€mma0sces000 Project 1.9 — Water Wave Studies - L. W. Kidd OBJECTIVES AND INSTRUMENTATION | Studies of water wave action generated by the detonation of large yield (greater than 1 MI) nuclear devices are made at relatively close ranges and at several distant island stations by Project 1.9. Four shore recording wave measuriggstations (of the Mark VIII type) were active in Pikini Lapoon Por eo (Blackfoot). — 2 In addition, Project 1.9 constructed 2nd installed founew type long period wave recorders on Eniwetok, Ailinginae, Wake, and Johnston Islands. These recorders are destene] to document long period, low amplitude decp ocean waves of the tsunami type. The recorders operate continuously but only receive significant signals from the large shots at Bikini. -~ = In ad- dition to the above instrumentation, a tide gage was active at Ailinginae Atoll, and Sandia Corporation microbarographic stations were operated by Project 1.9 at Wake and Johnston, ReSULTS The water wave stations were operating for this shot, but significant wave action was not observed, « COPiEr s+, Laeelo0e FANL Re . 4 ; - 13 - 0

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