Preliminary report on some factors affecting shotpoint efficiency
Crustal Studies Technical Letter
17
In cooperation with the Defense Advanced Research Projects Agency
By: W. H. Jackson and J. H. Healy
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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.
| 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 |
| DOI | 10.3133/70039542 |
| Year Published | 1964 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Denver, CO |
| Contributing office(s) | Earthquake Science Center |
| Description | v, 23 p. |
| Online Only (Y/N) | Y |
| Google Analytic Metrics | Metrics page |