Charles Harold Greer

US Patent:

45546487, Nov 19, 1985

Filed:

Aug 18, 1982

Appl. No.:

6/409251

Inventors:

Charles B. Greer - Lenoir NC
Donald W. Keehan - Fairfax VA
John A. Springer - Alexandria VA

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

G01V 100
H04B 1100

US Classification:

367 49

Abstract:

A novel method for electronically determining the gross characteristics of he top layer of the earth's crust at a given location by using a passive seismic transducer as a sensing device for sensing background seismic noise in conjunction with as assembly of generally conventional miniature low power electronic components arranged in a system containing analog and logic circuits with a read-out meter calibrated to represent the detected background noise as seismic resonant frequency. The electronic determination of the crust character is in lieu of various conventional soil refractometry tests which are lengthy time-consuming procedures. The seismic resonant frequency has been found to be representative of the thickness and of the property or character of the crust at that particular geographical location. More specifically, this novel electronic method with related apparatus further is uniquely applicable to determine the crust's character and thus the effect thereof on seismic performance of any seismic sensor device to be used thereat to sense potential various encroaching traffic activity within a selective predeterminable range.