Figure F24. Vertical component spectra from the seafloor, buried, and borehole installations at the Ocean Seismic Network site (OSN-1) are compared with the spectra from the buried installation at the Hawaii-2 Observatory (H2O) and from the Kipapa, Hawaii (KIP), Global Seismograph Network station on Oahu. The H2O site has extremely low noise levels above 5 Hz and near the microseism peak from 0.1 to 0.3 Hz. The H2O site has high noise levels below 50 mHz. Otherwise, the H2O levels are comparable to the OSN borehole and KIP levels. The sediment resonances at the H2O near 1.1 and 2.3 Hz are very prominent. Power spectral density is given in decibels (dB) relative to 1 (m/s2)2/Hz.

Figure F24. Vertical component spectra from the seafloor, buried, and borehole installations at the Ocean Seismic Network site (OSN-1) are compared with the spectra from the buried installation at the Hawaii-2 Observatory (H2O) and from the Kipapa, Hawaii (KIP), Global Seismograph Network station on Oahu. The H2O site has extremely low noise levels above 5 Hz and near the microseism peak from 0.1 to 0.3 Hz. The H2O site has high noise levels below 50 mHz. Otherwise, the H2O levels are comparable to the OSN borehole and KIP levels. The sediment resonances at the H2O near 1.1 and 2.3 Hz are very prominent. Power spectral density is given in decibels (dB) relative to 1 (m/s²)²/Hz.