Effect of surface geology on ground motions: The case of station TAP056 - Chutzuhu Site

Kuo Liang Wen, Che Min Lin, Hsien Jen Chiang, Chun Hsiang Kuo, Yu Chih Huang, Hsin Chieh Pu

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6 Scopus citations


In the Tatun mountain area of northern Taiwan are two strong motion stations approximately 2.5 km apart, TAP056 and TAP066 of the TSMIP network. The accelerometer at station TAP056 is often triggered by earthquakes, but that at TAP066 station is not. Comparisons of vertical and horizontal peak ground accelerations reveal PGA in the vertical, east-west, and north-south components at TAP056 station to be 3.89, 7.57, and 5.45 times those at station TAP066, respectively. The PGA ratio does not seem to be related to earthquake source or path. Fourier spectra of earthquake records at station TAP056 always have approximately the same dominant frequency; however, those at station TAP066 are different due to different sources and paths of different events. This shows that spectra at TAP056 station are mainly controlled by local site effects. The spectral ratios of TAP056/TAP066 show the S-wave is amplified at around 8-10 Hz. The horizontal/vertical spectral ratios of station TAP056 also show a dominant frequency at about 6 and 8-10 Hz. After dense microtremor surveying and the addition of one accelerometer just 20 meters away from the original observation station, we can confirm that the top soft soil layer upon which the observation station is constructed generates the local site response at station TAP056.

Original languageEnglish
Pages (from-to)451-462
Number of pages12
JournalTerrestrial, Atmospheric and Oceanic Sciences
Issue number5
StatePublished - Oct 2008


  • Local site effect
  • Microtremor survey
  • Peak ground acceleration
  • Spectral ratio


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