UNCLASSIFIED SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) READ INSTRUCTIONS BEFORE COMPLETING FORM REPORT DOCUMENTATION PAGE 1. REPORT NUMBER 2. GOVT ACCESSION NO.) 3. RECIPIENT'S CATALOG NUMBER 8S. TYPE OF REPORT &@ PERIOD COVERED . 6. PERFORMING ORG, 6. CONTRACT OR GRANT NUMBER(8) WT-9002 (EX) 4. TITLE (and Subtitte) . General Report on Weapons Tests Ground-Motion Studies on Operations IVY and CASTLE 7. AUTHOR(s) Wr-9002 (EX) REPORT NUMBER W. R. Perret 9. PERFORMING ORGANIZATION NAME ANO ADORESS Sandia Corporation 10. PROGRAM ELEMENT. PROJECT, TASK 12. REPORT DATE AREA & WORK UNIT NUMBERS Albuquerque, New Mexico 14. CONTROLLING OFFICE NAME ANO AOORESS 13. P18, MONITORING AGENCY NAME @ ADDRESS(if different from Controlling Otlice) February 1955 tS. NUMBER OF PAGES SECURITY CLASS. (of thie report) UNCLASSIFIED 1Sa. 16. . DECLASSIFIC ATION/ DOWNGRADING SCHEDULE OISTRIGUTIONM STATEMENT (of this Report) Approved for public release; unlimited distribution. 17. 18. 19. DISTRIBUTION STATEMENT (af the ebstract entered in Block 20, if different trom Report) SUPPLEMENTARY NOTES . This report has had the classified information removed and has been republished in unclassified form for public release. This work was performed by Kaman Tempo under contract DNAO01-79-C-0455 with the close cooperation of the Classification Management Division of the Defense Nuclear Agency. KEY WORDS (Continue on reverse side if necessary and identify by block number) Operation IVY Operation CASTLE Ground-Motion Studies 20. ABSTRACT (Continues on reverse side ti necessary and identity by block number) Ground motion produced by Mike shot of Operation Ivy (Project 6.5) was measured as three components of acceleration at four ground ranges between 8000 and 114,000 ft. Gauges were in sand below the water table at depths of about 17 ft. Similar measurements were made on a massive concrete instrument shelter at about 30,000 ft from Ground Zero. Ground-motion data derived from shot 3 of Operation Castle (Project 1.7) are presented in Chap. 2. These data, because of the low yield of the shot, are inadequate for correlation with the results of other tests. DD ony: 1473 EDITION OF | wov 6815 OBSOLETE UNCLASSIFIED SECURITY CLASSIFICATION OF THIS PAGE (When Dota Entered)