NEHRP Clearinghouse
- Title
- Microzonation by Amplification Ratio Technique.
- File
- PB80151913.pdf
- Author(s)
- Sherif, M. A.; Ishibashi, I.; Kearnes, J. K.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., May 1976, 161 p.
- Identifying Number(s)
- SOIL ENGINEERING RESEARCH-13
- Abstract
- The seismic behavior of the Satsop nuclear reactor site is investigated by the ratio microzonation method which involves simultaneous observations of microseismic signals at two stations with identical recording seismometers and utilization of the ratio of power spectra to identify ground amplification and frequency distribution. The study reveals the following: (1) Microseismic power spectra are nonstationary within the time constraints of this study; (2) Even though the amplification spectra are not stationary in the strict sense of the word, they do appear to be consistently more stationary than the corresponding power spectral ratio, and (3) There is a good correlation between the resonant site frequencies determined by microseismic amplification spectra and those calculated from field shear wave velocity measurements. Description, discussion and analysis of the study area, data collection, and processing comprise the bulk of this report. A large portion of material is presented in tabular and graphic form.
- Keywords
- Microseisms; Satsop (Washington); Seismic waves; Nuclear reactor sites; Geological surveys; Nuclear reactor safety; Earthquake engineering; Site surveys; Data processing; Washington (State); Power spectra; Microzonation