S-Wave Velocity Structure of the Taiwan Chelungpu Fault Drilling Project (TCDP) Site Using Microtremor Array Measurements

Wu, Cheng Feng; Huang, Huey Chu

doi:10.1007/s00024-014-0773-3

Cited by 4 publications

(6 citation statements)

References 23 publications

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“…Wu et al [23] adopted geophysical well logs at depths between 500 and 1900 m to determine the physical properties of the fault zone and its neighboring damage areas. The well-logging data provided Wu and Huang [11] a suitable reference for inspecting the validity of the inverted velocity structures by using microtremor array measurements. Therefore, they conducted microtremor array measurements at two sites (DAK and TCD) close to the TCDP-A sites (Figure 2).…”

Section: Examination Of Analysis Methodsmentioning

confidence: 99%

“…Therefore, they conducted microtremor array measurements at two sites (DAK and TCD) close to the TCDP-A sites (Figure 2). In this study, the analysis methods and techniques used closely resembled those in [11]; thus we include Figure 4 (adopted from [11]) to certify that our inversion results (in Section 4) are reliable. In the figure, the S-wave velocity estimated from the differential inversion technique [22] gradually increases from 1.52 km/s at the depth of 585 m to 2.22 km/s at the depth of 1710 m. This velocity structure is similar to that from the well-logging data, which ranged from 1.4 km/s at the depth of 597 m to 2.98 km/s at the depth of 1705 m. This figure also displays the depth function (blue line) of the S-wave velocity, which is the regression result of the TCDP well-logging data at depths between 494 m and 1707 m in [24].…”

Section: Examination Of Analysis Methodsmentioning

confidence: 99%

“…In terms of economical and practical considerations, microtremor array measurements provide a favorable alternative in estimating S-wave velocity structures. Many studies have employed microtremor array measurements to examine material properties [3][4][5][6][7][8][9][10][11][12][13][14]. Singh et al [15] estimated the site characteristics of different geological formations in the Kachchh seismic zone of western India by conducting microtremor array measurements at 7 sites and single-station microtremor measurements at 36 sites.…”

Section: Introductionmentioning

confidence: 99%

“…Fifty-three microtremor array sites (triangles) superimposed on a geological map of the Taichung area (reconstructed from Central Geology Survey [2]). The TCDP-A well-logging site (circle) and two microtremor array sites (TCD and DAK) used in Wu and Huang[11] are also marked. Array sites were divided into four groups according to the amplitudes and shapes of the dispersion curves; brown, blue, pink, and green triangles denote Groups 1, 2, 3, and 4, respectively.…”

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confidence: 99%

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Estimation of Shear-Wave Velocity Structures in Taichung, Taiwan, Using Array Measurements of Microtremors

et al. 2021

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Near-surface S-wave velocity structures (VS) are crucial in site-effect studies and ground-motion simulations or predictions. We explored S-wave velocity structures in Taichung, the second-largest city in Taiwan by population, by employing array measurements of microtremors at a total of 53 sites. First, the fundamental-mode dispersion curves of Rayleigh waves were estimated by adopting the frequency–wavenumber analysis method. Second, the surface-wave inversion technique was used to calculate the S-wave velocity structures of the area. At many sites, observed phase velocities were almost flat, with a phase velocity of approximately 800–1300 m/s in the frequency range of 0.6–2 Hz. A high-velocity zone (VS of 900–1500 m/s) with a convex shape was observed at the shallow S-wave structures of these sites (depths of 50–500 m). On the basis of the inversion results, we constructed two-dimensional and three-dimensional contour maps to elucidate the variations of VS structures in Taichung. According to VS-contour maps at different depths, lowest S-wave velocities are found at the western coastal plain, whereas highest S-wave velocities appear on the eastern side. The S-wave velocity gradually decreases from east to west. Moreover, the S-wave velocity of the Tertiary bedrock is assumed to be 1500 m/s in the area. According to the depth-contour map (VS = 1500 m/s), the depths of the bedrock range from 250 m (the eastern part) to 1550 m (the western part). The thicknesses of the alluvium gradually decrease from west to east. Our results are consistent with the geology of the Taichung area.

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Section: Examination Of Analysis Methodsmentioning

confidence: 99%

Section: Examination Of Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Estimation of Shear-Wave Velocity Structures in Taichung, Taiwan, Using Array Measurements of Microtremors

et al. 2021

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“…These results were also in good agreement with the geological and geophysical information on the area. Similarly, Wu and Huang (2014) studied the S-wave velocity structure (0-3500 m) of the Taiwan Chelungpu Fault Drilling Project (TCDP) site using microtremor array measurement. The inversion results are similar to those from seismic reflection methods and the lithostratigraphy of the TCDP-A borehole.…”

Section: Introductionmentioning

confidence: 99%

S-wave velocity structures of the Taipei Basin, Taiwan, using microtremor array measurements

Huang

Lee

et al. 2015

Journal of Asian Earth Sciences

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Estimating Four-Dimensional Internal Wave Spectrum in the Northern South China Sea

Sun

Zhao

Yang

et al. 2019

Journal of Atmospheric and Oceanic Technology

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Internal waves can transfer energy from large-scale to microscale processes; however, the spectra of these waves remain poorly known. A method that combines modal harmonic decomposition and maximum-likelihood method is proposed in this study to estimate four-dimensional internal wave spectrum using limited mooring observations. Using this method, a four-dimensional internal wave spectrum was obtained for the first time based on the mooring measurements collected during the South China Sea (SCS) Internal Wave Experiment in July 2014. The spectrum was then validated by comparing with the spectrum based on Fourier analysis and with the modified Garrett–Munk internal wave spectrum, respectively. The power of the internal wave spectrum decreased obviously with increasing frequency and wavenumber, with a falloff rate of ω−2 beyond tidal frequencies, and with falloff rates of [Formula: see text] and [Formula: see text] for horizontal and vertical wavenumbers, respectively. In addition, at a fixed frequency and vertical wavenumber, the propagation direction and phase speed of internal waves can be obtained through the four-dimensional spectrum. In summary, we verified the feasibility of estimating four-dimensional internal wave spectrum using limited mooring observations in this study, and the method we proposed should be applicable to other regions where such mooring observations are available.

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S-Wave Velocity Structure of the Taiwan Chelungpu Fault Drilling Project (TCDP) Site Using Microtremor Array Measurements

Cited by 4 publications

References 23 publications

Estimation of Shear-Wave Velocity Structures in Taichung, Taiwan, Using Array Measurements of Microtremors

Estimation of Shear-Wave Velocity Structures in Taichung, Taiwan, Using Array Measurements of Microtremors

S-wave velocity structures of the Taipei Basin, Taiwan, using microtremor array measurements

Estimating Four-Dimensional Internal Wave Spectrum in the Northern South China Sea

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