Estimation of shallow S-wave velocity structure in the Puli basin, Taiwan, using array measurements of microtremors

Cheng Feng Wu, Huey Chu Huang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The September 21, 1999, Chi-Chi earthquake induced strong shaking, resulting in severe damage in the Puli area. According to Huang and Tarng (2005), the collapse of many structures during the earthquake was very closely related to site effects. Shallow shear-wave velocities are widely used for earthquake ground-motion site characterization. Thus, we investigate 5-wave velocity structures for the Puli area by performing microtremor array measurements at 16 sites. Dispersion curves at these sites are calculated using the F-K method (Capon, 1969) for the vertical component; 5-wave velocity structures for the Puli area are then estimated by surface wave inversion (Herrmann, 1991). If the 5-wave velocity of the bedrock is assumed to be 2000 m/s, the depths of the Quaternary sediments in the Puli area are between 300 m (FAL, PIP) and 870 m (DAH). Moreover, there are 3∼6 distinct interfaces in the shallow velocity structure (0∼1000 m). The depth of the bedrock gradually increases from the edge (SIN, PIP) to the center (PUL, DAH) of the basin and the thickest Quaternary sediments appear near Heng-Chih-Cheng (DAH).

Original languageEnglish
Pages (from-to)389-403
Number of pages15
JournalEarth, Planets and Space
Volume64
Issue number5
DOIs
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

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