Surface waves of the 2011 Tohoku earthquake: Observations of Taiwan's dense high-rate GPS network

Huang Kai Hung, Ruey Juin Rau

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Surface waves generated by the 2011 Mw 9.0 Tohoku, Japan earthquake were recorded by both the high-rate GPS and broadband seismic stations in Taiwan. In this study, we investigate the precision of high-rate GPS displacements and estimate the feasibility of using GPS for seismology study in Taiwan. One hertz observations of 210 continuous GPS stations in Taiwan and neighboring islands were processed using a precise point positioning technique to estimate the absolute epoch-by-epoch positions generated by the Tohoku earthquake. Modified sidereal filtering was used to correct for near-daily periodical variations of high-rate position time series that may be influenced by multipath effects, and a band-pass filter was used to remove noises from marginal frequencies. For all the 210 stations, the GPS precision after modified sidereal filtering improved from 8.2 to 7.4 mm in the horizontal and from 19.5 to 12.7 mm in the vertical components except for about 20% of the data with large position errors. After applying the band-pass filter in the teleseismic frequency band (0.008-0.08 Hz), excluding 54 stations with noisy data, 156 continuous GPS stations were selected. Surface wave displacements derived from both high-rate GPS and broadband seismometers are highly consistent, and the correlation coefficients are enhanced by a band-pass filter (0.008-0.08 Hz) from 0.85 to 0.95 in the horizontal and from 0.58 to 0.85 in the vertical components. We consider continuous GPS can be used as an alternative approach to study characteristics of surface wave propagation in Taiwan. Surface waves generated by Tohoku EQ were recorded by high-rate GPS in Taiwan We investigate precision of high-rate GPS and feasibility of GPS for seismology The dense CGPS array in Taiwan enhances specific seismic features more detail

Original languageEnglish
Pages (from-to)332-345
Number of pages14
JournalJournal of Geophysical Research: Solid Earth
Volume118
Issue number1
DOIs
Publication statusPublished - 2013 Jan 1

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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