(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20081009/2159Z)
(3) Volcano:	Cleveland (VNUM #311240)
(4) Current Color Code:	UNASSIGNED
(5) Previous Color Code:	YELLOW
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:	2008/A30
(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:	AVO is downgrading the Level of Concern Color Code for Cleveland Volcano to UNASSIGNED and the Alert Code to UNASSIGNED. Because Cleveland is not monitored with real-time seismic instrumentation, we do not assign it green or normal, because the absence of unrest cannot be confirmed. The level of volcanic activity at Cleveland has declined significantly over the past month. The last thermal anomaly observed in satellite imagery was on September 4 and clear web-camera views show a white snow-capped summit. AVO has received no information to suggest that volcanic activity is continuing.
(12) Volcanic cloud height:
(13) Other volcanic cloud information:
(14) Remarks:	AVO monitors Cleveland Volcano with satellite imagery as weather allows. The lack of a real-time seismic network at Cleveland prevents AVO from tracking local earthquake activity related to volcanic unrest. Short-lived explosions of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery. Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage.
(15) Contacts:	Tom Murray, Scientist-in-Charge, USGS tlmurray@usgs.gov (907) 786-7497 Steve McNutt, Coordinating Scientist, UAF steve@giseis.alaska.edu (907) 474-7131
(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

---

AVO/USGS Volcanic Activity Notice

Volcano: Cleveland (VNUM #311240)

Current Volcano Alert Level: UNASSIGNED
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: UNASSIGNED
Previous Aviation Color Code: YELLOW

Issued: Thursday, October 9, 2008, 1:59 PM AKDT
Source: Alaska Volcano Observatory
Notice Number: 2008/A30
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians

Volcanic Activity Summary: AVO is downgrading the Level of Concern Color Code for Cleveland Volcano to UNASSIGNED and the Alert Code to UNASSIGNED. Because Cleveland is not monitored with real-time seismic instrumentation, we do not assign it green or normal, because the absence of unrest cannot be confirmed.

The level of volcanic activity at Cleveland has declined significantly over the past month. The last thermal anomaly observed in satellite imagery was on September 4 and clear web-camera views show a white snow-capped summit. AVO has received no information to suggest that volcanic activity is continuing.

Remarks: AVO monitors Cleveland Volcano with satellite imagery as weather allows. The lack of a real-time seismic network at Cleveland prevents AVO from tracking local earthquake activity related to volcanic unrest. Short-lived explosions of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.

Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage.

Contacts: Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497

Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

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

---