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Andreas response spectrum for the Foothills Landfill site because it controls over most <br />periods when compared to the CRCV spectrum. The difference between the two <br />spectra over the period range 0.03 to 2.0 seconds is not significant. <br />Three horizontal time histories were made spectrum compatible to the San Andreas <br />response spectrum shown in Figure 2. There are currently no empirical strong ground <br />motion recordings of a magnitude 8.0 earthquake at 135 km. Two of the reference time <br />histories were selected from the 1952 Kern County Earthquake (M=7.4). The third <br />reference time history was selected from a numerical simulation of ground motion. <br />Recently, the Southern California Earthquake Center conducted an exercise to predict <br />time histories from a magnitude 7.9 earthquake on the San Andreas fault at a distance <br />of 80 km. I have selected one of the simulated time histories (based on the Composite <br />Source Model of Anderson and Zheng) as a representative time history. <br />The recorded empirical time history (component 270) from the 1952 Kern County <br />earthquake from the Pasadena recording stations is shown in Figure 3. The response <br />spectrum of the modified time history is given in Figure 4 along with the San Andreas <br />target response spectrum. Finally, the modified acceleration, velocity, and <br />displacement time histories are shown in Figure 5. <br />The results using the reference time history from the Hollywood Storage station <br />(component 180) from the Kern County earthquake are shown in Figures 6-8. The <br />results using the synthetic reference time history are given in Figures 9-11. <br />11 <br />