Earthquakes and Society

Predicting vs Forecasting Cannot predict the exact time and place of earthquakes However, can use data to make “forecasts”

Earthquake hazard: a measurement of how likely an area is to having damaging earthquakes in the future Determined by past and present activity

What is the relationship between earthquake magnitude and frequency?

What is the relationship between earthquake magnitude and frequency? Large earthquakes happen less often

Gap Hypothesis: sections of active faults that have had relatively few earthquakes are likely to be the sites of strong earthquakes in the future. Areas where few earthquakes have occurred are called seismic gaps

Earthquakes and Buildings Retrofitting: process of making older structures more earthquake-resistant Common ways to retrofit older homes Fasten the building to its foundation Use steel to strengthen brick

Other ways: Look in your book on page 237 Write down the names of 2 ways to retrofit BRIEFLY summarize that technique

Earthquake Preparation Before earthquake: safeguard home, make a plan, get emergency kits together

Earthquake Preparation During quake: Inside- crouch or lie face-down under a table or desk Outside- get away from trees, power lines, etc. Car- stop car, stay inside it.

Earthquake Preparation After quake- Stay calm Remove self from danger