A common type of synthetic wavelet in reflection seismology.
- f1 = low-cut frequency
- f2 = low-pass frequency
- f3 = high-pass frequency
- f4 = high-cut frequency
An example might have frequencies of 5–10–40–45 Hz. This defines a trapezoidal shape in the frequency spectrum.
Ormsby-filtered wavelets have several sidelobes, unlike Ricker wavelets which only have two, one either side.
- Ryan, 1994. A choice of wavelets. CSEG Recorder September 1994.
- Ormsby filter — Sheriff's Encyclopedic Dictionary