An Earthquake Emits Both S-Waves and P-Waves Which Travel at Different

question 24

Multiple Choice

An earthquake emits both S-waves and P-waves which travel at different speeds through the Earth. A P-wave travels at 9 000 m/s and an S-wave travels at 5 000 m/s. If P-waves are received at a seismic station 1.00 minute before an S-wave arrives, how far away is the earthquake center?

• A) 88.9 km
• B) 1 200 km
• C) 675 km
• D) 240 km
• E) 480 km

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Definitions:

T Value

A value derived from a T-test, used to determine the significance of differences between two sample means.

Independent Samples

Two or more groups of observations that are collected from separate populations and are not related or connected in any way.

Significance Level

The probability of rejecting the null hypothesis in a statistical test when it is actually true; a measure of the risk of making a Type I error.

Test Statistic

A calculated value used in statistical testing to determine whether to reject the null hypothesis.