# Vertical resolution

Series Geophysical References Series Problems in Exploration Seismology and their Solutions Lloyd P. Geldart and Robert E. Sheriff 6 181 - 220 http://dx.doi.org/10.1190/1.9781560801733 ISBN 9781560801153 SEG Online Store

## Problem 6.19a

Approximately, what are the dominant frequencies for reflections in Figure 6.19a that arrive at the right side of the section at about 0.6, 1.2, and 1.8 s?

### Background

Resolution is discussed in problem 6.18 where it is shown that the resolvable thickness is $\lambda /4$ .

### Solution

Measuring peak-to-peak time intervals for several cycles on an enlarged figure, we get periods of about 20, 30, and 40 ms, or frequencies of 50, 33, and 25 Hz, for the three reflections.

## Problem 6.19b

If the velocities at these reflectors are 2.0, 3.0, and 5.0 km/s, respectively, what are the resolvable thicknesses?

### Solution

Resolvable thicknesses are about $\lambda /4=V/4f$ . This yields thicknesses of 10, 23, and 50 m, respectively.