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Calculated by finding difference between arrival of P and S waves
How do you find the distance to an earthquake
Sensor is farther from epicenter
What is indicated by a bigger interval between the arrival of the waves at the sensor
Feature of earth's surface -- first thought to cause earthquakes, then thought to be result, now known to be feature caused by movement of tectonic plates
San Andreas Fault
most well-known fault -- type is strike-slip between the Pacific and North American tectonic plates
70 km or deeper
How deep does a quake need to be before it will not be felt -- thought to be quakes along fault line where one plate is sub ducting under other plates
save lives not property
Why are prediction techniques being developed -- also why are building materials and methods being improved
what is sometimes preceded by an earthquake -- not known if the earthquake causes it though
Note places where lots occur and then see what gap between is and how often they occurred in the past
Today's prediction method
knowledge of deeper terrain (inner layers)
What is needed to understand why and when earthquakes will be happening
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