2026-09-19T23:00:00Z 通常 気象庁本庁 気象庁 2026-09-20T08:00:00+09:00 2026-09-20T09:00:00+09:00 2026-09-21T03:00:00+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、２０日０９時から１２時までは火口から南方向、２０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 2026-09-20T09:00:00+09:00 2026-09-20T12:00:00+09:00 降灰 70 +30.4690+130.2200/+30.4600+130.2290/+30.4400+130.2400/+30.4357+130.2400/+30.4200+130.2548/+30.4000+130.2569/+30.3800+130.2563/+30.3600+130.2541/+30.3400+130.2518/+30.3200+130.2455/+30.3000+130.2453/+30.2800+130.2440/+30.2600+130.2411/+30.2400+130.2439/+30.2200+130.2443/+30.2000+130.2430/+30.1800+130.2501/+30.1600+130.2553/+30.1400+130.2554/+30.1200+130.2553/+30.1000+130.2553/+30.0800+130.2598/+30.0600+130.2595/+30.0400+130.2592/+30.0200+130.2565/+30.0000+130.2523/+29.9800+130.2403/+29.9795+130.2400/+29.9600+130.2213/+29.9584+130.2200/+29.9400+130.2012/+29.9383+130.2000/+29.9400+130.1995/+29.9600+130.1904/+29.9800+130.1806/+29.9812+130.1800/+30.0000+130.1721/+30.0200+130.1673/+30.0400+130.1637/+30.0600+130.1605/+30.0639+130.1600/+30.0800+130.1571/+30.1000+130.1585/+30.1200+130.1561/+30.1400+130.1523/+30.1600+130.1498/+30.1800+130.1500/+30.2000+130.1557/+30.2200+130.1547/+30.2400+130.1521/+30.2600+130.1588/+30.2635+130.1600/+30.2800+130.1608/+30.3000+130.1617/+30.3200+130.1625/+30.3400+130.1635/+30.3600+130.1676/+30.3759+130.1800/+30.3800+130.1801/+30.4000+130.1801/+30.4200+130.1801/+30.4400+130.1801/+30.4599+130.2000/+30.4600+130.2089/+30.4690+130.2200/ 南 60 鹿児島県屋久島町 4650500 小さな噴石の落下 75 1 +30.4511+130.2000/+30.4588+130.2200/+30.4400+130.2388/+30.4200+130.2288/+30.4099+130.2200/+30.4123+130.2000/+30.4200+130.1943/+30.4400+130.1889/+30.4511+130.2000/ 南西 3 鹿児島県屋久島町 4650500 2026-09-20T12:00:00+09:00 2026-09-20T15:00:00+09:00 降灰 70 +30.4698+130.2200/+30.4600+130.2298/+30.4594+130.2400/+30.4400+130.2594/+30.4200+130.2599/+30.4000+130.2600/+30.3999+130.2600/+30.3800+130.2788/+30.3600+130.2795/+30.3418+130.2800/+30.3400+130.2817/+30.3200+130.2964/+30.3000+130.2985/+30.2800+130.2997/+30.2776+130.3000/+30.2600+130.3128/+30.2400+130.3165/+30.2200+130.3200/+30.2199+130.3200/+30.2000+130.3344/+30.1834+130.3400/+30.1800+130.3448/+30.1600+130.3594/+30.1586+130.3600/+30.1400+130.3699/+30.1200+130.3775/+30.1156+130.3800/+30.1000+130.3919/+30.0800+130.3995/+30.0788+130.4000/+30.0600+130.4149/+30.0516+130.4200/+30.0400+130.4260/+30.0200+130.4346/+30.0100+130.4400/+30.0000+130.4473/+29.9800+130.4534/+29.9690+130.4600/+29.9600+130.4636/+29.9400+130.4629/+29.9354+130.4600/+29.9326+130.4400/+29.9400+130.4308/+29.9499+130.4200/+29.9587+130.4000/+29.9600+130.3988/+29.9792+130.3800/+29.9800+130.3793/+30.0000+130.3641/+30.0020+130.3600/+30.0182+130.3400/+30.0200+130.3388/+30.0400+130.3276/+30.0527+130.3200/+30.0600+130.3126/+30.0800+130.3007/+30.0809+130.3