Introduction

The long-period background noise observed at ocean bottom seismic stations is mainly due to deformation of the seafloor under the pressure forcing by long-period ocean surface gravity waves (infragravity waves; 0.002 to 0.05 Hz). Understanding the nature and characteristics of the coupling between infragravity waves and the solid earth is important for the study of infragravity wave generation and dissipation as well as for the study of the earth's hum and structure using non-seismic sources.

Station KEBB was installed 247 km offshore Vancouver Island at a water depth of 2376 m in August 2003 in collaboration between the University of Washington (UW), the University of Oregon, and the Monterey Bay Aquarium Research Institute (MBARI) as part of a three-year multidisciplinary experiment to monitor the linkages between the seismic deformation and hydrothermal fluxes on the northern Juan de Fuca plate. KEBB comprises a three-component broadband seismometer Guralp CMG-1T, sensitive over a wide frequency range, from 50 Hz to 2.8 mHz (360 sec), a recording, and a battery package. The seismometer is completely buried in the ocean floor sediments. The station is continuously recording data which were retrieved in August 2004 and September 2005.

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