The worksheet provides an example problem and its solution to demonstrate how to use the travel time chart.
Step-by-step verification of the example:
1.
Identify the goal: Find the travel time for a P-wave traveling 4,000 km.
2.
Locate distance on the x-axis: The horizontal axis represents epicenter distance. Each major grid line typically represents 1,000 km. We locate the mark for 4,000 km (the 4th major vertical line).
3.
Find the correct curve: We need the P-wave time, so we look for the lower curve labeled "P".
4.
Trace up to the curve: Starting at 4,000 km on the x-axis, go straight up until you hit the "P" curve.
5.
Read the time on the y-axis: From that intersection point on the curve, look horizontally to the left to read the value on the y-axis (Travel Time in minutes). The red line in the diagram shows this path clearly. It aligns perfectly with the number 7.
The example states the answer is 7 minutes, which matches the reading from the graph.
Final Answer: 7 minutes
Parent Tip: Review the logic above to help your child master the concept of earthquake p wave and s wave travel time worksheet.
