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forces in earth's crust

stress a force that acts on rocks to change its shape or valume
focus the location with in the earth where the rock actually breaks
epicenter the location on the earth's surface directly above the focus
primary wave (P-wave) slinkey very fast (4-7 km/sec) pass through a solid liquid or gas arrives at recording station first
secondary wave (s-wave) a rope slower moving (2-5 km/sec) caused by shearing motion cant pass through fluid
surface waves produced when earthquake energy reaches the earth's surface slowest moving wave most destructive
seismogragph records the arrival time and magnitude of horizontal and vertical movement caused by an earthquake
the Richter scale used to express earthquakes magnitude on the basis of the height a (amplitude) of the larges line on a seisomgram
the mercalli scale measures the intensity of how people and structures are effective by the seismic event
Created by: bradleyc20