Abstract
The goal of the Ocean Bottom Seismometer Augmentation of the Philippine Sea Experiment (OBSAPS) was to study the coherence and depth dependence of deep-water ambient noise, in the band from 0.03 - 80Hz, and signals, in the band from 50-400Hz. The cruise sailed Kaohsiung to Kaohsiung, April 29 to May 16, 2011. A fifteen element OBSAPS - Distributed Vertical Line Array (O-DVLA) with hydrophone modules from 12 to 852m above the seafloor was deployed in the Philippine Sea near 21degN, 126degE. Four short-period Ocean Bottom Seismometers (OBSs) and two long-period OBSs were deployed at 2km range from the O-DVLA. All of the OBSs had three-component inertial sensors and an acoustic pressure sensor. Three of the short period OBSs also had an external, autonomously recording hydrophone module identical to the hydrophone modules on the O-DVLA. The 12 day transmission program, using a J15-3 acoustic source, consisted of various M-sequences from 75.5 to 310Hz. Eight radial lines, a Star of David pattern, and nine station stops were transmitted out to 50km range. One radial line and nine more station stops were transmitted out to 250km range. Examples of possible Deep Seafloor Arrivals will be discussed. [Work supported by ONR.]
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