Instrumentation Corrections to Wave Velocity Data

by John R. Hall, Jr., (M.ASCE), Sr. Consulting Engr.; Stone & Webster Engrg. Corp., Boston, Mass.,
James L. Wolfgang, Geologist; Stone & Webster Engrg. Corp., Boston, Mass.,
Eduardo Kausel, (A.M.ASCE), Assoc. Prof. of Civ. Engrg.; Massachusetts Inst. of Tech., Cambridge, Mass.,
John T. Christian, (F.ASCE), Sr. Consulting Engr.; Stone & Webster Engrg. Corp., Boston, Mass.,


Serial Information: Journal of the Geotechnical Engineering Division, 1981, Vol. 107, Issue 10, Pg. 1419-1423


Document Type: Journal Paper

Abstract: The detection of the arrival of seismic stress waves for a field measurement of wave velocity requires that the incoming signal be recorded and displayed by an instrument such as a seismograph. Filters, introduced into recording circuits to limit noise or to prevent aliasing in digital recording, can have significant effects on the observed arrival times and on the computation of wave velocity. Such filtration is often not taken into account in processing the data, but the example that follows indicates how the effects can be evaluated and the data corrected by simple techniques. The properties of electronic filters are, of course, well known to electrical engineers, and the following comments are concerned with an application in which their importance has not always been appreciated by those trained in other disciplines.

Subject Headings: Wave velocity | Seismic waves | Stress waves | Wave measurement | Data processing | Seismic tests | Filters | Travel time

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