Figure F5. Comparison of horizontal Guralp and geophone spectra for the same time interval (1300 hr) (high- and low-gain channels) in a window just before the gain change on JD360/2001. Because the gain change was applied to the vertical Guralp only it is not necessary to check the horizontal spectra after the gain change. Note that the low-gain channel data virtually masks the high-gain channel data. For each item listed, the first letter stands for geophone (E) or Gurlap (H), the second stands for high (H) or low (L) gain channels, and numbers in the third position indicate horizontal components.

Figure F5. Comparison of horizontal Guralp and geophone spectra for the same time interval (1300 hr) (high- and low-gain channels) in a window just before the gain change on JD360/2001. Because the gain change was applied to the vertical Guralp only it is not necessary to check the horizontal spectra after the gain change. Note that the low-gain channel data virtually masks the high-gain channel data. For each item listed, the first letter stands for geophone (E) or Guralp (H), the second stands for high (H) or low (L) gain channels, and numbers in the third position indicate horizontal components.