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A three-axis seismometer was deployed at a depth of 6 m in a mud sediment by first making a 20-cm-diam hole in the bottom, using a bottom-mounted “drilling” machine, inserting the seismometer, and then removing all machine components, allowing sediment to cave in around the sensor. An identical seismometer was deployed on the sediment/water interface. Data were acquired with both ambient noise and explosive shot sources detonated on the bottom as a function of range to 3 km in a water column 16 m deep. While the bottomed seismometer data showed the existence of Sholte-type interface waves present on both horizontal (radial) and vertical geophones, the subbottom seismometer data show signals predominantly on the vertical geophone. The results are analyzed and modeled with the SAFARI code.

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