Document Details


Title:
OPERATION HARDTACK - PROJECT 1.12, GROUND-SHOCK SPECTRA FROM SURFACE BURSTS (DELETED)
Subject Terms:
NUCLEAR EXPLOSIONS; CACTUS EVENT; KOA EVENT; HARDTACK I OPERATION; MEASURING INSTRUMENTS; PHYSICAL PROPERTIES; CALCULATION METHODS
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1960 Sep 15
Declassification Status:
Sanitized
Document Pages:
0033
Accession Number:
NV0051290
Originating Research Org.:
DEFENSE ATOMIC SUPPORT AGENCY, DOD
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
SELF-CONTAINED MECHANICAL REED GAGES, CAPABLE OF MEASURING THE DISPLAC EMENT-SHOCK SPECTRUM OVER A FREQUENCY RANGE OF 3 TO 300 CPS IN ANY ONE DIRECTION, WERE USED DURING SHOTS CACTUS AND KOA. CANISTERS CONTAINI NG THE GAGES WERE NORMALLY PLACED WITH THEIR TOPS FLUSH TO THE GROUND LEVEL AT PREDICTED PRESSURE LEVELS FROM 75 TO 200 POUNDS PER SQUARE IN CH ON BOTH SHOTS. ADDITIONAL GAGES WERE INSTALLED IN EARTH-CONFINED A RCH STRUCTURES OF PROJECT 3.2. SATISFACTORY RECORDS WERE OBTAINED FOR BOTH SHOTS. LIMITED COMPARISONS HAVE BEEN MADE BETWEEN THE RESULTS O BTAINED FOR THE LOW-YIELD (CACTUS) AND HIGH-YIELD (KOA) SHOTS AT THE E NIWETOK PROVING GROUND (EPG) AND BETWEEN THE RESULTS FOR SHOT CACTUS A ND THE LOW-YIELD SHOTS WHITNEY, GALILEO, AND SMOKY DURING OPERATION PL UMBBOB AT THE NEVADA TEST SITE (NTS). IN GENERAL, VERTICAL AND RADIAL DISPLACEMENTS FOR SHOT KOA WERE MUCH LOWER THAN EXPECTED FROM THE EXT RAPOLATION OF DATA OBTAINED FROM LOW-YIELD SHOTS DURING OPERATION PLUM BBOB. DIFFERENCES IN SOIL CONDITIONS, SURFACE VERSUS RAISED BURSTS, A ND TOPOGRAPHY VARIATIONS MAY HAVE BEEN CONTRIBUTING FACTORS. THE APPE NDIX CONTAINS THE PRELIMINARY RESULTS OF INTENSIVE PARAMETRIC ANALYSES AND THEORETICAL STUDIES BEING MADE IN AN ATTEMPT TO ESTABLISH SUITABL E SCALING LAWS. IN GENERAL, THE VERTICAL DISPLACEMENTS AT LOW FREQUEN CIES (LESS THAN 10 CPS) ARE LOWER AND THE DISPLACEMENTS AT HIGH FREQUE NCIES (GREATER THAN 100 CPS) ARE HIGHER FROM SHOTS CACTUS AND KOA THAN FROM THE SHOTS DURING OPERATION PLUMBBOB. ALSO, THE RATIOS BETWEEN R ADIAL AND VERTICAL COMPONENTS AT VARIOUS RANGES TEND TO BE MORE NEARLY EQUAL FOR THE TWO HARDTACK SHOTS THAN FOR THE PLUMBBOB SHOTS. SPECIF ICALLY, AT 110 PSI THE VERTICAL DISPLACEMENTS OF SHOT CACTUS WERE SIGN IFICANTLY LESS (ONE THIRD TO ONE FIFTH) THAN FOR THE PLUMBBOB SHOTS UP TO 20 CPS WHERE THEY ARE ALMOST EQUAL. ABOVE 50 CPS, THE VERTICAL DI SPLACEMENTS FOR SHOT CACTUS WERE TWO TO FOUR TIMES GREATER THAN FOR TH E PLUMBBOB SHOTS. THE RADIAL DISPLACEMENTS AT 110 PSI FOR SHOT CACTUS WERE ABOUT THE SAME AS FOR THE PLUMBBOB SHOTS UP TO 10 CPS AND TWO TO FOUR TIMES GREATER AT HIGHER FREQUENCIES. A COMPARISON OF THE VERTIC AL DISPLACEMENTS AT 90 PSI FOR CACTUS AND AT 84 PSI FOR KOA, SHOWS THA T THE DISPLACEMENTS FOR KOA WERE HIGHER IN THE LOW-FREQUENCY RANGE (TW ICE AS HIGH AT 3 CPS), LOWER FOR THE INTERMEDIATE-FREQUENCY RANGE (10 TO 50 CPS), AND ABOUT EQUAL FOR THE HIGH-FREQUENCY RANGE. THE RADIAL DISPLACEMENTS FOR CACTUS AT 90 PSI WERE ABOUT THE SAME AS FOR KOA AT 8 4 PSI, EXCEPT IN AN INTERMEDIATE-FREQUENCY RANGE (10 TO 50 CPS) WHERE THE CACTUS VALUES WERE FOUND TO BE GREATER.


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