Identification of non-linear and non-stationary soil properties during the 1995 Hyogoken-nanbu earthquake

An extended Kalman filter algorithm with local iteration is presented for the identification of non-linear and non-stationary soil properties. Borehole-array strong motions were recorded at a liquefied site during the 1995 Hyogoken-nanbu earthquake. In this study, a modified Kalman filtering method...

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Bibliographic Details
Published in:Soil dynamics and earthquake engineering (1984) 2003-06, Vol.23 (4), p.279-286
Main Authors: Mikami, A., Sawada, T., Ekawa, T.
Format: Article
Language:English
Subjects:
Borehole array
Earth sciences
Earth, ocean, space
Earthquakes, seismology
Engineering and environment geology. Geothermics
Exact sciences and technology
Extended kalman filter
Hyogoken-nanbu earthquake
Internal geophysics
Iteration
Liquefaction
Natural hazards: prediction, damages, etc
Non-linear
Non-stationary
System identification
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Summary:An extended Kalman filter algorithm with local iteration is presented for the identification of non-linear and non-stationary soil properties. Borehole-array strong motions were recorded at a liquefied site during the 1995 Hyogoken-nanbu earthquake. In this study, a modified Kalman filtering method in which the extended Kalman filter is iteratively used at every local time-step to track rapid parameter changes is proposed. The method is then applied to the instrumented soil layer, which is modeled by an equivalent linear model. An identification of non-linear and non-stationary soil properties was conducted successfully; and non-linear restoring force–displacement relationships including progression with time were obtained.
ISSN:0267-7261
1879-341X
DOI:10.1016/S0267-7261(03)00002-2