SEISMIC PARTIAL COHERENCY STUDY
Abstract
Computational experiments have been conducted on a digital computer to illustrate numerically the usefulness of partial coherence techniques. The numerical results obtained demonstrate the necessity of employing partial coherence functions when a multi-input-single output linear system is involved. Two seismic noise traces were randomly selected from available Seismic Data Lab sources and were combined in various ways to obtain two correlated input traces and an output trace. From this data, gain factors and coherence functions were computed in two ways. First, just one input and one output were employed in the computations. Second, both inputs were accounted for. The numerical results vividly illustrate the biased answers obtained when only the single input and output are considered. This is contrasted with the correct results obtained via the proper model of a two input system. These procedures were also extended to a three input-single output system where the third input was ignored. In this case the application of partial coherence functions as an indicator of the existence of the third neglected seismic data source is illustrated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 28, 1965
- Accession Number
- AD0616255
Entities
People
- G. P. Thrall
- James C. Bradford
- L. D. Enochson
Organizations
- Teledyne Technologies