2026-09-20T20:00:00Z 通常 気象庁本庁 気象庁 2026-09-21T05:00:00+09:00 2026-09-21T06:00:00+09:00 2026-09-22T00:00:00+09:00 509 発表 1 降灰予報 1.1_0 　現在、口永良部島は噴火警戒レベル２（火口周辺規制）です。口永良部島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方向、２１日２１時から２４時までは火口から南方向に降灰が予想されます。 降灰予報（定時） 06 口永良部島 509 降灰 70 鹿児島県屋久島町 4650500 小さな噴石の落下 75 鹿児島県屋久島町 4650500 降灰予報（定時） 06 口永良部島 509 +3026.60+13013.03+657/ 降灰 70 鹿児島県屋久島町 4650500 小さな噴石の落下 75 鹿児島県屋久島町 4650500 2026-09-21T06:00:00+09:00 2026-09-21T09:00:00+09:00 降灰 70 +30.4592+130.2000/+30.4599+130.2200/+30.4543+130.2400/+30.4400+130.2543/+30.4200+130.2596/+30.4000+130.2598/+30.3800+130.2598/+30.3680+130.2600/+30.3600+130.2676/+30.3400+130.2767/+30.3200+130.2783/+30.3000+130.2788/+30.2800+130.2796/+30.2746+130.2800/+30.2600+130.2897/+30.2400+130.2946/+30.2200+130.2974/+30.2000+130.2994/+30.1980+130.3000/+30.1800+130.3164/+30.1631+130.3200/+30.1600+130.3215/+30.1400+130.3276/+30.1200+130.3311/+30.1000+130.3346/+30.0891+130.3400/+30.0800+130.3471/+30.0600+130.3501/+30.0400+130.3534/+30.0200+130.3600/+30.0000+130.3752/+29.9800+130.3788/+29.9739+130.3800/+29.9600+130.3828/+29.9400+130.3862/+29.9200+130.3902/+29.9000+130.3978/+29.8934+130.4000/+29.8800+130.4038/+29.8600+130.4096/+29.8400+130.4124/+29.8200+130.4122/+29.8000+130.4118/+29.7893+130.4000/+29.8000+130.3923/+29.8200+130.3819/+29.8223+130.3800/+29.8362+130.3600/+29.8400+130.3560/+29.8548+130.3400/+29.8600+130.3370/+29.8800+130.3258/+29.8914+130.3200/+29.9000+130.3158/+29.9200+130.3002/+29.9202+130.3000/+29.9400+130.2864/+29.9504+130.2800/+29.9600+130.2753/+29.9800+130.2662/+29.9948+130.2600/+30.0000+130.2581/+30.0200+130.2517/+30.0400+130.2470/+30.0600+130.2403/+30.0611+130.2400/+30.0800+130.2290/+30.1000+130.2276/+30.1200+130.2244/+30.1400+130.2207/+30.1435+130.2200/+30.1600+130.2108/+30.1800+130.2131/+30.2000+130.2079/+30.2200+130.2048/+30.2400+130.2027/+30.2600+130.2016/+30.2800+130.2010/+30.3000+130.2004/+30.3176+130.2000/+30.3200+130.1990/+30.3400+130.1910/+30.3600+130.1874/+30.3800+130.1841/+30.4000+130.1819/+30.4200+130.1807/+30.4400+130.1808/+30.4592+130.2000/ 南 70 鹿児島県屋久島町 4650500 小さな噴石の落下 75 1 +30.4588+130.2200/+30.4400+130.2388/+30.4200+130.2335/+30.4037+130.2200/+30.4200+130.2065/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-21T09:00:00+09:00 2026-09-21T12:00:00+09:00 降灰 70 +30.4592+130.2000/+30.4600+130.2200/+30.4578+130.2400/+30.4400+130.2578/+30.4200+130.2598/+30.4000+130.2599/+30.3800+130.2599/+30.3741+130.2600/+30.3600+130.2731/+30.3400+130.2779/+30.3200+130.2787/+30.3000+130.2791/+30.2800+130.2800/+30.2600+130.2914/+30.2400+130.2955/+30.2200+130.2972/+30.2000+130.2990/+30.1965+130.3000/+30.1800+130.3137/+30.1600+130.3180/+30.1516+130.3200/+30.1400+130.3240/+30.1200+130.3284/+30.1000+130.3317/+30.0829+130.3400/+30.0800+130.3422/+30.0600+130.3447/+30.0400+130.3473/+30.0200+130.3513/+30.0015+130.3600/+30.0000+130.3610/+29.9800+130.3661/+29.9600+130.3710/+29.9400+130.3735/+29.9200+130.3737/+29.9000+130.3741/+29.8800+130.3716/+29.8600+130.3646/+29.8555+130.3600/+29.8600+130.3550/+29.8696+130.3400/+29.8800+130.3343/+29.9000+130.3220/+29.9025+130.3200/+29.9200+130.3001/+29.9201+130.3000/+29.9400+130.2876/+29.9563+130.2800/+29.9600+130.2784/+29.9800+130.2698/+29.9979+130.2600/+30.0000+130.2591/+30.0200+130.2509/+30.0400+130.2445/+30.0507+130.2400/+30.0600+130.2340/+30.0800+130.2256/+30.1000+130.2254/+30.1200+130.2216/+30.1281+130.2200/+30.1400+130.2141/+30.1600+130.2065/+30.1800+130.2091/+30.2000+130.2057/+30.2200+130.2038/+30.2400+130.2026/+30.2600+130.2017/+30.2800+130.2009/+30.3000+130.2005/+30.3200+130.2002/+30.3303+130.2000/+30.3400+130.1965/+30.3600+130.1917/+30.3800+130.1872/+30.4000+130.1834/+30.4200+130.1811/+30.4400+130.1808/+30.4592+130.2000/ 南 70 鹿児島県屋久島町 4650500 小さな噴石の落下 75 1 +30.4588+130.2200/+30.4400+130.2388/+30.4200+130.2315/+30.4060+130.2200/+30.4200+130.2085/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-21T12:00:00+09:00 2026-09-21T15:00:00+09:00 降灰 70 +30.4557+130.2000/+30.4600+130.2200/+30.4596+130.2400/+30.4400+130.2596/+30.4200+130.2599/+30.4179+130.2600/+30.4000+130.2779/+30.3800+130.2797/+30.3680+130.2800/+30.3600+130.2880/+30.3400+130.2984/+30.3200+130.2995/+30.3129+130.3000/+30.3000+130.3115/+30.2800+130.3174/+30.2600+130.3195/+30.2567+130.3200/+30.2400+130.3332/+30.2200+130.3380/+30.2076+130.3400/+30.2000+130.3527/+30.1916+130.3600/+30.1800+130.3649/+30.1600+130.3729/+30.1400+130.3789/+30.1371+130.3800/+30.1200+130.3894/+30.1000+130.3979/+30.0942+130.4000/+30.0800+130.4115/+30.0655+130.4200/+30.0600+130.4223/+30.0400+130.4286/+30.0200+130.4384/+30.0152+130.4400/+30.0000+130.4475/+29.9800+130.4576/+29.9765+130.4600/+29.9600+130.4688/+29.9400+130.4748/+29.9200+130.4797/+29.9190+130.4800/+29.9000+130.4895/+29.8800+130.4859/+29.8754+130.4800/+29.8727+130.4600/+29.8800+130.4466/+29.8830+130.4400/+29.9000+130.4277/+29.9122+130.4200/+29.9200+130.4127/+29.9290+130.4000/+29.9400+130.3906/+29.9556+130.3800/+29.9600+130.3775/+29.9800+130.3654/+29.9902+130.3600/+30.0000+130.3538/+30.0140+130.3400/+30.0200+130.3369/+30.0400+130.3293/+30.0600+130.3204/+30.0610+130.3200/+30.0800+130.3060/+30.0989+130.3000/+30.1000+130.2997/+30.1200+130.2903/+30.1400+130.2831/+30.1525+130.2800/+30.1600+130.2735/+30.1800+130.2728/+30.2000+130.2648/+30.2200+130.2613/+30.2279+130.2600/+30.2400+130.2518/+30.2600+130.2443/+30.2800+130.2413/+30.2917+130.2400/+30.3000+130.2333/+30.3200+130.2233/+30.3400+130.2208/+30.3600+130.2200/+30.3603+130.2200/+30.3800+130.2015/+30.4000+130.2001/+30.4200+130.2000/+30.4235+130.2000/+30.4400+130.1844/+30.4557+130.2000/ +29.8662+130.5000/+29.8600+130.5018/+29.8498+130.5000/+29.8600+130.4951/+29.8662+130.5000/ 南 70 鹿児島県屋久島町 4650500 小さな噴石の落下 75 1 +30.4588+130.2200/+30.4400+130.2388/+30.4200+130.2371/+30.4066+130.2200/+30.4200+130.2090/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-21T15:00:00+09:00 2026-09-21T18:00:00+09:00 降灰 70 +30.4566+130.2000/+30.4600+130.2200/+30.4597+130.2400/+30.4400+130.2597/+30.4200+130.2600/+30.4191+130.2600/+30.4000+130.2790/+30.3800+130.2798/+30.3774+130.2800/+30.3600+130.2970/+30.3400+130.2994/+30.3302+130.3000/+30.3200+130.3098/+30.3000+130.3181/+30.2800+130.3196/+30.2777+130.3200/+30.2600+130.3346/+30.2400+130.3390/+30.2359+130.3400/+30.2200+130.3529/+30.2113+130.3600/+30.2000+130.3726/+30.1800+130.3774/+30.1737+130.3800/+30.1600+130.3887/+30.1400+130.3958/+30.1310+130.4000/+30.1200+130.4150/+30.1128+130.4200/+30.1000+130.4268/+30.0800+130.4338/+30.0664+130.4400/+30.0600+130.4470/+30.0400+130.4596/+30.0388+130.4600/+30.0200+130.4708/+30.0009+130.4800/+30.0000+130.4804/+29.9800+130.4841/+29.9600+130.4982/+29.9575+130.5000/+29.9400+130.5064/+29.9200+130.5026/+29.9136+130.5000/+29.9200+130.4971/+29.9332+130.4800/+29.9373+130.4600/+29.9400+130.4555/+29.9497+130.4400/+29.9600+130.4315/+29.9715+130.4200/+29.9800+130.4089/+29.9856+130.4000/+30.0000+130.3874/+30.0088+130.3800/+30.0200+130.3743/+30.0400+130.3654/+30.0462+130.3600/+30.0600+130.3445/+30.0675+130.3400/+30.0800+130.3350/+30.1000+130.3267/+30.1114+130.3200/+30.1200+130.3150/+30.1400+130.3027/+30.1448+130.3000/+30.1600+130.2907/+30.1800+130.2858/+30.2000+130.2827/+30.2154+130.2800/+30.2200+130.2770/+30.2400+130.2644/+30.2600+130.2611/+30.2677+130.2600/+30.2800+130.2506/+30.3000+130.2421/+30.3200+130.2403/+30.3217+130.2400/+30.3400+130.2236/+30.3600+130.2205/+30.3678+130.2200/+30.3800+130.2079/+30.4000+130.2002/+30.4200+130.2000/+30.4228+130.2000/+30.4400+130.1836/+30.4566+130.2000/ 南 60 鹿児島県屋久島町 4650500 小さな噴石の落下 75 1 +30.4588+130.2200/+30.4400+130.2388/+30.4200+130.2344/+30.4096+130.2200/+30.4200+130.2112/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-21T18:00:00+09:00 2026-09-21T21:00:00+09:00 降灰 70 +30.4677+130.2200/+30.4600+130.2277/+30.4593+130.2400/+30.4400+130.2593/+30.4200+130.2599/+30.4000+130.2599/+30.3973+130.2600/+30.3800+130.2766/+30.3600+130.2790/+30.3400+130.2796/+30.3329+130.2800/+30.3200+130.2904/+30.3000+130.2966/+30.2800+130.2982/+30.2637+130.3000/+30.2600+130.3028/+30.2400+130.3120/+30.2200+130.3166/+30.2000+130.3193/+30.1981+130.3200/+30.1800+130.3331/+30.1600+130.3378/+30.1489+130.3400/+30.1400+130.3453/+30.1200+130.3529/+30.1000+130.3555/+30.0800+130.3585/+30.0712+130.3600/+30.0600+130.3636/+30.0400+130.3696/+30.0200+130.3693/+30.0000+130.3608/+29.9972+130.3600/+29.9948+130.3400/+30.0000+130.3370/+30.0066+130.3200/+30.0200+130.3030/+30.0238+130.3000/+30.0400+130.2894/+30.0530+130.2800/+30.0600+130.2750/+30.0800+130.2654/+30.1000+130.2616/+30.1049+130.2600/+30.1200+130.2539/+30.1400+130.2456/+30.1600+130.2404/+30.1800+130.2423/+30.2000+130.2412/+30.2058+130.2400/+30.2200+130.2326/+30.2400+130.2261/+30.2600+130.2231/+30.2800+130.2209/+30.3000+130.2201/+30.3023+130.2200/+30.3200+130.2108/+30.3400+130.2046/+30.3600+130.2013/+30.3800+130.2003/+30.4000+130.2001/+30.4065+130.2000/+30.4200+130.1866/+30.4400+130.1809/+30.4593+130.2000/+30.4600+130.2113/+30.4677+130.2200/ 南 50 鹿児島県屋久島町 4650500 小さな噴石の落下 75 1 +30.4588+130.2200/+30.4400+130.2388/+30.4200+130.2274/+30.4126+130.2200/+30.4200+130.2138/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-21T21:00:00+09:00 2026-09-22T00:00:00+09:00 降灰 70 +30.4760+130.2200/+30.4600+130.2360/+30.4584+130.2400/+30.4400+130.2584/+30.4200+130.2598/+30.4000+130.2598/+30.3800+130.2600/+30.3792+130.2600/+30.3600+130.2759/+30.3400+130.2785/+30.3200+130.2797/+30.3171+130.2800/+30.3000+130.2923/+30.2800+130.2962/+30.2600+130.2975/+30.2403+130.3000/+30.2400+130.3002/+30.2200+130.3117/+30.2000+130.3132/+30.1800+130.3180/+30.1600+130.3173/+30.1400+130.3156/+30.1200+130.3116/+30.1000+130.3011/+30.0984+130.3000/+30.0800+130.2813/+30.0785+130.2800/+30.0800+130.2645/+30.0802+130.2600/+30.0831+130.2400/+30.1000+130.2345/+30.1200+130.2233/+30.1400+130.2218/+30.1477+130.2200/+30.1600+130.2169/+30.1800+130.2136/+30.2000+130.2089/+30.2200+130.2079/+30.2400+130.2091/+30.2600+130.2071/+30.2800+130.2044/+30.3000+130.2030/+30.3200+130.2018/+30.3400+130.2009/+30.3600+130.2004/+30.3800+130.2001/+30.4000+130.2000/+30.4200+130.1813/+30.4400+130.1803/+30.4599+130.2000/+30.4600+130.2014/+30.4760+130.2200/ 南 40 鹿児島県屋久島町 4650500 小さな噴石の落下 75 1 +30.4588+130.2200/+30.4400+130.2388/+30.4202+130.2200/+30.4400+130.2012/+30.4588+130.2200/ 南東 1 鹿児島県屋久島町 4650500 　現在、口永良部島は噴火警戒レベル２（火口周辺規制）です。口永良部島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方向、２１日２１時から２４時までは火口から南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　南　　　　　　　７０ｋｍ　　３ｋｍ　　　　　 　２１日０９時から１２時まで　南　　　　　　　７０ｋｍ　　３ｋｍ　　　　　 　２１日１２時から１５時まで　南　　　　　　　７０ｋｍ　　３ｋｍ　　　　　 　２１日１５時から１８時まで　南　　　　　　　６０ｋｍ　　３ｋｍ　　　　　 　２１日１８時から２１時まで　南　　　　　　　５０ｋｍ　　３ｋｍ　　　　　 　２１日２１時から２４時まで　南　　　　　　　４０ｋｍ　　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。 　鹿児島県：屋久島町 　 　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。