LINDAHL, J. M.
Most widely held works by J. M LINDAHL
GROUND-SHOCK SPECTRA FROM SURFACE BURSTS ( Book )
1 edition published in 1960 in English and held by 1 library worldwide
Self-contained mechanical reed gages, capable of measuring the displacement-shock spectrum over a frequency range of 3 to 300 cps in any one direction, were used during Shots Cactus and Koa. Canisters containing the gages were normally placed with their tops flush to the ground level at predicted pressure levels from 75 to 200 psi on both shots. Additional gages were installed in earth-confined arch structures of Project 3.2. Satisfactory records were obtained for both shots. Limited comparisons have been made between the results obtained for the low-yield (Cactus) and high-yield (Koa) shots at the Eniwetok Proving Ground (EPG) and between the results for Shot Cactus and the lowyield Shots Whitney, Galileo, and Smoky during Operation Plumbbob at the Nevada Test Site (NTS). In general, vertical and radial displacements for Shot Koa were much lower than expected from the extrapolation of data obtained from low-yield shots during Operation Plumbbob. Differences in soil conditions, surface versus raised bursts, and topography variations may have been contributing factors. The Appendix contains the preliminary results of intensive parametric analyses and theoretical studies being made in an attempt to establish suitable scaling laws. (Author).
SHOCK SPECTRUM MEASUREMENTS ( Book )
1 edition published in 1962 in English and held by 1 library worldwide
Twelve reed gages were installed for horizontal and vertical displacement shock spectrum measurements on the GNOME event. Seven of the 12 reed gages were placed on the earth's surface at various ranges from surface zero. Four of the gages were placed in the GNOME tunnel. One gage was placed in the International MineralsAND Chemical Corporation Mine (Shaft No. 4) approximately nine miles from the GNOME site. Usable data were obtained from nine of the 10 records recovered to date. The gage in the IMC mine recorded no displacements. Records from the gages in tunnel nearest zero were not recovered. (Author).