How Does a Seismograph Detect Vibrations from the Passing Wave

question 124

Multiple Choice

How does a seismograph detect vibrations from the passing wave front of an earthquake?

• A)The whole instrument moves up and down (or back and forth)on the ground, so that it starts jiggling a little weight inside that trips the detector to record the earthquake.
• B)The instrument is anchored to the ground or buried in a vault so that it is stationary with respect to the earth.When the instrument moves, the suspended mass inside is relatively stationary due to inertia.The relative motion registers the quake.
• C)The instrument vibrates with the ground as it rolls along a track above the hyypocentre.
• D)The wave front seeks out the instrument which stops vibrating when the wave front reaches it.

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Definitions:

Standard Deviation

A measure of the amount of variation or dispersion in a set of values, showing how spread out the data points are from the mean.

Chi-squared Distribution

A statistical distribution that is used to describe the distribution of a sum of squared random variables, often used in hypothesis testing.

Chi-squared Distribution

A statistical distribution that describes the distribution of the sum of the squares of a set of variables that follow a normal distribution, commonly used in hypothesis testing.

Positively Skewed

A distribution shape where the tail is longer on the right side, indicating that the mean and median are greater than the mode.