F e d e r a t i o n The Ocean Acoustic Observatory Federation (OAOF) includes several laboratories and universities: the Institute of Geophysics and Planetary Physics (IGPP) and the Marine Physical Laboratory (MPL) at the Scripps Institution of Oceanography, the Pacific Meteorological and Environmental Laboratory (PMEL) of NOAA, the Naval Postgraduate School (NPS), and the Applied Physics Laboratory at the University of Washington (UW/APL). The OAOF integrates the previously independent activities of its member institutions in the collection of long time series from acoustic arrays in the Pacific. The funded activities include the outfitting and operation of retired Sound Surveillance System (SOSUS) stations, research in earthquake and volcano seismicity, the monitoring of marine mammal behavior, the use of acoustic methods for ocean acoustic tomography and thermometry, and the development of a fundamental understanding of the coupling of elastic waves from volcanoes and earthquakes into the ocean sound channel. During the course of the NOPP-funded grant, we intend to install, operate and maintain high-quality recording systems at SOSUS arrays at Pt. Sur, Barbers Point, and San Nicolas. While the arrays have been in operation for decades, there is no legacy from the SOSUS systems in the form of long time series of ocean signals and noise. The OAOF will initiate and maintain records which are of great scientific interest now and well into the future. We are exploiting the data under current Navy guidelines for data classification and Figure 1: The SOSUS cable at Pt. Sur with the central conductor and various insulators and shields exposed.