Variability of site response in the Los Angeles urban area
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Abstract
This article addresses the variability of site response in the Los Angeles area and possible structural causes for the observations. Aftershock records from 231 sites in the San Fernando and Los Angeles basins and the surrounding mountains are used in this study. Spectral ratios, taken with respect to a low-amplitude reference site, are used to document the variation in site amplification in the frequency range 2 to 6 Hz, both spatially and with backazimuth to the source. At higher frequencies (6 to 10 Hz), spectral ratios are shown to have greater spatial variability. Interstation spectral ratios are used to measure the standard deviation among source as a function of station separation. An increase in the variation in ground motion is shown to take place at a station separation of 1 km. Relative site-response estimates between nearby stations are used to demonstrate that preferred directions of motion can exist even in areas with no surface topographic effects.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Variability of site response in the Los Angeles urban area |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/BSSA0870061377 |
| Volume | 87 |
| Issue | 6 |
| Year Published | 1997 |
| Language | English |
| Publisher | Seismological Society of America |
| Description | 24 p. |
| First page | 1377 |
| Last page | 1400 |
| Country | United States |
| State | California |
| City | Los Angeles |
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