In our previous work we investigated teleseismic, local, and microseism data recorded by the 41-station seismic array in the Santa Clara Valley (SCV) (Figure 13.15). We have found strong correlations between basin depth reported in the USGS 3D seismic velocity model (ver. 2) (Jachens et al., 1997) and different relative measures of ground motion parameters such as teleseismic arrival delays, P-wave amplitudes, wave energy, local earthquake S-wave amplitudes, and periods of microseism horizontal to vertical spectral ratio peaks (Dolenc et al., 2005; Dolenc and Dreger, 2005). The teleseismic, local earthquake, and microseism observations were also found to be strongly correlated with one another. The results suggested that all three datasets are sensitive to the basin structure (Figure 13.16) and could therefore be used together to improve the 3D velocity model.
Berkeley Seismological Laboratory
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