Detection of crustal deformation from the Landers earthquake sequence using continuous geodetic measurements

Bock, Yehuda; Agnew, Duncan Carr; Fang, Peng; Genrich, J. F.; Hager, Bradford H.; Herring, Thomas A.; Hudnut, K. W.; King, Robert W.; Larsen, Shawn; Minster, J. B.; Stark, K.; Wdowinski, S.; Wyatt, Frank K.

doi:10.1038/361337a0

Cited by 114 publications

(58 citation statements)

References 17 publications

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“…the offset [Blewitt et al, 1993;Bock et al, 1993. For rate estimation, the original time series (with trend) is then corrected for this offset prior to estimating the final trend.…”

Section: Offset Estimation Strategymentioning

confidence: 99%

Offsets in Global Positioning System time series

2003

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[1] Site velocities are a common product of continuous Global Positioning System (CGPS) networks. Estimation of site velocities from their time series can be biased if offsets are present. If left uncorrected, offsets can dominate velocity uncertainties. Artificial (nontectonic) discontinuities may arise from environmental and equipment changes or human intervention and error. Analysis of present GPS data sets reveals that on a component by component basis, one offset occurs every 9 years, although it could be as frequent as one offset every 2 years. The effect offset estimation has on rate uncertainty depends on the noise characteristics in the series. If the noise is white, then estimating a single offset in the center of the series doubles the uncertainty. If the noise is random walk, then neither the position nor the number of offsets in the time series seriously alters the rate uncertainty. Undetected offsets in the time series mimic random walk noise. If an offset detection algorithm is implemented, then there is threshold size below which the algorithm can select the wrong offset epoch. Offset position uncertainty increases as offset size decreases. However, small offset position uncertainties will still result in lower rate uncertainties with respect to undetected offsets. Despite the appeal of estimating offsets by detrending and averaging data either side of the discontinuity, such a strategy only serves to increase the rate and offset uncertainties. The best strategy is still to use the maximum likelihood estimator to simultaneously estimate the linear parameters and the noise components.

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“…the offset [Blewitt et al, 1993;Bock et al, 1993. For rate estimation, the original time series (with trend) is then corrected for this offset prior to estimating the final trend.…”

Section: Offset Estimation Strategymentioning

confidence: 99%

Offsets in Global Positioning System time series

2003

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“…For continuous networks, these plots are typically supplemented by time series of position in order to assess the importance of timedependent or transient behavior (Bock et al 1993;Hudnut et al 2002). Thus far, regional transient motions have been revealed by plotting position time series from multiple sites on a common time axis.…”

Section: Introductionmentioning

confidence: 99%

Detecting Large-scale Intracontinental Slow-slip Events (SSEs) Using Geodograms

Wernicke¹,

Davis²

2010

Seismological Research Letters

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“…This backbone, together with the regional stations located in areas of tectonic activity, such as Japan and California, form a globalscale instrument capable of resolving global plate tectonic motions [114,115] and regional phenomena such as earthquake displacement [116,117]. As a result of this international cooperation, a culture of data sharing has developed, with data freely available for research purposes via the Internet from IGS Global Data Centers.…”

Section: Gps Infrastructure and Coopera-tionmentioning

confidence: 99%