2026-08-20T08:00:00Z 通常 気象庁本庁 気象庁 2026-08-20T17:00:00+09:00 2026-08-20T18:00:00+09:00 2026-08-21T12:00:00+09:00 506 発表 1 降灰予報 1.1_0 　現在、桜島は噴火警戒レベル３（入山規制）です。桜島で噴火が発生した場合には、２０日２１時から２４時までは火口から北西方向、２１日０９時から１２時までは火口から北西方向に降灰が予想されます。 降灰予報（定時） 06 桜島 506 降灰 70 鹿児島県鹿児島市 4620100 鹿児島県阿久根市 4620600 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 鹿児島県姶良市 4622500 小さな噴石の落下 75 鹿児島県鹿児島市 4620100 降灰予報（定時） 06 桜島 506 +3135.55+13039.40+1117/ 降灰 70 鹿児島県鹿児島市 4620100 鹿児島県阿久根市 4620600 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 鹿児島県姶良市 4622500 小さな噴石の落下 75 鹿児島県鹿児島市 4620100 2026-08-20T18:00:00+09:00 2026-08-20T21:00:00+09:00 降灰 70 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西 60 鹿児島県鹿児島市 4620100 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 小さな噴石の落下 75 1 +31.6095+130.6400/+31.6000+130.6495/+31.5988+130.6600/+31.5800+130.6788/+31.5612+130.6600/+31.5614+130.6400/+31.5747+130.6200/+31.5800+130.6127/+31.5939+130.6200/+31.6000+130.6230/+31.6095+130.6400/ 北西 4 鹿児島県鹿児島市 4620100 2026-08-20T21:00:00+09:00 2026-08-21T00:00:00+09:00 降灰 70 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北西 60 鹿児島県鹿児島市 4620100 鹿児島県阿久根市 4620600 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 鹿児島県姶良市 4622500 小さな噴石の落下 75 1 +31.6013+130.6200/+31.6104+130.6400/+31.6000+130.6504/+31.5988+130.6600/+31.5800+130.6788/+31.5612+130.6600/+31.5612+130.6400/+31.5738+130.6200/+31.5800+130.6123/+31.6000+130.6186/+31.6013+130.6200/ 北西 4 鹿児島県鹿児島市 4620100 2026-08-21T00:00:00+09:00 2026-08-21T03:00:00+09:00 降灰 70 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北西 70 鹿児島県鹿児島市 4620100 鹿児島県阿久根市 4620600 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 鹿児島県姶良市 4622500 小さな噴石の落下 75 1 +31.6045+130.6200/+31.6138+130.6400/+31.6000+130.6538/+31.5988+130.6600/+31.5800+130.6788/+31.5612+130.6600/+31.5617+130.6400/+31.5800+130.6206/+31.5927+130.6200/+31.6000+130.6157/+31.6045+130.6200/ 北西 4 鹿児島県鹿児島市 4620100 2026-08-21T03:00:00+09:00 2026-08-21T06:00:00+09:00 降灰 70 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北西 70 鹿児島県鹿児島市 4620100 鹿児島県阿久根市 4620600 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 鹿児島県姶良市 4622500 小さな噴石の落下 75 1 +31.6051+130.6200/+31.6144+130.6400/+31.6000+130.6544/+31.5988+130.6600/+31.5800+130.6788/+31.5612+130.6600/+31.5614+130.6400/+31.5777+130.6200/+31.5800+130.6177/+31.6000+130.6147/+31.6051+130.6200/ 北西 4 鹿児島県鹿児島市 4620100 2026-08-21T06:00:00+09:00 2026-08-21T09:00:00+09:00 降灰 70 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北西 80 鹿児島県鹿児島市 4620100 鹿児島県阿久根市 4620600 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 小さな噴石の落下 75 1 +31.6101+130.6200/+31.6131+130.6400/+31.6000+130.6531/+31.5988+130.6600/+31.5800+130.6788/+31.5612+130.6600/+31.5613+130.6400/+31.5725+130.6200/+31.5800+130.6125/+31.6000+130.6082/+31.6101+130.6200/ 北西 4 鹿児島県鹿児島市 4620100 2026-08-21T09:00:00+09:00 2026-08-21T12:00:00+09:00 