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earthquake vocab 1

earthquake

QuestionAnswer
seismic waves waves that travel through the earth.
P-wave primary seismic wave. wave movement is similar to wave direction. Wave that arrives first.
S-wave secondary seismic wave. wave movement is perpendicular to the direction of the wave.
surface wave Type of seismic wave that forms when s-waves and p-waves reach earth's surface.
lag time time between the arrival of the p-wave and the s-wave
epicenter point on the surface of the earth directly above the focus.
focus the point of origin for an earthquake. where the slippage occurs.
seismometer an instrument for measuring the direction, duration, and force of seismic waves.
seismograph a measuring instrument for recording the movement of seismic wave. Graph refers to the action of writing so a seismograph will actually graph the wave.
seismogram the graphical record of an earthquake. the actual recording on paper
Created by: jefhodge
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