earthquakes

Front

What does the Richter scale measure?

Back

The strength of an earthquake.

Front

Where do many earthquakes occur?

Back

Along the borders of tectonic plates.

Front

What is the minimum number of seismograph stations needed to locate an earthquake epicenter?

Back

3

Front

Which city is likely far from the epicenter of an earthquake?

Back

Nome, Alaska.

Front

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

Back

It increases.

Front

What are tectonic plates?

Back

Large sections of the Earth's crust that move and interact with each other.

Front

What is an earthquake epicenter?

Back

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

Front

What are P waves?

Back

Primary waves that are the first to arrive during an earthquake, traveling through solids and liquids.

Front

What are S waves?

Back

Secondary waves that arrive after P waves, traveling only through solids.

Front

What is a seismogram?

Back

A record produced by a seismograph that shows the motion of the ground during an earthquake.