Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; October 1970; v. 60; no. 5; p. 1417-1424
© 1970 Seismological Society of America
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A wide-band digital seismograph system

M. D. BURKE, E. R. KANASEWICH, J. D. MALINSKY and J. F. MONTALBETTI

SEISMOLOGY DIVISION DEPARTMENT OF PHYSICS UNIVERSITY OF ALBERTA, EDMONTON, Canada

Abstract

A three-component, broad-band seismic system which records directly onto seven-track digital tape is described. A novel approach of synthesizing a desired response by a differential filtering and summing technic using low-noise operational amplifiers is demonstrated. As an example, the usable velocity sensitivity of a Willmore Mark II seismometer having a natural period of 1.5 sec is extended out to about 40 sec under normal operating conditions. Seismic energy over a wide spectrum may thus be recorded.




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E. R. KANASEWICH, W. P. SIEWERT, M. D. BURKE, C. H. MCCLOUGHAN, and L. RAMSDELL
Gain-ranging analog or digital seismic system
Bulletin of the Seismological Society of America, February 1, 1974; 64(1): 103 - 113.
[Abstract] [PDF]


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