Question

Above is an example seismogram from a famous 1989 earthquake in California recorded at a seismic station in Finland. Time is on the x-axis and ground displacement is on the y-axis. Notice that the ground displacement is measured in microns (1/1000 of a millimeter!). Identify the arrival times of the different types of seismic waves.

Answer 1

The S wave arrived at approximately 12 seconds while the P wave arrived at approximately 7 seconds.

How to calculate the distance?

It should be noted that one can calculate the distance using the seismic travel time.

It can be deduced that the S wave arrived at approximately 12 seconds while the P wave arrived at approximately 7 seconds.

The time difference will be:

= 12 - 7

= 5

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