Question

hand draw in this space or click here to select edit to use the drawing tool. label ( ) the first p - wave and the first s - wave. estimate the time difference (δt), and then use your graph to find the distance to the epicenter. (as in the gizmo, each vertical line represents 50 seconds.)

Explanation:

Step1: Identify P - wave and S - wave

P - waves arrive first and have a higher velocity. S - waves arrive later. On the seismogram, mark the first arrival as the P - wave and the second arrival as the S - wave.

Step2: Calculate time difference ($\Delta t$)

Count the number of vertical lines between the first P - wave and the first S - wave arrival. Multiply the number of lines by 50 seconds (since each vertical line represents 50 seconds) to get $\Delta t$.

Step3: Find distance to epicenter

Use the relationship between $\Delta t$ and distance on the given graph. Locate the value of $\Delta t$ on the x - axis of the graph and read the corresponding distance value on the y - axis.

Answer:

(The values of $\Delta t$ and Distance will depend on the actual seismogram readings. Without specific readings from the seismogram, we cannot give numerical answers. But the above steps show how to calculate them.)