(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170424/1943Z)
(3) Volcano:	Cleveland (VNUM #311240)
(4) Current Color Code:	ORANGE
(5) Previous Color Code:	YELLOW
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:
(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:	Recent satellite images show a new lava dome has been extruded in the summit crater of Cleveland. The dome began growing sometime after the most recent explosion on March 31. Slightly elevated surface temperatures have been observed in satellite images for the past couple of weeks. The first visual indication of new dome growth was observed in satellite images on April 15 with the presence of a small (less than 10-meter-diameter) mound deep in the March 31 crater. By April 23, this mound had grown to 45 meters in diameter. Dome growth has occurred with no obvious detectable seismicity. The presence of a growing lava dome in the summit crater of Cleveland prompts AVO to raise the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH.
(12) Volcanic cloud height:	N/A
(13) Other volcanic cloud information:	N/A
(14) Remarks:	Cleveland volcano is not monitored with a full real-time seismic network and this inhibits AVO's ability to detect unrest that may lead to future activity. We are able to detect explosive activity using infrasound and limited seismic instruments on the island.
(15) Contacts:	Chris Waythomas, Acting Scientist-in-Charge, USGS chris@usgs.gov (907) 786-7497 Jeff Freymueller, Coordinating Scientist, UAFGI jfreymueller@alaska.edu (907) 322-4085
(16) Next Notice:

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AVO/USGS Volcanic Activity Notice

Volcano: Cleveland (VNUM #311240)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: YELLOW

Issued: Monday, April 24, 2017, 11:43 AM AKDT
Source: Alaska Volcano Observatory
Notice Number:
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians

Volcanic Activity Summary: Recent satellite images show a new lava dome has been extruded in the summit crater of Cleveland. The dome began growing sometime after the most recent explosion on March 31. Slightly elevated surface temperatures have been observed in satellite images for the past couple of weeks. The first visual indication of new dome growth was observed in satellite images on April 15 with the presence of a small (less than 10-meter-diameter) mound deep in the March 31 crater. By April 23, this mound had grown to 45 meters in diameter. Dome growth has occurred with no obvious detectable seismicity. The presence of a growing lava dome in the summit crater of Cleveland prompts AVO to raise the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH.

Recent Observations:
[Volcanic cloud height] N/A
[Other volcanic cloud information] N/A
[Lava flow/dome] Growth of 45-meter-diameter lava dome in summit crater.

Remarks: Cleveland volcano is not monitored with a full real-time seismic network and this inhibits AVO's ability to detect unrest that may lead to future activity. We are able to detect explosive activity using infrasound and limited seismic instruments on the island.

Contacts: Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jfreymueller@alaska.edu (907) 322-4085

aThe Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

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