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Application of a Passive Surface Wave Method to Estimation of Deep S-wave Velocity Structure in San Francisco Bay Area
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2013 - 19th EAGE European Meeting of Environmental and Engineering Geophysics, Sep 2013, cp-354-00017
- ISBN: 978-90-73834-38-5
Abstract
We performed two-station microtremor array measurements (2ST-MAM) at several sites in the South Bay of the San Francisco Bay Area. Two seismographs with three-component accelerometers were used for data acquisition. The two accelerometers were separated by 5 to 4125m and several different separations were used at each site. The total record length of microtremor data for each separation was about 10 to 60 minutes and measurements at one site took several hours. A spatial autocorrelation was used for calculating phase velocity and clear dispersion curves were obtained in frequency range from 0.2 to 10 Hz. A joint inversion of dispersion curves and H/V spectra was applied to observed data and S-wave velocity models to a depth of about 2km were obtained.