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Preliminary report on some factors affecting shotpoint efficiency

Crustal Studies Technical Letter 17

In cooperation with the Defense Advanced Research Projects Agency
By:
and

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Abstract

A study of first-arrival amplitudes from 6 water shotpoints and 7 drill-hole shotpoints in parts of central and western United States indicate a variation of over 100 to 1 between the best and poorest shotpoints. Water shotpoints are, in general, superior to drill-hole shotpoints; however, one drill-hole shotpoint produced higher signal amplitudes than more than half of the water shotpoints. Signal amplitudes from drill-hole shotpoints varied by a factor of over 20. Saturated clay shooting medium appears to be the best shooting medium. Amplitudes from water shotpoints varied by a factor of about 10. Signal amplitude increases, in general, with water depth for bottom shots.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Unnumbered Series
Title:
Preliminary report on some factors affecting shotpoint efficiency
Series title:
Crustal Studies Technical Letter
Series number:
17
Year Published:
1964
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Denver, CO
Contributing office(s):
Earthquake Science Center
Description:
v, 23 p.
Number of Pages:
28
Online Only (Y/N):
Y