19.2 seismic waves and earths interior
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Locating an Earthquake
scientists identify the seismic stations on a map •draw a circle with the radius of distance to the epicenter from each station. •point where all the circles intersect is the epicenter.
Shadow Zones
Areas on Earth's surface where no seismic waves are recorded
Seismometer
Instrument used to measure horizontal or vertical motion during an earthquake.
Travel-Time Curves
Plots of the distance traveled by P and S waves as a function of time
Seismograms
Record produced by a seismometer
True or False
S-waves disappear in the putter core then reappear in the mantle
True or False
Seismic waves can be used to locate slabs of crust and plumes of magma