For the purposes of this chapter, Emergency means any manmade or natural event or circumstance causing or threatening loss of life, injury to person or property, human suffering or financial loss to the extent that extraordinary measures must be taken to protect the public health, safety and welfare. These events shall include but not be limited to fire, explosion, flood, severe weather, drought, earthquake, volcanic activity, spills of oil or other hazardous substances, disease, blight, infestation, utility or transportation service disruptions, civil disturbance, riot, sabotage and war.