EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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by comparing arrival times of P waves and S waves at several seismograph stations
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by digging at several locations and comparing data
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by comparing departure times of P waves and S waves at several seismograph stations
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by reviewing satellite photos of tsunamis
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Detailed explanation-1: -Assuming that we know the relative speed of P-and S-waves, the time difference between the arrivals of the P-and S-waves determines the distance the earthquake is from the seismometer. By looking at the seismograms from different recording stations, we can find out the epicentre of the earthquake.
Detailed explanation-2: -Finding the Distance to the Epicenter Measure the distance between the first P wave and the first S wave. In this case, the first P and S waves are 24 seconds apart. Find the point for 24 seconds on the left side of the chart of simplified S and P travel time curves and mark that point.
Detailed explanation-3: -Triangulation can be used to locate an earthquake. The seismometers are shown as green dots. The calculated distance from each seismometer to the earthquake is shown as a circle. The location where all the circles intersect is the location of the earthquake epicenter.
Detailed explanation-4: -Difference in arrival times between P and S waves can be used to determine the distance between the station and an earthquake. By knowing how far away the quake was from three stations we can draw a circle around each station with a radius equal to its distance from the earthquake.
Detailed explanation-5: -By measuring the time interval between the arrivals of the P and S wave groups seismologists are able to calculate the distance between the seismograph and the origin of the earthquake. Magnitude is then derived from the amplitude of the waves on the seismogram and the distance of the earthquake from the seismograph.