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

Jang Tian Shieh, Yih Min Wu*, Li Zhao, Wei-An Chao, Chien Fu Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The use of characteristic period ťc and peak displacement amplitude Pd of the initial P wave in earthquake early warning (EEW) was proposed by Wu and Kanamori [1-4]. 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 38.4 cm/s at an epicentral distance of 14.5 km. According to our analysis, the peak displacement amplitude Pd is a better indicator for the destructiveness of an earthquake than ťc because ťc 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 0.5 cm (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.

Original languageEnglish
Pages (from-to)240-246
Number of pages7
JournalSoil Dynamics and Earthquake Engineering
Issue number2
StatePublished - 1 Feb 2011


  • Earthquake early warning
  • Strong-motion record
  • Taitung earthquake
  • Taiwan

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