Filtering in its general sense represents an important phase of data processing. In recent years such new methods as delay line filtering and digital filtering as well as conventional seismic filtering have been described in the literature. The purpose of this paper is to clarify the relationship between these methods of filtering and to compare design criteria such as cross‐correlation filtering and zero‐phase filtering. Synthetic records as well as field records are used to illustrate the effects of the various filtering techniques.

The purpose of this paper is to present a general theory and some techniques for analyzing, estimating, and displaying the characteristics of wave noise, random noise, and reflection signal, in a form convenient for designing and evaluating multiple seismometer arrays and filters. Modifications of the characteristics resulting from weathering and elevation variations, and modifications of the array responses resulting from variations in plant and seismometer spacing are discussed. Criteria for the design of arrays are presented along with a multiple seismometer nomogram based on a specific set of criteria.

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