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FIGURE CAPTIONS
Fig. 1 Trends in capabilities and cost of accelerogram digitization and data processing
systems.
Fig. 2 Hardware components of the automatic digitization and data processing system.
Fig. 3 Fourier spectra (dashed lines) and Response Spectra (solid lines) for damping £ 0 = 0, 0.02,
0.05, 0.10 and 0.20 (top to bottom), for records 45 seconds long (a-left) and 90 seconds long (bright).
Fig. 4 Comparison of different noise spectra associated with different recording instruments and
different methods of digitization (modified from Trifunac and Todorovska, 200Ib).
Fig. 5 Comparison of Fourier amplitude spectra of translation, X t with spectra of contribution
from fyg +0/ A , analog digitization noise, digital digitization noise (PDR), and microtremor and
microseism noise (redrawn from Trifunac and Todorovska, 200Ib).