Figure F96. Spectra of the instrument ground and self-noise for the vertical and two horizontal components of each OBH deployed during Leg 195. The OBH self-noise curves were estimated by taking the incoherent power spectrum for ground-noise records of two adjacent OBHs deployed at Nokogiriyama vault in Chiba prefecture, Japan, on 30 January 2001. The increase of the 2-s period noise level is due to insufficient reduction of the large ground noise.

Figure F96. Spectra of the instrument ground and self-noise for the vertical and two horizontal components of each OBH deployed during Leg 195. The OBH self-noise curves were estimated by taking the incoherent power spectrum for ground-noise records of two adjacent OBHs deployed at Nokogiriyama vault in Chiba prefecture, Japan, on 30 January 2001. The increase of the 2-s period noise level is due to insufficient reduction of the large ground noise.