Comparison and Revision of the Earthquake Early Warning Methods for Different Regional Seismic Data


Abstract eng:
Earthquake early warning (EEW) system is one of the most useful tools to mitigate seismic hazards. Although EEW methods have already been developed worldwide, the applicability of these processes in China is still unclear. Therefore, we tested and compared these methods by applying them to the seismic data recorded at the western area of China and attempted to provide a revised model for the earthquake early warning. The adopted data herein mainly consisted of the main-shock and aftershocks of the 2008 Ms 8.0 Wenchuan earthquake, where hundreds of three-component acceleration waveforms were treated to investigate the early warning theories. For the purpose of an EEW, reliable techniques for automatic seismic phases’ identification are essential for the subsequent real-time analysis, thus we combined the short-term and long-term average ratio (STA/LTA CF) detector with the AIC function of higher order statistics to lock on the phase with a higher accuracy. Because the estimation of the event magnitude is the central objective of EEW, comparison and selection of the parameters including the average ground motion period τc and the cumulative absolute velocity (CAV) were investigated according to their performance as magnitude estimators. Then we established the regression relationship using our dataset and the impacts of the geological conditions and earthquake occurrence environments on the earthquake early warning were also studied.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


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