2026-08-20T17:00:00Z 通常 気象庁本庁 気象庁 2026-08-21T02:00:00+09:00 2026-08-21T03:00:00+09:00 2026-08-21T21:00:00+09:00 207 発表 1 降灰予報 1.1_0 　現在、岩手山は噴火警戒レベル２（火口周辺規制）です。岩手山で噴火が発生した場合には、２１日０９時から１２時までは火口から南東方向に降灰が予想されます。 降灰予報（定時） 06 岩手山 207 降灰 70 岩手県盛岡市 0320100 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 岩手県八幡平市 0321400 岩手県雫石町 0330100 降灰予報（定時） 06 岩手山 207 +3951.15+14100.07+2038/ 降灰 70 岩手県盛岡市 0320100 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 岩手県八幡平市 0321400 岩手県雫石町 0330100 2026-08-21T03:00:00+09:00 2026-08-21T06:00:00+09:00 降灰 70 +39.8798+140.9600/+39.8800+140.9800/+39.8798+141.0000/+39.8744+141.0200/+39.8600+141.0392/+39.8599+141.0400/+39.8594+141.0600/+39.8584+141.0800/+39.8502+141.1000/+39.8400+141.1131/+39.8303+141.1200/+39.8200+141.1301/+39.8000+141.1362/+39.7800+141.1320/+39.7704+141.1200/+39.7665+141.1000/+39.7600+141.0913/+39.7503+141.0800/+39.7451+141.0600/+39.7493+141.0400/+39.7537+141.0200/+39.7600+141.0111/+39.7771+141.0000/+39.7800+140.9987/+39.8000+140.9853/+39.8020+140.9800/+39.8200+140.9622/+39.8201+140.9600/+39.8400+140.9401/+39.8600+140.9402/+39.8798+140.9600/ 南東 10 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 1 +39.8788+140.9800/+39.8600+140.9991/+39.8400+140.9990/+39.8212+140.9800/+39.8400+140.9612/+39.8600+140.9612/+39.8788+140.9800/ 東 1 岩手県八幡平市 0321400 岩手県雫石町 0330100 2026-08-21T06:00:00+09:00 2026-08-21T09:00:00+09:00 降灰 70 +39.8799+140.9600/+39.8800+140.9800/+39.8797+141.0000/+39.8773+141.0200/+39.8689+141.0400/+39.8600+141.0553/+39.8591+141.0600/+39.8496+141.0800/+39.8400+141.0923/+39.8282+141.1000/+39.8200+141.1072/+39.8005+141.1200/+39.8000+141.1205/+39.7800+141.1288/+39.7600+141.1268/+39.7556+141.1200/+39.7527+141.1000/+39.7500+141.0800/+39.7502+141.0600/+39.7569+141.0400/+39.7600+141.0369/+39.7693+141.0200/+39.7800+141.0028/+39.7809+141.0000/+39.8000+140.9807/+39.8002+140.9800/+39.8200+140.9612/+39.8200+140.9600/+39.8400+140.9401/+39.8600+140.9401/+39.8799+140.9600/ 南東 20 岩手県盛岡市 0320100 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 1 +39.8788+140.9800/+39.8600+140.9990/+39.8400+140.9990/+39.8212+140.9800/+39.8400+140.9611/+39.8600+140.9609/+39.8788+140.9800/ 東 1 岩手県八幡平市 0321400 岩手県雫石町 0330100 2026-08-21T09:00:00+09:00 2026-08-21T12:00:00+09:00 降灰 70 +39.8952+140.9400/+39.8961+140.9600/+39.8860+140.9800/+39.8800+140.9874/+39.8793+141.0000/+39.8603+141.0200/+39.8600+141.0203/+39.8542+141.0400/+39.8400+141.0598/+39.8399+141.0600/+39.8200+141.0791/+39.8173+141.0800/+39.8000+141.0979/+39.7949+141.1000/+39.7800+141.1099/+39.7600+141.1079/+39.7472+141.1000/+39.7400+141.0959/+39.7294+141.0800/+39.7359+141.0600/+39.7400+141.0493/+39.7419+141.0400/+39.7505+141.0200/+39.7600+141.0140/+39.7705+141.0000/+39.7800+140.9898/+39.7880+140.9800/+39.8000+140.9693/+39.8034+140.9600/+39.8200+140.9404/+39.8202+140.9400/+39.8393+140.9200/+39.8400+140.9192/+39.8600+140.9106/+39.8771+140.9200/+39.8800+140.9208/+39.8952+140.9400/ 南東 20 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 1 +39.8654+140.9600/+39.8789+140.9800/+39.8600+140.9989/+39.8400+140.9989/+39.8211+140.9800/+39.8339+140.9600/+39.8400+140.9539/+39.8600+140.9546/+39.8654+140.9600/ 