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Earth science 8.2
 

Earth science 8.2

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    Earth science 8.2 Earth science 8.2 Presentation Transcript

    •  Instrument that records earthquake waves.
    •  Modern seismograms amplify and electronically record ground motion, producing a trace.
    •  Also called L waves, are seismic waves that travel along Earth’s outer layer.
    •  Push pull waves. Compress and expand rocks in the direction the wave travels.
    •  Shake particles at right angles to their direction of travel.
    •  Derived from the amount of displacement that occurs along the fault.
    •  A seismogram shows all three types of seismic waves- surface waves, P waves, and S waves
    • Travel- time graphs from three or more seismographs can be used to find exact location of an earthquake epicenter.
    •  Historically, scientists have used two different types of measurements to describe the size of an earthquake- intensity and magnitude
    •  Moment magnitude is the most widely used measurement for earthquakes because it is the only magnitude scale that estimates the energy released by earthquakes.