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


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