Figure 16. Horizontal component spectra from the seafloor, buried, and borehole installations at OSN-1 are compared with the spectra from the buried installation at H2O and the KIP GSN station on Oahu. The sediment resonance peaks in the band 0.3-8 Hz are up to 35 dB louder than background and far exceed the microseism peak at 0.1-0.3 Hz. That the resonant peaks are considerably higher for horizontal components than for the vertical component is consistent with the notion that these are related to shear wave resonances (or Scholte modes).