ADAPTIVE LONG‐PERIOD MULTIPLE ATTENUATION*

A least squares estimation procedure is used to estimate the pulse‐shape, amplitude function, and arrival time of multiple reflected signals. The estimates of the multiple reflections are subtracted from the data which are subsequently processed by standard methods. The estimation algorithm is applied continuously along the seismic line for each shot point or common datum point. In some cases it is advantageous to apply a pulse‐shaping filter prior to using the estimation algorithm.

The effectiveness of the technique is demonstrated by studying common shot point gathers, velocity analyses, and stacked sections derived from field data.