P and S wave Travel Time Chart Practice

Front

What are P-waves?

Back

P-waves, or primary waves, are seismic waves that travel fastest through the Earth and can move through solids, liquids, and gases.

Front

What are S-waves?

Back

S-waves, or secondary waves, are seismic waves that travel slower than P-waves and can only move through solids.

Front

What is a shadow zone in seismology?

Back

A shadow zone is an area on the Earth's surface where no seismic waves are detected after an earthquake, indicating the presence of a liquid outer core.

Front

How do P-waves and S-waves differ in terms of travel through the Earth's layers?

Back

P-waves can travel through both solid and liquid layers, while S-waves can only travel through solid layers.

Front

If a P-wave takes 5 minutes to reach a seismic station, how long does it take for an S-wave to travel the same distance?

Back

Approximately 9 minutes.

Front

What is the typical ratio of P-wave to S-wave travel times?

Back

S-waves typically take about 1.7 times longer than P-waves to travel the same distance.

Front

What happens to S-waves when they reach the Earth's outer core?

Back

S-waves are absorbed and do not travel through the liquid outer core.

Front

What is the significance of the difference in travel times between P-waves and S-waves?

Back

The difference in travel times helps seismologists determine the distance to the earthquake epicenter and the structure of the Earth's interior.

Front

How long does it take for an S-wave to arrive after a P-wave from an earthquake 4000 km away?

Back

It takes approximately 5 minutes and 35 seconds.

Front

What types of materials can P-waves travel through?

Back

P-waves can travel through solids, liquids, and gases.