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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
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| (2) Issued: |
(20200908/2152Z) |
| (3) Volcano: |
Makushin (VNUM #311310) |
| (4) Current Color Code: |
GREEN |
| (5) Previous Color Code: |
YELLOW |
| (6) Source: |
Alaska Volcano Observatory |
| (7) Notice Number: |
|
| (8) Volcano Location: |
N 53 deg 53 min W 166 deg 55 min |
| (9) Area: |
Aleutians |
| (10) Summit Elevation: |
5906 ft (1800 m) |
| (11) Volcanic Activity Summary: |
Seismicity at Makushin Volcano has been steadily declining for months, following an earthquake sequence that began on June 15, 2020. This earthquake sequence was focused within an area about 6 miles (10 km) east of the summit at a depth of about 5 miles (8 km). Current observations indicate seismic activity has returned to background levels, and thus the Aviation Color Code and the Volcano Alert Level are being decreased to GREEN/NORMAL. Other data streams showed no signs of surface changes during the seismic sequence that started in June. The volcano is monitored with a network of seismic instruments, web camera, GPS, satellite data, and regional infrasound and lightning detection instruments. |
| (12) Volcanic cloud height: |
n/a |
| (13) Other volcanic cloud information: |
n/a |
| (14) Remarks: |
Makushin volcano is located on northern Unalaska Island in the eastern Aleutian Islands. Makushin is a broad, ice-capped stratovolcano which rises to an elevation of 6680 feet. The summit caldera, 3 km diameter, is the site of frequent steam and minor ash eruptions; however, no large eruptions have occurred in this century. The community of Unalaska and port of Dutch Harbor are located 25 km (16 miles) east of Makushin volcano. |
| (15) Contacts: |
Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497
David Fee, Coordinating Scientist, UAFGI
dfee1@alaska.edu (907) 322-4085 |
| (16) Next Notice: |
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AVO/USGS Volcanic Activity Notice
Volcano:
Makushin (VNUM #311310)
Current Volcano Alert Level: NORMAL
Previous Volcano Alert Level: ADVISORY
Current Aviation Color Code: GREEN
Previous Aviation Color Code: YELLOW
Issued: Tuesday, September 8, 2020, 1:52 PM AKDT
Source:
Alaska Volcano Observatory
Notice Number:
Location: N 53 deg 53 min W 166 deg 55 min
Elevation: 5906 ft (1800 m)
Area:
Aleutians
Volcanic Activity Summary: Seismicity at Makushin Volcano has been steadily declining for months, following an earthquake sequence that began on June 15, 2020. This earthquake sequence was focused within an area about 6 miles (10 km) east of the summit at a depth of about 5 miles (8 km). Current observations indicate seismic activity has returned to background levels, and thus the Aviation Color Code and the Volcano Alert Level are being decreased to GREEN/NORMAL. Other data streams showed no signs of surface changes during the seismic sequence that started in June. The volcano is monitored with a network of seismic instruments, web camera, GPS, satellite data, and regional infrasound and lightning detection instruments.
Recent Observations:
[Volcanic cloud height] n/a
[Other volcanic cloud information] n/a
Remarks: Makushin volcano is located on northern Unalaska Island in the eastern Aleutian Islands. Makushin is a broad, ice-capped stratovolcano which rises to an elevation of 6680 feet. The summit caldera, 3 km diameter, is the site of frequent steam and minor ash eruptions; however, no large eruptions have occurred in this century. The community of Unalaska and port of Dutch Harbor are located 25 km (16 miles) east of Makushin volcano.
Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497
David Fee, Coordinating Scientist, UAFGI
dfee1@alaska.edu (907) 322-4085
The 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.