oun Project 1.9 - Water Wave Studies - L. W. Kidd OBJECTIVES AND INSTRUMENTATION Studies of water wave action generated by the detonation of large yield nr ‘ nuclear devices are made at relatively close ranges and at several distant island stations by Project 1.9. Four shore recording wave measuring stations (of the Mark VIII type) were active in Bikini Lagoon for RY o220) shot. In addition, Project 1.9 constructed end installed four new type long period wave recorders on Eniwetok, Ailinginae, Wake, and Johnston Islands, These recorders are designed to document long period, low amplitude deep ocean waves of the tsunami type. The recorders operate continuously but cnly receive significant signals from the large shots. In addition to the above instrumentation, a tide page was active at Ailinginae Atoll, and Sendia Corporation microbarogrephic stations were operated by Project 1.9 at Wake and Jolknston,. RESULTS The lagoon and deep water long period recorders did not detect water wave action Ivine . " we - 18 «