南西 2 岩手県八幡平市 0321400 岩手県雫石町 0330100 2026-08-21T12:00:00+09:00 2026-08-21T15:00:00+09:00 降灰 70 +39.8772+140.9400/+39.8800+140.9600/+39.8800+140.9800/+39.8752+141.0000/+39.8600+141.0176/+39.8591+141.0200/+39.8521+141.0400/+39.8400+141.0556/+39.8380+141.0600/+39.8327+141.0800/+39.8200+141.0955/+39.8100+141.1000/+39.8000+141.1106/+39.7879+141.1000/+39.7843+141.0800/+39.7855+141.0600/+39.7800+141.0471/+39.7720+141.0400/+39.7714+141.0200/+39.7716+141.0000/+39.7790+140.9800/+39.7800+140.9766/+39.7830+140.9600/+39.7997+140.9400/+39.8000+140.9398/+39.8200+140.9203/+39.8223+140.9200/+39.8400+140.9103/+39.8531+140.9200/+39.8600+140.9214/+39.8772+140.9400/ 南東 10 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 1 +39.8758+140.9600/+39.8788+140.9800/+39.8600+140.9989/+39.8400+140.9988/+39.8212+140.9800/+39.8327+140.9600/+39.8400+140.9527/+39.8600+140.9441/+39.8758+140.9600/ 南西 2 岩手県八幡平市 0321400 岩手県雫石町 0330100 2026-08-21T15:00:00+09:00 2026-08-21T18:00:00+09:00 降灰 70 +39.8800+140.9600/+39.8800+140.9800/+39.8631+141.0000/+39.8600+141.0032/+39.8543+141.0200/+39.8400+141.0367/+39.8371+141.0400/+39.8200+141.0576/+39.8000+141.0597/+39.7982+141.0600/+39.7800+141.0706/+39.7727+141.0600/+39.7633+141.0400/+39.7640+141.0200/+39.7716+141.0000/+39.7800+140.9808/+39.7801+140.9800/+39.7844+140.9600/+39.8000+140.9448/+39.8143+140.9400/+39.8200+140.9349/+39.8400+140.9315/+39.8499+140.9400/+39.8600+140.9400/+39.8800+140.9600/ 南東 10 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 1 +39.8788+140.9800/+39.8600+140.9989/+39.8400+140.9988/+39.8212+140.9800/+39.8400+140.9606/+39.8600+140.9608/+39.8788+140.9800/ 東 1 岩手県八幡平市 0321400 岩手県雫石町 0330100 2026-08-21T18:00:00+09:00 2026-08-21T21:00:00+09:00 降灰 70 +39.8799+140.9600/+39.8800+140.9800/+39.8607+141.0000/+39.8600+141.0008/+39.8400+141.0198/+39.8384+141.0200/+39.8200+141.0359/+39.8000+141.0339/+39.7800+141.0309/+39.7626+141.0200/+39.7600+141.0194/+39.7411+141.0000/+39.7400+140.9981/+39.7209+140.9800/+39.7200+140.9793/+39.7000+140.9688/+39.6800+140.9614/+39.6784+140.9600/+39.6707+140.9400/+39.6714+140.9200/+39.6704+140.9000/+39.6800+140.8918/+39.7000+140.8829/+39.7093+140.8800/+39.7200+140.8760/+39.7334+140.8800/+39.7400+140.8811/+39.7553+140.9000/+39.7600+140.9030/+39.7771+140.9200/+39.7800+140.9215/+39.8000+140.9393/+39.8009+140.9400/+39.8200+140.9401/+39.8400+140.9400/+39.8600+140.9401/+39.8799+140.9600/ 南 20 岩手県八幡平市 0321400 岩手県滝沢市 0321600 岩手県雫石町 0330100 小さな噴石の落下 75 1 +39.8788+140.9800/+39.8600+140.9988/+39.8400+140.9989/+39.8211+140.9800/+39.8400+140.9604/+39.8600+140.9612/+39.8788+140.9800/ 東 1 岩手県八幡平市 0321400 岩手県雫石町 0330100 　現在、岩手山は噴火警戒レベル２（火口周辺規制）です。岩手山で噴火が発生した場合には、２１日０９時から１２時までは火口から南東方向に降灰が予想されます。 　２１日３時から２１日２１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０３時から０６時まで　南東　　　　　　１０ｋｍ　　１ｋｍ　　　　　 　２１日０６時から０９時まで　南東　　　　　　２０ｋｍ　　１ｋｍ　　　　　 　２１日０９時から１２時まで　南東　　　　　　２０ｋｍ　　２ｋｍ　　　　　 　２１日１２時から１５時まで　南東　　　　　　１０ｋｍ　　２ｋｍ　　　　　 　２１日１５時から１８時まで　南東　　　　　　１０ｋｍ　　１ｋｍ　　　　　 　２１日１８時から２１時まで　南　　　　　　　２０ｋｍ　　１ｋｍ　　　　　 　 　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。 　岩手県　：八幡平市、雫石町、滝沢市、盛岡市 　 　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。