降灰 70 +31.9829+130.1200/+31.9916+130.1400/+31.9915+130.1600/+31.9837+130.1800/+31.9800+130.1884/+31.9744+130.2000/+31.9602+130.2200/+31.9600+130.2202/+31.9521+130.2400/+31.9400+130.2568/+31.9375+130.2600/+31.9263+130.2800/+31.9200+130.2852/+31.9000+130.2976/+31.8952+130.3000/+31.8800+130.3065/+31.8750+130.3200/+31.8696+130.3400/+31.8600+130.3495/+31.8400+130.3548/+31.8361+130.3600/+31.8257+130.3800/+31.8200+130.3860/+31.8000+130.3962/+31.7987+130.4000/+31.7961+130.4200/+31.7800+130.4392/+31.7600+130.4396/+31.7576+130.4400/+31.7509+130.4600/+31.7400+130.4724/+31.7296+130.4800/+31.7200+130.4880/+31.7176+130.5000/+31.7000+130.5187/+31.6998+130.5200/+31.6896+130.5400/+31.6800+130.5496/+31.6795+130.5600/+31.6628+130.5800/+31.6600+130.5828/+31.6586+130.6000/+31.6400+130.6186/+31.6400+130.6200/+31.6278+130.6400/+31.6200+130.6478/+31.6200+130.6600/+31.6000+130.6800/+31.5800+130.6800/+31.5600+130.6798/+31.5402+130.6600/+31.5405+130.6400/+31.5600+130.6204/+31.5600+130.6200/+31.5600+130.6000/+31.5638+130.5800/+31.5800+130.5638/+31.5800+130.5600/+31.5804+130.5400/+31.5843+130.5200/+31.6000+130.5038/+31.6002+130.5000/+31.6017+130.4800/+31.6152+130.4600/+31.6200+130.4548/+31.6205+130.4400/+31.6225+130.4200/+31.6263+130.4000/+31.6267+130.3800/+31.6400+130.3667/+31.6466+130.3600/+31.6407+130.3400/+31.6421+130.3200/+31.6479+130.3000/+31.6600+130.2825/+31.6658+130.2800/+31.6800+130.2711/+31.6805+130.2600/+31.6830+130.2400/+31.6863+130.2200/+31.7000+130.2029/+31.7097+130.2000/+31.7200+130.1886/+31.7212+130.1800/+31.7262+130.1600/+31.7400+130.1407/+31.7407+130.1400/+31.7470+130.1200/+31.7600+130.1056/+31.7672+130.1000/+31.7800+130.0819/+31.7822+130.0800/+31.8000+130.0702/+31.8200+130.0611/+31.8233+130.0600/+31.8400+130.0514/+31.8600+130.0485/+31.8800+130.0506/+31.9000+130.0527/+31.9165+130.0600/+31.9200+130.0611/+31.9400+130.0712/+31.9522+130.0800/+31.9600+130.0893/+31.9691+130.1000/+31.9800+130.1149/+31.9829+130.1200/ 北西 70 鹿児島県鹿児島市 4620100 鹿児島県阿久根市 4620600 鹿児島県薩摩川内市 4621500 鹿児島県日置市 4621600 鹿児島県いちき串木野市 4621900 鹿児島県姶良市 4622500 小さな噴石の落下 75 1 +31.6078+130.6200/+31.6133+130.6400/+31.6000+130.6533/+31.5988+130.6600/+31.5800+130.6788/+31.5612+130.6600/+31.5613+130.6400/+31.5769+130.6200/+31.5800+130.6169/+31.6000+130.6095/+31.6078+130.6200/ 北西 4 鹿児島県鹿児島市 4620100 　現在、桜島は噴火警戒レベル３（入山規制）です。桜島で噴火が発生した場合には、２０日２１時から２４時までは火口から北西方向、２１日０９時から１２時までは火口から北西方向に降灰が予想されます。 　２０日１８時から２１日１２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１８時から２１時まで　西（鹿児島市街方向）　　　６０ｋｍ　　４ｋｍ　　　　　 　２０日２１時から２４時まで　北西（鹿児島市吉野方向）　６０ｋｍ　　４ｋｍ　　　　　 　２１日００時から０３時まで　北西（鹿児島市吉野方向）　７０ｋｍ　　４ｋｍ　　　　　 　２１日０３時から０６時まで　北西（鹿児島市吉野方向）　７０ｋｍ　　４ｋｍ　　　　　 　２１日０６時から０９時まで　北西（鹿児島市吉野方向）　８０ｋｍ　　４ｋｍ　　　　　 　２１日０９時から１２時まで　北西（鹿児島市吉野方向）　７０ｋｍ　　４ｋｍ　　　　　 　 　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：鹿児島市、日置市、薩摩川内市、いちき串木野市、阿久根市、姶良市 　 　噴煙が火口縁上３０００ｍ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。