The Richter scale is used, from 0.1 to 9.0 magnitude. The Richter scale is determined from the logarithm of the amplitude of waves recorded by seismographs.
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1)area of the earth from angular distance of 104to 140 degress from a given earthquake that does not receive any direct p waves.
2)the s wave shadow zone os the area of the earth's surface where s waves are not detected following an earthquake.
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