An examination of Tc -Pd earthquake early warning method using a strong-motion building array

The use of characteristic period Tc and peak displacement amplitude Pd of the initial P wave in earthquake early warning (EEW) was proposed by Wu and Kanamori. Here we apply this approach to strong-motion records from a building sensor array installed in Taitung County, Taiwan. This building was dam...

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Bibliographic Details
Published in:Soil dynamics and earthquake engineering (1984) 2011-02, Vol.31 (2), p.240-246
Main Authors: Shieh, Jang-Tian, Wu, Yih-Min, Zhao, Li, Chao, Wei-An, Wu, Chien-Fu
Format: Article
Language:English
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Summary:The use of characteristic period Tc and peak displacement amplitude Pd of the initial P wave in earthquake early warning (EEW) was proposed by Wu and Kanamori. Here we apply this approach to strong-motion records from a building sensor array installed in Taitung County, Taiwan. This building was damaged during the 2006 Mw =6.1 Taitung earthquake with a peak ground velocity (PGV) of up to 38.4cm/s at an epicentral distance of 14.5km. According to our analysis, the peak displacement amplitude Pd is a better indicator for the destructiveness of an earthquake than Tc because Tc is more sensitive to the signal-to-noise ratio (SNR) than Pd. In accordance with previous studies, only the structurally damaging Taitung earthquake generated a Pd value larger than 0.5cm (a threshold for identifying damaging events). Using Pd as an indicator for destructive earthquakes does not lead to missing or false alarms for EEW purposes.
ISSN:0267-7261
DOI:10.1016/j.soildyn.2009.12.015