Travelling only through the crust, surface waves arrive after body waves. though they arrive later than body waves, surface waves are predominantly responsible for the damage and destruction caused by

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: