Mt.St. Helen's 1980

Primary impacts - the immediate effect of the earthquake on property and people. e.g. People killed by being crushed or trappped in buildings that have collapsed due to the shaking.

Secondary impacts - the impacts on property and people after the event has happened. e.g. People who die from cholera because clean water supplies habve been disrupted by the earthquake.

Social impacts - impacts on people, homes and everyday life.

Economic impacts - impacts on jobs, businesses and the wider economy, e.g. cost to government and insurance companies.