Volcanic Activity Risk in Alaska

All Alaska counties ranked by FEMA National Risk Index volcanic activity score

Volcanic Activity risk — eruptions producing ashfall, lava, and pyroclastic hazards — is rated for 26 of 30 Alaska counties in FEMA's National Risk Index. Aleutians West Census Area carries the state's highest volcanic activity score at 98.7, with $3M in expected annual volcanic activity losses.

2 Alaska counties are rated High or Very High for volcanic activity, and expected annual losses from volcanic activity total roughly $4M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Volcanic Activity

#CountyVolcanic Activity ScoreRatingAnn. Freq.Ann. Loss
1 Aleutians West Census Area
98.7
High 0.16 / yr $3M
2 Aleutians East Borough
97.7
High 0.08 / yr $895K
3 Sitka City and Borough
93.8
Medium 0.00 / yr $141K
4 Prince of Wales-Hyder Census Area
90.9
Low 0.00 / yr $11K
5 Lake and Peninsula Borough
90.2
Low 0.06 / yr $9K
6 Kenai Peninsula Borough
89.9
Low 0.03 / yr $13K
7 Nome Census Area
89.6
Low 0.00 / yr $7K
8 Anchorage Municipality
87.3
Low 0.01 / yr $7K
9 Petersburg Borough
86.3
Low 0.00 / yr $3K
10 Matanuska-Susitna Borough
80.8
Very Low 0.02 / yr $915
11 Ketchikan Gateway Borough
80.1
Very Low 0.00 / yr $652
12 Denali Borough
71.3
Very Low 0.01 / yr $133
13 Wrangell City and Borough
67.8
Very Low 0.00 / yr $63
14 Kodiak Island Borough
65.8
Very Low 0.03 / yr $67
15 Copper River Census Area
63.8
Very Low 0.00 / yr $34
16 Dillingham Census Area
61.9
Very Low 0.03 / yr $26
17 Fairbanks North Star Borough
53.4
Very Low 0.00 / yr $23
18 Juneau City and Borough
50.5
Very Low 0.00 / yr $15
19 Bristol Bay Borough
46.3
Very Low 0.00 / yr $9
20 Southeast Fairbanks Census Area
42.3
Very Low 0.00 / yr $4
21 Bethel Census Area
42.0
Very Low 0.03 / yr $4
22 Yukon-Koyukuk Census Area
40.4
Very Low 0.02 / yr $4
23 Kusilvak Census Area
34.5
Very Low 0.00 / yr $2
24 Hoonah-Angoon Census Area
30.0
Very Low 0.00 / yr $1
25 Northwest Arctic Borough
29.3
Very Low 0.00 / yr $1
26 Haines Borough
16.0
Very Low 0.00 / yr $0

26 Alaska counties with measurable volcanic activity risk. See the national volcanic activity ranking or all Alaska counties by overall risk.

Frequently Asked Questions

Which Alaska county has the highest volcanic activity risk?

Aleutians West Census Area has the highest FEMA volcanic activity risk score in Alaska at 98.7 (High), with $3M in expected annual losses and about 0.16 events per year.

How many Alaska counties face significant volcanic activity risk?

26 Alaska counties record measurable volcanic activity risk in FEMA's National Risk Index; 2 of them are rated High or Very High.

Other Hazards in Alaska

Avalanche Coastal Flood Cold Wave Earthquake Hail Ice Storm Riverine Flood Landslide Lightning Strong Wind Tornado Tsunami Wildfire Winter Weather