Lag Time Calculation in Seismology

The video tutorial explains how to calculate the lag time between the arrival of P and S waves during an earthquake. It begins by defining lag time and demonstrating how to measure the arrival times of these waves. The tutorial provides a detailed walkthrough of calculating lag time using time increments and offers strategies for handling more complex scenarios. It concludes with a simplified example to reinforce the learning.

What is the primary difference between P waves and S waves?

• P waves travel slower than S waves.

• P waves are the first to arrive, followed by S waves.

• S waves are the first to arrive, followed by P waves.

• P waves and S waves arrive simultaneously.

How are the increments on the graph used to measure wave arrival times?

• Each line represents 15 seconds.

• Each line represents 10 seconds.

• Each line represents 5 seconds.

• Each line represents 20 seconds.

What is the first step in calculating the lag time between P waves and S waves?

• Subtract the hours first.

• Add the seconds first.

• Subtract the minutes first.

• Subtract the seconds first.

What should you do if the math for calculating lag time is not straightforward?

• Use a number line method.

• Convert minutes to seconds.

• Ignore the seconds.

• Use a calculator.

In the final example, what is the lag time calculated between the P wave and S wave?

• 6 minutes and 30 seconds

• 3 minutes and 30 seconds

• 4 minutes and 30 seconds

• 5 minutes and 30 seconds