000/+30.1000+130.2896/+30.1200+130.2811/+30.1226+130.2800/+30.1400+130.2680/+30.1556+130.2600/+30.1600+130.2576/+30.1689+130.2600/+30.1800+130.2608/+30.1835+130.2600/+30.2000+130.2514/+30.2200+130.2442/+30.2400+130.2405/+30.2424+130.2400/+30.2600+130.2295/+30.2800+130.2241/+30.3000+130.2207/+30.3116+130.2200/+30.3200+130.2164/+30.3400+130.2066/+30.3600+130.2022/+30.3800+130.2005/+30.4000+130.2001/+30.4069+130.2000/+30.4200+130.1870/+30.4400+130.1810/+30.4592+130.2000/+30.4600+130.2089/+30.4698+130.2200/ 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+130.2302/+30.4108+130.2200/+30.4200+130.2123/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-20T15:00:00+09:00 2026-09-20T18:00:00+09:00 降灰 70 +30.4588+130.2000/+30.4600+130.2200/+30.4593+130.2400/+30.4400+130.2593/+30.4200+130.2599/+30.4063+130.2600/+30.4000+130.2663/+30.3800+130.2791/+30.3600+130.2797/+30.3517+130.2800/+30.3400+130.2911/+30.3200+130.2979/+30.3000+130.2992/+30.2893+130.3000/+30.2800+130.3078/+30.2600+130.3160/+30.2400+130.3185/+30.2295+130.3200/+30.2200+130.3267/+30.2000+130.3358/+30.1871+130.3400/+30.1800+130.3491/+30.1611+130.3600/+30.1600+130.3607/+30.1400+130.3704/+30.1200+130.3777/+30.1151+130.3800/+30.1000+130.3897/+30.0800+130.3948/+30.0678+130.4000/+30.0600+130.4079/+30.0419+130.4200/+30.0400+130.4210/+30.0200+130.4302/+30.0012+130.4400/+30.0000+130.4409/+29.9800+130.4434/+29.9600+130.4489/+29.9400+130.4409/+29.9396+130.4400/+29.9400+130.4390/+29.9464+130.4200/+29.9480+130.4000/+29.9600+130.3893/+29.9712+130.3800/+29.9800+130.3729/+29.9970+130.3600/+30.0000+130.3577/+30.0138+130.3400/+30.0200+130.3359/+30.0400+130.3248/+30.0452+130.3200/+30.0600+130.3032/+30.0649+130.3000/+30.0800+130.2934/+30.1000+130.2880/+30.1200+130.2826/+30.1266+130.2800/+30.1400+130.2696/+30.1585+130.2600/+30.1600+130.2592/+30.1619+130.2600/+30.1800+130.2622/+30.1877+130.2600/+30.2000+130.2524/+30.2200+130.2457/+30.2400+130.2415/+30.2525+130.2400/+30.2600+130.2353/+30.2800+130.2257/+30.3000+130.2223/+30.3200+130.2208/+30.3400+130.2201/+30.3407+130.2200/+30.3600+130.2037/+30.3800+130.2005/+30.4000+130.2001/+30.4083+130.2000/+30.4200+130.1883/+30.4400+130.1813/+30.4588+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+130.2342/+30.4083+130.2200/+30.4200+130.2105/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-20T18:00:00+09:00 2026-09-20T21:00:00+09:00 降灰 70 +30.4589+130.2000/+30.4600+130.2200/+30.4588+130.2400/+30.4400+130.2588/+30.4200+130.2599/+30.4000+130.2599/+30.3972+130.2600/+30.3800+130.2770/+30.3600+130.2794/+30.3400+130.2797/+30.3327+130.2800/+30.3200+130.2914/+30.3000+130.2976/+30.2800+130.2989/+30.2652+130.3000/+30.2600+130.3044/+30.2400+130.3147/+30.2200+130.3175/+30.2000+130.3195/+30.1988+130.3200/+30.1800+130.3365/+30.1606+130.3400/+30.1600+130.3406/+30.1400+130.3527/+30.1200+130.3583/+30.1066+130.3600/+30.1000+130.3624/+30.0800+130.3730/+30.0600+130.3784/+30.0531+130.3800/+30.0400+130.3828/+30.0200+130.3884/+30.0000+130.3926/+29.9800+130.3965/+29.9694+130.4000/+29.9600+130.4035/+29.9400+130.4074/+29.9200+130.4084/+29.9000+130.4097/+29.8800+130.4031/+29.8733+130.4000/+29.8800+130.3940/+29.8926+130.3800/+29.9000+130.3696/+29.9038+130.3600/+29.9195+130.3400/+29.9200+130.3397/+29.9400+130.3288/+29.9600+130.3202/+29.9604+130.3200/+29.9800+130.3117/+30.0000+130.3011/+30.0013+130.3000/+30.0200+130.2920/+30.0400+130.2862/+30.0538+130.2800/+30.0600+130.2744/+30.0800+130.2637/+30.1000+130.2626/+30.1101+130.2600/+30.1200+130.2565/+30.1400+130.2489/+30.1600+130.2436/+30.1800+130.2459/+30.2000+130.2425/+30.2200+130.2407/+30.2260+130.2400/+30.2400+130.2320/+30.2600+130.2258/+30.2800+130.2226/+30.3000+130.2210/+30.3200+130.2202/+30.3253+130.2200/+30.3400+130.2087/+30.3600+130.2016/+30.3800+130.2003/+30.4000+130.2001/+30.4045+130.2000/+30.4200+130.1845/+30.4400+130.1811/+30.4589+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+130.2341/+30.4046+130.2200/+30.4200+130.2071/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-20T21:00:00+09:00 2026-09-21T00:00:00+09:00 降灰 70 +30.4585+130.2000/+30.4599+130.2200/+30.4580+130.2400/+30.4400+130.2580/+30.4200+130.2599/+30.4000+130.2599/+30.3804+130.2600/+30.3800+130.2604/+30.3600+130.2784/+30.3400+130.2794/+30.3200+130.2796/+30.3059+130.2800/+30.3000+130.2854/+30.2800+130.2959/+30.2600+130.2981/+30.2400+130.2991/+30.2282+130.3000/+30.2200+130.3059/+30.2000+130.3146/+30.1903+130.3200/+30.1800+130.3301/+30.1600+130.3338/+30.1400+130.3362/+30.1200+130.3385/+30.1126+130.3400/+30.1000+130.3489/+30.0800+130.3570/+30.0681+130.3600/+30.0600+130.3674/+30.0400+130.3779/+30.0340+130.3800/+30.0200+130.3848/+30.0000+130.3896/+29.9800+130.3952/+29.9695+130.4000/+29.9600+130.4072/+29.9400+130.4155/+29.9219+130.4200/+29.9200+130.4205/+29.9000+130.4251/+29.8800+130.4248/+29.8600+130.4243/+29.8405+130.4200/+29.8400+130.4198/+29.8210+130.4000/+29.8400+130.3878/+29.8538+130.3800/+29.8600+130.3764/+29.8800+130.3623/+29.8829+130.3600/+29.9000+130.3478/+29.9065+130.3400/+29.9200+130.3302/+29.9400+130.3205/+29.9412+130.3200/+29.9600+130.3124/+29.9800+130.3026/+29.9837+130.3000/+30.0000+130.2929/+30.0200+130.2868/+30.0400+130.2826/+30.0456+130.2800/+30.0600+130.2656/+30.0709+130.2600/+30.0800+130.2569/+30.1000+130.2552/+30.1200+130.2489/+30.1400+130.2437/+30.1576+130.2400/+30.1600+130.2387/+30.1616+130.2400/+30.1800+130.2428/+30.2000+130.2409/+30.2108+130.2400/+30.2200+130.2346/+30.2400+130.2262/+30.2600+130.2229/+30.2800+130.2213/+30.3000+130.2205/+30.3200+130.2201/+30.3222+130.2200/+30.3400+130.2051/+30.3600+130.2008/+30.3800+130.2002/+30.4000+130.2001/+30.4064+130.2000/+30.4200+130.1864/+30.4400+130.1815/+30.4585+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+130.2333/+30.4040+130.2200/+30.4200+130.2067/+30.4400+130.2012/+30.4588+130.2200/ 