OSMS 91-14

by CSMIP Staff

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The processed data plots for Lexington Dam are presented in the following order for each earthquake:


The raw record for the first 22 seconds with all channels from a recorder shown on a single page.


Phase 1 (Vol. 1) data: uncorrected accelerations. Acceleration for the first 22 seconds is plotted with a common scaling factor for all channels; three channels are plotted on one page. This plot is followed by another plot of the full processed length (22 seconds) with each channel individually scaled.


Phase 2 (Vol. 2) data: instrument and baseline-corrected acceleration, velocity and displacement. The data for the full processed length are plotted with equal scaling for all channels. The filter bandwidth, determined during processing, is indicated on the plots.


Phase 3 (Vol. 3) data: response spectra. The pseudo-velocity spectra (PSV), the pseudo-acceleration spectra (PSA), the displacement spectra (SD), and the Fourier amplitude spectra (FS) are presented on a tripartite logarithmic plot for each channel. The spectra are plotted for periods within the filter bandwidth used in the Vol. 2 processing. In addition, the absolute acceleration spectra (SA) for 0%, 2%, 5%, 10%, and 20% dampings are plotted against period for periods from 0 to 2 seconds with linear-linear scaling.

Note:  a). Structure Reference Orientation N=0°.
          b). The three recorders are not interconnected to begin recording simultaneously.