Monitoring Earthquakes

Front

What happens to the time between P and S waves as the distance from a seismic station to an earthquake increases?

Back

The time between P and S waves increases.

Front

Is it true that the highest risk of earthquakes in the United States is in the Midwest, around Ohio?

Back

False

Front

In a seismograph, what part vibrates to produce a pattern of zigzag lines?

Back

The drum.

Front

Which two tectonic plates form the San Andreas Fault?

Back

The Pacific Plate and the North American Plate.

Front

What does a higher line height on a seismograph indicate?

Back

A more severe earthquake or that the station is closer to the earthquake epicenter.

Front

What are seismic waves?

Back

Waves of energy that travel through the Earth, produced by earthquakes.

Front

What is the epicenter of an earthquake?

Back

The point on the Earth's surface directly above where the earthquake originates.

Front

What is a seismogram?

Back

A record produced by a seismograph that shows the intensity and duration of seismic waves.

Front

What is the difference between P waves and S waves?

Back

P waves are primary waves that travel faster and can move through solids and liquids, while S waves are secondary waves that only move through solids.

Front

What is the Richter scale?

Back

A scale used to measure the magnitude of an earthquake.