# Attenuation of air waves

Series Geophysical References Series Problems in Exploration Seismology and their Solutions Lloyd P. Geldart and Robert E. Sheriff 8 253 - 294 http://dx.doi.org/10.1190/1.9781560801733 ISBN 9781560801153 SEG Online Store

## Problem

For an airwave with velocity of 330 m/s and two geophones separated by 5 m, at what frequency is maximum attenuation achieved?

### Solution

Maximum attenuation is achieved when the waves recorded at the two geophones differ in phase by one-half wavelength. Therefore ${\displaystyle \lambda /2=5\ {\rm {m}}}$ and ${\displaystyle f=V/\lambda =330/10=33\ {\rm {Hz}}}$ Hz.