do now – in notebooks what are some effects of earthquakes? why is intensity not always the same...
TRANSCRIPT
Do Now – In Notebooks
What are some effects of earthquakes?
Why is intensity not always the same as magnitude for an earthquake?
Structural Failure
Stone and concrete Easily damaged
Wooden structures Withstand
Earthquakes Better Steel-framed
buildings High rises are
reinforced to make them earthquake resistant
Land and Soil Failure
Massive landslides Earthquakes
liquefy surface materials which then behave like quicksand
Greatest damage in soft soil
How do Tsunamis form?
Tsunami sources displace water in the ocean
Gravity then acts to restore displaced water
A wave is generated that travels as an expanding ring across the ocean’s surface
Earthquake Forecasting
Calculating the probability of an earthquake
Done by following: History of Earthquakes in an area Rate at which strain builds up in the
rocks
Where do Earthquakes Occur? Earthquakes are not randomly
distributed Majority of earthquakes occur along
seismic belts (Almost 80% at Circum-Pacific Belt)
Seismic gaps Place along an active fault that has not
experienced an earthquake for a long time