県阿蘇市 4321400 熊本県産山村 4342500 熊本県高森町 4342800 熊本県南阿蘇村 4343300 大分県大分市 4420100 大分県臼杵市 4420600 大分県竹田市 4420800 大分県豊後大野市 4421200 小さな噴石の落下 75 1 +32.9164+131.1000/+32.9098+131.1200/+32.9000+131.1345/+32.8902+131.1200/+32.8800+131.1188/+32.8612+131.1000/+32.8612+131.0800/+32.8800+131.0612/+32.8988+131.0800/+32.9000+131.0836/+32.9164+131.1000/ 北東 4 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 2026-10-21T09:00:00+09:00 2026-10-21T12:00:00+09:00 降灰 70 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北東 70 熊本県阿蘇市 4321400 熊本県産山村 4342500 熊本県高森町 4342800 熊本県南阿蘇村 4343300 大分県大分市 4420100 大分県臼杵市 4420600 大分県竹田市 4420800 大分県豊後大野市 4421200 小さな噴石の落下 75 1 +32.9173+131.1000/+32.9105+131.1200/+32.9000+131.1350/+32.8903+131.1200/+32.8800+131.1188/+32.8612+131.1000/+32.8612+131.0800/+32.8800+131.0612/+32.8988+131.0800/+32.9000+131.0827/+32.9173+131.1000/ 北東 4 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 2026-10-21T12:00:00+09:00 2026-10-21T15:00:00+09:00 降灰 70 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東 60 熊本県阿蘇市 4321400 熊本県産山村 4342500 熊本県高森町 4342800 熊本県南阿蘇村 4343300 大分県大分市 4420100 大分県臼杵市 4420600 大分県竹田市 4420800 大分県豊後大野市 4421200 小さな噴石の落下 75 1 +32.9164+131.1000/+32.9096+131.1200/+32.9000+131.1344/+32.8800+131.1297/+32.8730+131.1200/+32.8612+131.1000/+32.8612+131.0800/+32.8800+131.0612/+32.8988+131.0800/+32.9000+131.0836/+32.9164+131.1000/ 東 4 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 2026-10-21T15:00:00+09:00 2026-10-21T18:00:00+09:00 降灰 70 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南東 40 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 大分県佐伯市 4420500 大分県竹田市 4420800 大分県豊後大野市 4421200 宮崎県延岡市 4520300 宮崎県高千穂町 4544100 宮崎県日之影町 4544200 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8988+131.1000/+32.8905+131.1200/+32.8800+131.1325/+32.8666+131.1200/+32.8608+131.1000/+32.8612+131.0800/+32.8800+131.0612/+32.8988+131.0800/ 東 3 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 2026-10-21T21:00:00+09:00 2026-10-22T00:00:00+09:00 降灰 70 +32.9182+131.0800/+32.9183+131.1000/+32.9000+131.1185/+32.8999+131.1200/+32.8967+131.1400/+32.8800+131.1569/+32.8795+131.1600/+32.8757+131.1800/+32.8600+131.1968/+32.8592+131.2000/+32.8568+131.2200/+32.8458+131.2400/+32.8400+131.2469/+32.8374+131.2600/+32.8334+131.2800/+32.8242+131.3000/+32.8200+131.3083/+32.8168+131.3200/+32.8030+131.3400/+32.8000+131.3442/+32.7902+131.3600/+32.7800+131.3761/+32.7773+131.3800/+32.7741+131.4000/+32.7727+131.4200/+32.7711+131.4400/+32.7695+131.4600/+32.7678+131.4800/+32.7600+131.4976/+32.7585+131.5000/+32.7400+131.5185/+32.7378+131.5200/+32.7200+131.5358/+32.7000+131.5310/+32.6800+131.5218/+32.6776+131.5200/+32.6600+131.5124/+32.6431+131.5000/+32.6400+131.4967/+32.6279+131.4800/+32.6274+131.4600/+32.6271+131.4400/+32.6385+131.4200/+32.6400+131.4181/+32.6458+131.4000/+32.6586+131.3800/+32.6600+131.3781/+32.6694+131.3600/+32.6794+131.3400/+32.6800+131.3390/+32.6900+131.3200/+32.7000+131.3125/+32.7082+131.3000/+32.7200+131.2859/+32.7226+131.2800/+32.7312+131.2600/+32.7400+131.2495/+32.7441+131.2400/+32.7600+131.2225/+32.7609+131.2200/+32.7683+131.2000/+32.7800+131.1878/+32.7822+131.1800/+32.7986+131.1600/+32.8000+131.1585/+32.8041+131.1400/+32.8200+131.1240/+32.8206+131.1200/+32.8400+131.1004/+32.8400+131.1000/+32.8416+131.0800/+32.8600+131.0616/+32.8800+131.0601/+32.9000+131.0618/+32.9182+131.0800/ 南東 50 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 宮崎県延岡市 4520300 宮崎県高千穂町 4544100 宮崎県日之影町 4544200 宮崎県五ヶ瀬町 4544300 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8988+131.1000/+32.8868+131.1200/+32.8800+131.1285/+32.8699+131.1200/+32.8605+131.1000/+32.8612+131.0800/+32.8800+131.0612/+32.8988+131.0800/ 東 3 熊本県阿蘇市 4321400 熊本県高森町 4342800 熊本県南阿蘇村 4343300 　現在、阿蘇山は噴火警戒レベル２（火口周辺規制）です。阿蘇山で噴火が発生した場合には、２１日０９時から１２時までは火口から北東方向、２１日２１時から２４時までは火口から南東方向に降灰が予想されます。 　２１日６時から２１日２４時までに噴火が発生した場合には、以下の方向・距離に降灰及び小さな噴石の落下が予想されます。 　 　時刻　　　　　　　　　　　　火口からの方向　降灰の距離　小さな噴石の距離 　２１日０６時から０９時まで　北東　　　　　　８０ｋｍ　　４ｋｍ　　　　　 　２１日０９時から１２時まで　北東　　　　　　７０ｋｍ　　４ｋｍ　　　　　 　２１日１２時から１５時まで　東　　　　　　　６０ｋｍ　　４ｋｍ　　　　　 　２１日１５時から１８時まで　東　　　　　　　５０ｋｍ　　４ｋｍ　　　　　 　２１日１８時から２１時まで　南東　　　　　　４０ｋｍ　　３ｋｍ　　　　　 　２１日２１時から２４時まで　南東　　　　　　５０ｋｍ　　３ｋｍ　　　　　 　 　期間中に噴火が発生した場合には、以下の市町村に降灰が予想されます。 　熊本県　：阿蘇市、産山村、高森町、南阿蘇村、山都町 　大分県　：大分市、臼杵市、竹田市、豊後大野市、佐伯市 　宮崎県　：高千穂町、日之影町、延岡市、五ヶ瀬町 　 　噴煙が火口縁上１０００ｍまで上がった場合の火山灰及び小さな噴石の落下範囲を示しています。 　噴火発生時、小さな噴石の落下が予想される範囲内では、屋内や頑丈な屋根の下などに移動してください。