A seismograph studies earthquakes records earthquakes is an earthquake recording

Question

A seismograph studies earthquakes records earthquakes is an earthquake recording is a crack in the earth San Andreas fault; from USGS.gov 2. S-waves are faster than P-waves. True False 3. Which are stronger, S-waves or P-waves? S-waves P-waves either one 4. You don't know, from the seismogram, when the earthquake happened. How then can you determine the distance from the seismograph to the epicenter? An instrument at the epicenter records the time, precise to the microsecond. Multiple seismographs can readily be used to determine the distance. The frequency of the P-waves provides a measure of the time. The difference in speed between the P-waves and S-waves allows this calculation. 5. What is the least number of seismographs necessary to estimate the location of an epicenter? 1 2 3 4 Hector Mine fault; from USGS.gov 6. Many locations have several seismographs. Can you find the epicenter from three seismograms that used seismographs at the same location? Yes No

Explanation / Answer

1) seismograph studies earthquakes

2) false

P waves(primary wave) are faster than s waves( secondary wave)

3)s wave.

shear wave which causes oscillations in the ground, but the p wave compresses the medium

4)The difference in speed between the P-waves and S-waves allows this calculation.

5)3

using three seismographs we can precisely determine the epicenter

6)no

we have to get the seismograph from three different locations.

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