Is it safe to hike in ash-affected areas after an eruption?

Ash Hazards

Hiking in ash-affected areas poses significant health risks due to the inhalation of ash particles, which can cause respiratory problems and other health issues. The finer particles can penetrate deep into the lungs, increasing the risk of respiratory illness and even death. To minimize risks, wear a respirator mask rated for fine particulate matter (N95 or N100) when hiking in ash-affected areas, and avoid areas with heavy ashfall.

Terrain Hazards

Eruptions can also weaken terrain due to the loss of vegetation, soil instability, and the potential for ash-induced landslides. Steep slopes and areas with recent ashfall are particularly hazardous, as they can collapse without warning. To assess the terrain safely, look for signs of instability such as mudflows, rockfall, and cracks in the ground. When hiking, stay on designated trails, avoid steep slopes, and watch for ash-filled gullies or ravines that can be prone to landslides.

Precautionary Measures

Before hiking in ash-affected areas, check local authorities’ recommendations and guidelines. Follow any evacuation orders and stay informed about weather forecasts, which can indicate potential ashfall or other hazards. Bring essential supplies, such as food, water, and a first aid kit, and consider carrying a personal locator beacon (PLB) or satellite phone in case of emergencies. Always let someone know your itinerary and expected return time, and be prepared to adapt your plans in response to changing conditions.