Skip Links

USGS - science for a changing world

U.S. Geological Survey Crustal Studies Technical Letter Number 2

In cooperation with the Defense Advanced Research Projects Agency

Digital Processing of Array Seismic Recordings

By Alan Ryall and John Birtill


Thumbnail of and link to report PDF (40.4 MB)Abstract

This technical letter contains a brief review of the operations which are involved in digital processing of array seismic recordings by the methods of velocity filtering, summation, cross-multiplication and integration, and by combinations of these operations (the “UK Method” and multiple correlation).

Examples are presented of analyses by the several techniques on array recordings which were obtained by the U.S. Geological Survey during chemical and nuclear explosions in the western United States.

Seismograms are synthesized using actual noise and Pn-signal recordings, such that the signal-to-noise ratio, onset time and velocity of the signal are predetermined for the synthetic record. These records are then analyzed by summation, cross-multiplication, multiple correlation and the UK technique, and the results are compared.

For all of the examples presented, analysis by the non-linear techniques of multiple correlation and cross-multiplication of the traces on an array recording are preferred to analyses by the linear operations involved in summation and the UK Method.

  • This report is available only on the Web.

For additional information:
Contact Information, Earthquake Science Center, Menlo Park Science Center
U.S. Geological Survey
345 Middlefield Road, MS 977
Menlo Park, California 94025

This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Ryall, A., and Birtill, J., 1962, Digital processing of array seismic recordings: U.S. Geological Survey Crustal Studies Technical Letter Number 2, 20 p. (Available at




Digital Processing of Array Recordings

Selected Results of Analysis


Accessibility FOIA Privacy Policies and Notices logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Contact USGS
Page Last Modified: Thursday, December 01, 2016, 12:27:42 PM