Yellowstone Eruption Preparedness: No Specific Civilian Plan Exists

The US government **does not have a specific public preparedness plan for a Yellowstone supereruption**, because:

• Probability is extremely low: ~0.00014% per year (1 in 730,000). Last supereruption: 631,000 years ago.
• No imminent signs: Monitoring (USGS Yellowstone Volcano Observatory) shows background activity only.
• Unpredictable timing/scale: Could be hydrothermal explosion, lava flow, or (very rarely) caldera-forming event.

What *Does* Exist

• Monitoring: Real-time seismic, GPS, gas, thermal sensors; 24/7 watch.
• Alert System: USGS Volcano Alert Levels (Normal, Advisory, Watch, Warning) + Aviation Color Codes.
• Coordination: Interagency (USGS, NPS, FEMA, states, counties) response frameworks for volcanic unrest.
• Public Info: YVO monthly updates, hazard maps, eruption scenarios.

General Preparedness Applies

Standard all-hazards readiness covers volcanic ashfall: emergency kits, family plans, N95 masks, shelter-in-place knowledge, vehicle air filters. FEMA's Ready.gov includes volcano guidance.

Realistic Threats

More likely: hydrothermal explosions (local), earthquake swarms, toxic gas emissions. A supereruption would be continental/global catastrophe—response would be improvised at federal level.

Focus: stay informed via YVO; prepare for *likely* local hazards.