The accumulation of ash can also load down a plane which may cause the plane to rest on its tail. Ash on runways is another problem because anytime a plane lands or takes off the ash is resuspended. Currently much research is being done in using satellites to track volcanic clouds. For more information about tracking ash clouds using remote sensing devices click here . Tephra can also destroy vegetation which can result in famine.
Famines are the largest indirect hazard produced by volcanic eruptions.
Residents in areas that may be affected by volcanic ash during an eruption, need to be prepared. They should stock up on water and food supplies, stay indoors to avoid having clothing burnt or skin irritated by acids carried by volcanic ash, avoid going outside without a wet cloth or some sort of filter over their mouth and nose, stay in areas that are unlikely to receive large amounts of tephra or large sized tephra, avoid staying in buildings that are flat-roofed, and be prepared to be without telephones, electricity, and radio communication. Residents should also be prepared to do a lot of cleanup, and when doing this be careful not to resuspend the ash. Tephra produces many hazards but is also very beneficial. Its greatest benefit is that it produces fertile soil for crops.