The Hawaii-2 Observatory (H2O; was established on the seafloor between Hawaii and California (Figure 1) in 1998 using the retired AT&T Hawaii-2 undersea telephone cable for power and telemetry (Butler et al., 2000; Duennebier et al., 2002; Harris and Duennebier, 2002; Pettit et al., 2002). This is the first undersea seismic station in the Global Seismographic Network. The on-site instrumentation includes a broadband Guralp CMG-3 and 4.5 Hz Geospace HS1 geophones, buried 0.5 m into the sea-floor mud, and an OAS E2PD hydrophone 0.5 m above the seafloor. All...

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