[{"noticeHtml":"\u003Ctable\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 colspan=\u00222\u0022\u003E(1) \u003Cb\u003EVOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)\u003C\/b\u003E\u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 width=\u0022250\u0022\u003E(2) Issued:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(20251223\/2023Z)\u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(3) Volcano:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003EAniakchak (VNUM #312090)\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(4) Current Color Code:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E\u003Cb\u003EUNASSIGNED\u003C\/b\u003E\u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(5) Previous Color Code:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003EGREEN\u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(6) Source:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003EAlaska Volcano Observatory\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(7) Notice Number:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E2025\/A775\u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(8) Volcano Location:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003EN 56 deg 54 min W 158 deg 12 min\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(9) Area:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003EAlaska Peninsula\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(10) Summit Elevation:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E4400 ft (1341 m)\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(11) Volcanic Activity Summary:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E\n                        \u003Cspan name=\u0022summary\u0022\u003E\n                            \u003Cp class=\u0022hans-paragraph\u0022\u003EThe Alaska Volcano Observatory (AVO) is no longer receiving data from seismic stations on Aniakchak Volcano due to an ongoing power outage at the receive facility in Port Heiden. As a result AVO unable to (1) assess whether the volcano may be building towards an eruption and (2) quickly confirm or dismiss reports of activity.  \u003C\/p\u003E\u003Cp class=\u0022hans-paragraph\u0022\u003EBecause this volcano is no longer seismically monitored at adequate levels, the Aviation Color Code and Volcano Alert Level are changed to UNASSIGNED\/UNASSIGNED.  As at other volcanoes without real-time seismic networks, AVO will continue to use satellite data, regional seismic, infrasound and lightning networks, and reports from pilots and ground observers to detect signs of eruptive activity.\u003C\/p\u003E\n                        \u003C\/span\u003E\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(12) Volcanic cloud height:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003Enone\u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(13) Other volcanic cloud information:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003Enone\u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(14) Remarks:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E\u003Cp class=\u0022hans-paragraph\u0022\u003EAniakchak volcano, located in the central portion of the Alaska Peninsula, consists of a stratovolcano edifice with a 6 mile (10 km) diameter summit caldera. The caldera-forming eruption occurred around 3,500 years ago. Post-caldera eruptions have produced lava domes, tuff cones, and larger spatter and scoria cone structures, including Half-Cone and Vent Mountain, all within the caldera. The most recent eruption occurred in 1931 and created a new vent and lava flows on the western caldera floor while spreading ash over much of southwestern Alaska. Aniakchak volcano is 16 miles (26 km) southeast of the nearest community, Port Heiden, and 416 miles (670 km) southwest of Anchorage, Alaska. It is located in Aniakchak National Monument and Preserve.\u003C\/p\u003E\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(15) Contacts:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E\u003Cp class=\u0022hans-paragraph\u0022\u003EMatt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497\u003C\/p\u003E\u003Cp class=\u0022hans-paragraph\u0022\u003EJessica Larsen, Acting Coordinating Scientist, UAF \u003Ca href=\u0022mailto:jflarsen@alaska.edu\u0022\u003Ejflarsen@alaska.edu\u003C\/a\u003E (907) 378-5460\u003C\/p\u003E\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n                \u003Ctr\u003E\n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E(16) Next Notice:\u003C\/td\u003E \n                    \u003Ctd class=\u0022hans-td\u0022 valign=\u0022top\u0022\u003E\u003Cp class=\u0022hans-paragraph\u0022\u003EA new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at \u003Ca href=\u0022https:\/\/gcc02.safelinks.protection.outlook.com\/?url=http%3A%2F%2Fwww.avo.alaska.edu%2F&data=05%7C01%7Chdietterich%40usgs.gov%7C4e428a02cf274911103408db150551b8%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C638126884815330179%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=mrKsTvh8yVAs%2FbGq6tQapOq6Q773zJjI9UTvyFMD7YE%3D&reserved=0\u0022\u003Ehttp:\/\/www.avo.alaska.edu\u003C\/a\u003E.\u003C\/p\u003E\n                    \u003C\/td\u003E\n                \u003C\/tr\u003E\n            \u003C\/table\u003E","noticeSynopsis":"Status changed to Unmonitored due to seismic station outages.  ","sentUtc":"2025-12-23","obs":"avo","vName":"Aniakchak","vnum":"312090","noticeId":"DOI-USGS-AVO-2025-12-23T18:55:56+00:00","colorCode":"UNASSIGNED","alertLevel":"UNASSIGNED","noticeUrl":"https:\/\/volcanoes.usgs.gov\/hans2\/view\/notice\/DOI-USGS-AVO-2025-12-23T18:55:56+00:00","noticeData":"https:\/\/volcanoes.usgs.gov\/vsc\/api\/hansApi\/notice\/DOI-USGS-AVO-2025-12-23T18:55:56+00:00","nvewsThreat":"High Threat"}]