Disturbances inside Earth’s core cause earthquakes. The starting point of the disturbance is called the epicenter. Why does the amplitude of a seismic wave usually decrease as the wave moves away from the epicenter?
The waves lose energy in the form of heat.
The frequency of the waves continues to increase.
The wavelength of the waves continues to decrease.
The waves encounter entirely different mediums.

The amplitude of a seismic wave usually decreases as the wave moves away from the epicenter because the waves lose energy in the form of heat.

What is an Amplitude of wave?

It is the maximum distance from the mean point of the wave.

The amplitude of the seismic waves decreases with distance because waves spread in the larger area and dissipate heat.

The frequency of the seismic wave remains constant.

The wavelength of the wave decrease when it enters the denser medium.

Therefore, the amplitude of a seismic wave usually decreases as the wave moves away from the epicenter because the waves lose energy in the form of heat.

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