南 3 鹿児島県屋久島町 4650500 2026-09-21T00:00:00+09:00 2026-09-21T03:00:00+09:00 降灰 70 +30.4559+130.2000/+30.4599+130.2200/+30.4591+130.2400/+30.4400+130.2591/+30.4200+130.2599/+30.4000+130.2600/+30.3988+130.2600/+30.3800+130.2785/+30.3600+130.2796/+30.3400+130.2798/+30.3351+130.2800/+30.3200+130.2940/+30.3000+130.2983/+30.2800+130.2992/+30.2644+130.3000/+30.2600+130.3039/+30.2400+130.3156/+30.2200+130.3184/+30.2027+130.3200/+30.2000+130.3222/+30.1800+130.3379/+30.1686+130.3400/+30.1600+130.3497/+30.1420+130.3600/+30.1400+130.3611/+30.1200+130.3695/+30.1049+130.3800/+30.1000+130.3847/+30.0800+130.3898/+30.0600+130.3948/+30.0400+130.3993/+30.0386+130.4000/+30.0241+130.4200/+30.0200+130.4240/+30.0000+130.4315/+29.9800+130.4380/+29.9746+130.4400/+29.9600+130.4482/+29.9400+130.4586/+29.9378+130.4600/+29.9200+130.4700/+29.9000+130.4783/+29.8918+130.4800/+29.8800+130.4834/+29.8600+130.4963/+29.8548+130.5000/+29.8400+130.5073/+29.8200+130.5114/+29.8000+130.5185/+29.7843+130.5000/+29.8000+130.4865/+29.8123+130.4800/+29.8200+130.4692/+29.8230+130.4600/+29.8352+130.4400/+29.8400+130.4363/+29.8600+130.4236/+29.8648+130.4200/+29.8800+130.4051/+29.8839+130.4000/+29.9000+130.3870/+29.9081+130.3800/+29.9200+130.3721/+29.9400+130.3628/+29.9458+130.3600/+29.9600+130.3497/+29.9698+130.3400/+29.9800+130.3311/+30.0000+130.3214/+30.0200+130.3218/+30.0245+130.3200/+30.0400+130.3071/+30.0468+130.3000/+30.0600+130.2929/+30.0800+130.2880/+30.1000+130.2852/+30.1200+130.2820/+30.1264+130.2800/+30.1400+130.2654/+30.1484+130.2600/+30.1600+130.2534/+30.1675+130.2600/+30.1800+130.2624/+30.2000+130.2604/+30.2024+130.2600/+30.2200+130.2465/+30.2400+130.2420/+30.2600+130.2407/+30.2706+130.2400/+30.2800+130.2326/+30.3000+130.2226/+30.3200+130.2207/+30.3400+130.2202/+30.3455+130.2200/+30.3600+130.2060/+30.3800+130.2004/+30.4000+130.2001/+30.4200+130.2000/+30.4222+130.2000/+30.4400+130.1842/+30.4559+130.2000/ 南 80 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+130.2383/+30.4036+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 　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、２０日０９時から１２時までは火口から南方向、２０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。 　２０日９時から２１日３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 　２０日０９時から１２時まで　南　　　　　　　６０ｋｍ　　３ｋｍ　　　　　 　２０日１２時から１５時まで　南　　　　　　　６０ｋｍ　　３ｋｍ　　　　　 　２０日１５時から１８時まで　南　　　　　　　６０ｋｍ　　３ｋｍ　　　　　 　２０日１８時から２１時まで　南　　　　　　　７０ｋｍ　　３ｋｍ　　　　　 　２０日２１時から２４時まで　南　　　　　　　７０ｋｍ　　３ｋｍ　　　　　 　２１日００時から０３時まで　南　　　　　　　８０ｋｍ　　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。 　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。