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AVO VOLCANO ACTIVITY NOTIFICATION
(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20160429/1936Z)
(3) Volcano: Cleveland (VNUM #311240)
(4) Current Color Code: YELLOW
(5) Previous Color Code: ORANGE
(6) Source: Alaska Volcano Observatory
(7) Notice Number: 2016/A8
(8) Volcano Location: N 52 deg 49 min W 169 deg 56 min
(9) Area: Aleutians
(10) Summit Elevation: 5676 ft (1730 m)
(11) Volcanic Activity Summary: No activity has been observed at Cleveland following the April 16 explosion. Seismicity returned to low levels within an hour of the explosion, and there have been no infrasound (pressure sensor) signals detected. Recent satellite views indicate that the August 2015 lava dome is gone and has been replaced with a small cinder cone within the summit crater. Based on seismic levels remaining low since the eruption, and no observations or reports of continued eruptive activity, AVO is reducing the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY.

(12) Volcanic cloud height: Unknown
(13) Other volcanic cloud information: Unknown
(14) Remarks: Cleveland volcano forms the western portion of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. The volcano is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. The most recent significant period of eruption began in February, 2001 and produced 3 explosive events that generated ash clouds as high as 39,000 ft above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. Since then, Cleveland has been intermittently active producing small lava flows, often followed by explosions that generate small ash clouds generally below 20,000 ft above sea level. These explosions also launch debris onto the slopes of the cone producing hot pyroclastic avalanches and lahars that sometimes reach the coastline.
(15) Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.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
Contact AVO Privacy Accessibility Information Quality FOIA
URL: www2.avo.alaska.edu/activity/report.php
Page modified: June 21, 2016 14:47
Contact Information: AVO Web Team

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