Earthquake Epicenter

Front

What is an earthquake epicenter?

Back

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

Front

What are P-waves?

Back

Primary waves that are the first to arrive at a seismic station; they are compressional waves that travel through solids, liquids, and gases.

Front

What are S-waves?

Back

Secondary waves that arrive after P-waves; they are shear waves that can only travel through solids.

Front

How do you calculate the distance to an earthquake epicenter using P-wave and S-wave arrival times?

Back

The difference in arrival times of P-waves and S-waves can be used to calculate the distance to the epicenter using a specific formula.

Front

What does a larger circle on a seismic map indicate?

Back

A larger circle indicates a seismic station that is farther from the earthquake epicenter.

Front

What does a smaller circle on a seismic map indicate?

Back

A smaller circle indicates a seismic station that is closer to the earthquake epicenter.

Front

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

Back

The difference in arrival times helps determine the distance from the seismic station to the earthquake epicenter.

Front

If a seismic station records a P-wave arrival at 10:00:00 and the S-wave arrives 5 minutes and 40 seconds later, what time did the S-wave arrive?

Back

10:05:40.

Front

What is the formula to estimate the distance to the epicenter based on P-wave and S-wave arrival times?

Back

Distance (km) = (Difference in time (seconds) x 8) / 60.

Front

What is the role of seismic stations in earthquake detection?

Back

Seismic stations detect and record seismic waves, helping to locate the epicenter and assess the earthquake's magnitude.