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Southern California permanent GPS geodetic array: Error analysis of daily position estimates and site velocities by Jie Zhang; Yehuda Bock; Hadley Johnson; Peng Fang; Simon Williams; Joachim Genrich; Shimon Wdowinski; Jeff Behr is a Earth and Planetary Sciences article available to read on EtoBox.

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We analyze time series of daily positions estimated from data collected by 10 continuously monitoring Global Positioning System (GPS) sites in southern California during the 19‐month period between the June 28, 1992 (__M__~__w__~=7.3), Landers and January 17, 1994 (__M__~__w__~=6.7), Northridge earthquakes. Each time series exhibits a linear tectonic signal and significant colored noise. Spectral power at frequencies in the range 5 yr^−1^ to 0.5 d^−1^ is dominated by white noise or possibly fractal white noise and is several orders of magnitude higher than what would be expected from random walk noise (in this short‐period range) attributed by others to geodetic monument motions. Estimating a single slope for the time series' power spectra suggests fractal white noise processes with spectral indices of about 0.4. Site velocity uncertainties assuming this fractal white noise model are 2–4 times larger than uncertainties obtained assuming a purely white noise model. A combination white noise plus flicker noise (spectral index of 1) model also fits the data and suggests that the velocity uncertainties should be 3–6 times larger than for the white noise model. We cannot adequately dist

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Author

Jie Zhang; Yehuda Bock; Hadley Johnson; Peng Fang; Simon Williams; Joachim Genrich; Shimon Wdowinski; Jeff Behr

Publisher

American Geophysical Union (AGU)

Published

1997

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)