Volcanic Activity Risk in Arizona
All Arizona counties ranked by FEMA National Risk Index volcanic activity score
Volcanic Activity risk — eruptions producing ashfall, lava, and pyroclastic hazards — is rated for 9 of 15 Arizona counties in FEMA's National Risk Index. Coconino County carries the state's highest volcanic activity score at 85.7, with $3K in expected annual volcanic activity losses.
No Arizona county reaches the High band for volcanic activity, and expected annual losses from volcanic activity total roughly $3K statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Volcanic Activity
| # | County | Volcanic Activity Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Coconino County | Low | 0.00 / yr | $3K | |
| 2 | Mohave County | Very Low | 0.00 / yr | $22 | |
| 3 | Yuma County | Very Low | 0.00 / yr | $23 | |
| 4 | Apache County | Very Low | 0.00 / yr | $11 | |
| 5 | Yavapai County | Very Low | 0.00 / yr | $16 | |
| 6 | Navajo County | Very Low | 0.00 / yr | $9 | |
| 7 | La Paz County | Very Low | 0.00 / yr | $4 | |
| 8 | Greenlee County | Very Low | 0.00 / yr | $0 | |
| 9 | Gila County | Very Low | 0.00 / yr | $0 |
9 Arizona counties with measurable volcanic activity risk. See the national volcanic activity ranking or all Arizona counties by overall risk.
Frequently Asked Questions
Which Arizona county has the highest volcanic activity risk?
Coconino County has the highest FEMA volcanic activity risk score in Arizona at 85.7 (Low), with $3K in expected annual losses and about 0.00 events per year.
How many Arizona counties face significant volcanic activity risk?
9 Arizona counties record measurable volcanic activity risk in FEMA's National Risk Index; 0 of them are rated High or Very High.