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Identify the true statement.
A. Earthquakes never have hypocenters (foci) deeper than about 100 km (60 miles).
B. Seismic waves become smaller in amplitude with decreasing distance to the epicenter.
C. Earthquake magnitude is based on ground motion recorded by a seismograph; intensity is based on the amount of damage produced.
D. Contour lines representing Richter values are used to delimit zones of earthquake intensity; the greater the quake, the higher the intensity values and the wider the zones.

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Martebi

Thee  true statement is that Earthquake magnitude is based on ground motion recorded by a seismograph; intensity is based on the amount of damage produced.

How is the magnitude of an earthquake known by a seismograph?

The Richter magnitude of an earthquake is known to be seen through the use of the logarithm of the amplitude of waves as recorded by a seismographs.

The different Adjustments rates are included for the variation that exist between  the distance from various seismographs and the epicenter of the earthquakes.

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