locating earthquakes Stept A:A seismlogist at a seismograph station Seattle Wash

Question

locating earthquakes

Stept A:A seismlogist at a seismograph station Seattle Washington determined the distance to the earthquake, using the difference in arrival times of the P ans S waves. Then the seismologist constructed acound his station a circle, the radius ow which is the discance between the station and the earthquake.

Q 8.4 A this point , from the information in Figure 8.6A, how specific ca you be as concerns the location of that earthquake?

Stept B: A sismologist at a second seismograph station that at Berkeley, California applied the same procedure as that of the seismologist at Seattle.

Explanation / Answer

As the P and S waves travel out from an earthquake the P waves get progressively farther ahead of the S waves therefore the farther a seismic recording station is from the earthquake epicenter the greater will be the difference in time of travel of arrival between the P and S waves

Earthquakes area ocation by time difference in P and S wave method are precise and effective in these following ways -

* provides best image of the structural subsurface feature.

* It can detect both lateral Nad depth variations in a physically relevant parameter.

* It can be used to know stratigraphic and depositional feature .

* sometimes hydrocarbons can too directed through this method.

But sometimes this earthquake area location by time difference between P and S waves method have limitations too -

* data is expensive to acquire and data reduction and processing can be time consuming and it repairs requires a sophisticated computer hardware.

* It requires geophysical surveys which is quite expensive and time taking.

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