Investigation of T-wave propagation in the offshore area east of Taiwan from early analog seismic network observations

Bor Shouh Huang, Po Fei Chen, Yi Ling Huang, Win Gee Huang, Chun Chi Liu

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2 Scopus citations


Extant paper records of the early analog seismic network of Taiwan represent a large resource for earthquake studies in several disciplines. In this study, we report on T waves generated from offshore earthquakes, based on analog observations. The T phases were identified from their stable apparent velocity of about 1.5 km s-1 and other observations using data recorded by stations in eastern Taiwan and on two nearby islands. The observed T phases are recorded for the first time from Taiwan, and in particular are observed by the network in the distal range of local earthquakes. Most of the T waves are observed at island stations at epicentral distances greater than 100 km. For earthquakes that occurred a great distance east of Taiwan, the T phases are always the most dominant phases observed at island stations east of Taiwan, and are also seen at some inland stations with smaller amplitudes. No T phases from inland events were observed by stations on Taiwan or on nearby islands. The observations indicate that the amplitude of the T phase is highly attenuated on its land path and that the propagation direction of the T phase is affected by water depth.

Original languageEnglish
Pages (from-to)383-391
Number of pages9
JournalTerrestrial, Atmospheric and Oceanic Sciences
Issue number4
StatePublished - Aug 2011


  • Analog records
  • Earthquake
  • Propagation
  • T-wave
  • Taiwan


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