Unknown
Institute of Electrical and Electronics Engineers and Lawrence Livermore
National Lab. (Sponsor: Dep. of Energy, Washington, DC, contract: W-7405-ENG-48)
In:
Notes: IEEE workshop on neural networks for signal processing, Keihanna (Japan),
4-6 Sep 1996. Sponsored by Department of Energy, 51 pp., Washington, DC, and Livermore,
Institute of Electrical and Electronics Engineers and Lawrence Livermore National Lab.
(Sponsor: Dep. of Energy, Washington, DC, contract: W-7405-ENG-48), vol. C 560, 183 pp.,
no. UCRL-JC-123270, pp. 463-472, (ISBN 3-933346-037)
Publication Date:
1996
Description:
An earthquake warning system has been developed to provide a time series
profile from which vital parameters such as the time until strong shaking begins, the
intensity of the shaking, and the duration of the shaking, can be derived. Interaction
of different types of ground motion and changes in the elastic properties of geological
media throughout the propagation path result in a highly nonlinear function. We use
neural networks to model these nonlinearities and develop learning techniques for the
analysis of temporal precursors occurring in the emerging earthquake seismic signal. The
warning system is designed to analyze the first-arrival from the three components of an
earthquake signal and instantaneously provide a profile of impending ground motion, in
as little as 0.3 sec after first ground motion is felt at the sensors. The proposed
warning units can be used for site-specific applications, distributed networks, or to
enhance existing distributed networks. By producing accurate, and informative warnings,
the system has the potential to significantly minimize the hazards of catastrophic
ground motion. Detailed system design and performance issues, including error
measurement in a simple warning scenario are discussed in detail.
Keywords:
Seismology
;
Early warning systems (earthquakes, volcanic eruptions, tsunamis etc.)
;
Strong motions
;
Geology
;
geophysics
;
Electrotechnology
;
Structural
;
analyses
;
Earthquakes
;
Ground
;
Motion
;
Measuring
;
Instruments
;
Nuclear
;
Facilities
;
Real time earthquake monitoring
;
Real
;
Time
;
Systems
;
Accelerometers
;
Design
;
Detectors
;
Errors
;
Monitors
;
Neural
;
Networks
;
Safety
;
Seismographs
;
Wave propagation
;
Project report/description
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