(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) | |
(2) Issued: | (20180916/1756Z) |
(3) Volcano: | Semisopochnoi (VNUM #311060) |
(4) Current Color Code: | YELLOW |
(5) Previous Color Code: | UNASSIGNED |
(6) Source: | Alaska Volcano Observatory |
(7) Notice Number: | |
(8) Volcano Location: | N 51 deg 55 min E 179 deg 35 min |
(9) Area: | Aleutians |
(10) Summit Elevation: | 2625 ft (800 m) |
(11) Volcanic Activity Summary: | An increase in seismicity beginning 16:31 UTC (08:31 AKDT) on has prompted AVO to raise the Aviation Color Code and Volcano Alert Level to YELLOW/ADVISORY. There is no clear indication from satellite imagery or regional infrasound data that Semisopochnoi is erupting at this time. AVO will continue to monitor Semisopochnoi seismic data and evaluate satellite images. |
(12) Volcanic cloud height: | Unknown |
(13) Other volcanic cloud information: | Unknown |
(14) Remarks: | |
(15) Contacts: | Chris Waythomas, Acting Scientist-in-Charge, USGS cwaythomas@usgs.gov (907) 786-7497 David Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 322-4085 |
(16) Next Notice: | A 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 http://www.avo.alaska.edu |
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