Question

define foreshoks and and richter scale.

Answer 1

Richter scale. noun. a scale for expressing the magnitude of an earthquake in terms of the logarithm of the amplitude of the ground wave; values range from 0 to over 9 Compare Mercalli scale See also magnitude.

Answer 2

A foreshock is an earthquake that occurs before a larger seismic event (the ... that followed a foreshock is the 1960 Valdivia earthquake, which had a magnitude of 9.5 M W.