Volcanoes

Alaska is home to more than 40 volcanoes that have erupted in the last 200 years, and more than half of the state's population lives within 100 miles of an active volcano. The single greatest hazard from an explosive volcanic eruption is ash, fine fragments of rock blown into the atmosphere during volcanic eruption. Ash is carried downwind where the coarser particles fall to the ground and fine ash forms a cloud that is carried with the air currents. Ash is extremely abrasive, does not dissolve in water, and is heavy and slippery when wet. Inhaling ash can be dangerous, especially for those with breathing problems, for children, and the elderly. While ash is falling to the ground, you may experience prolonged darkness, loss of water and electricity, and have transportation and communication problems. Pilots should avoid flying if there is any ash in the air. Most emergency supplies to have on hand for volcanic eruptions are the same as those for earthquakes. In addition, you should have disposable dust-filtering face masks, automobile air and oil filters (but don't drive unless you must), windshield washer fluid, and cleaning supplies.

The Alaska Volcano Observatory monitors and studies Alaska's hazardous volcanoes.

What to do during a volcanic ash fall

• Stay indoors if possible.
• If you must drive, drive slowly.
• Minimize activity to keep inhalation of fine ash to a minimum.
• Close windows, doors, and dampers; do not run clothes dryers or exhaust fans.
• Place damp towels at door thresholds and other drafty areas.
• Remove ash from flat or low-pitched roofs and gutters to prevent their collapse.
• Shut down and cover sensitive equipment, like computers, TVs, and stereos.
• Listen to radio or TV for further information and instructions.