High‐Resolution 3‐D Shear Wave Velocity Model of Northern Taiwan via Bayesian Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity With Formosa Array

Liu, Cheng-Nan; Lin, Fan‐Chi; Huang, Hsin‐Hua; Wang, Yu; Berg, Elizabeth; Lin, Ching‐Ren

doi:10.1029/2020jb021610

Cited by 6 publications

(5 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A plane wave propagating in the great circle direction is assumed when calculating the shift time (Y. Wang, Allam, & Lin, 2019; Y. Wang, Lin, & Ward, 2019). To satisfy the far‐field approximation, we only include cross‐correlations with a distance larger than one wavelength (Liu et al., 2021), where the wavelength is estimated using a reference velocity of 4 km/s. While a stricter far‐field criterion is sometimes desirable (e.g., three wavelengths; Lin et al., 2008), the one wavelength criterion used in this study is empirically determined to balance the number of measurements and the measurement uncertainty.…”

Section: Methodsmentioning

confidence: 99%

“…We jointly invert Rayleigh wave phase dispersion and H / V ratio measurements at each location using a 1‐D Markov Chain Monte Carlo (MCMC) method to resolve shear wave velocity ( V s ) structure in the crust (Figure 7; Berg et al., 2020; Liu et al., 2021; Shen & Ritzwoller, 2016). The complementary sensitivity of Rayleigh wave phase velocities and H / V ratios (Figure 8) allows the crustal structure to be resolved from the surface to 16 km.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The Crustal Magmatic Structure Beneath the Denali Volcanic Gap Imaged by a Dense Linear Seismic Array

Rabade,

Lin,

Tape

et al. 2023

JGR Solid Earth

Self Cite

View full text Add to dashboard Cite

The crustal structure in south‐central Alaska has been influenced by terrane accretion, flat slab subduction, and a modern strike‐slip fault system. Within the active subduction system, the presence of the Denali Volcanic Gap (DVG), a ∼400 km region separating the active volcanism of the Aleutian Arc to the west and the Wrangell volcanoes to the east, remains enigmatic. To better understand the regional tectonics and the nature of the volcanic gap, we deployed a month‐long north‐south linear geophone array of 306 stations with an interstation distance of 1 km across the Alaska Range. By calculating multi‐component noise cross‐correlation and jointly inverting Rayleigh wave phase velocity and ellipticity across the array, we construct a 2‐D shear wave velocity model along the transect down to ∼16 km depth. In the shallow crust, we observe low‐velocity structures associated with sedimentary basins and image the Denali fault as a narrow localized low‐velocity anomaly extending to at least 12 km depth. About 12 km, below the fold and thrust fault system in the northern flank of the Alaska Range, we observe a prominent low‐velocity zone with more than 15% velocity reduction. Our velocity model is consistent with known geological features and reveals a previously unknown low‐velocity zone that we interpret as a magmatic feature. Based on this feature's spatial relationship to the Buzzard Creek and Jumbo Dome volcanoes and the location above the subducting Pacific Plate, we interpret the low‐velocity zone as a previously unknown subduction‐related crustal magma reservoir located beneath the DVG.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The Crustal Magmatic Structure Beneath the Denali Volcanic Gap Imaged by a Dense Linear Seismic Array

Rabade,

Lin,

Tape

et al. 2023

JGR Solid Earth

Self Cite

View full text Add to dashboard Cite

show abstract

“…Conversely, a smaller C value indicates a lower overall Q value, suggesting that the predominant medium in the region is likely composed of softer materials. In this study, we compared our attenuation model with the latest P -wave 12 and S -wave 3-D velocity models 34 in northern Taiwan (Fig. 5 ) for three layers at depths of 0–5 km, 6–10 km, and 11–15 km.…”

Section: Lateral Variations Of Attenuation In Northern Taiwanmentioning

confidence: 99%

Unveiling attenuation structures in the northern Taiwan volcanic zone

Lin,

Ko,

Huang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

This cutting-edge study delves into regional magmatism in northern Taiwan through advanced 3-D P- and S-wave frequency-dependent attenuation tomography. Positioned at the dynamic convergence boundary between the Philippine Sea Plate and the Eurasian Plate, Taiwan experiences moderate earthquakes and intriguing volcanic activity, with a focus on the Tatun volcano group. Employing the Formosa seismic array for high-resolution results, our research identifies high-attenuation anomalies (low Q) beneath the northern Taiwan volcanic zone (NTVZ) and offshore submarine volcanoes, indicative of potential hydrothermal activities and magma reservoirs at varying depths. Additionally, we explore low-attenuation anomalies (high Q) in the forearc region of the Ryukyu subduction zone, suggestive of partial saturation linked to serpentinization processes resulting from seawater infiltration or forearc mantle hydration. These findings shed light on the complex geological features and provide essential insights into the crustal properties of northern Taiwan, contributing to a deeper understanding of its magmatic evolution and tectonic processes.

show abstract

“…For dispersion inversion application [4], understanding the surface-wave dispersion properties corresponding to high-velocity rigid pavement is crucial for accurate analysis. In general, we employ an ordinary inversion algorithm [5] based on the fundamental-mode Rayleigh-wave dispersion without top pavement structure, which can bring an estimating error of shear wave velocity (Vs).…”

Section: Introductionmentioning

confidence: 99%

Rayleigh Wave Dispersion and Inversion for Shallow Surface with a High-velocity Rigid Pavement

Zhang,

Zhang

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

We investigate the rigid pavement influence on phase velocity dispersion of the Rayleigh wave by using numerical modeling. An overestimation of Rayleigh wave phase velocity is observed more than 10% deviation caused by high-velocity rigid pavement. Based on the generalized reflection and transmission (R/T) coefficient method, the linear eigenvalue problem is solved for vertically heterogeneous media with a rigid pavement structure. The secular function demonstrates the multi-valuedness which is different phase velocity at the same frequency for the single Rayleigh mode. To address mode misidentification problem, we adopt a new misfit function for multimodal dispersion inversion. A Markov chain Monte Carlo (MCMC) sampling algorithm is used to solve dispersion inversion. The synthetic test shows that Rayleigh wave dispersion inversion incorporating a pavement layer can improve estimation accuracy of shear wave velocity.

show abstract

High‐Resolution 3‐D Shear Wave Velocity Model of Northern Taiwan via Bayesian Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity With Formosa Array

Cited by 6 publications

References 64 publications

The Crustal Magmatic Structure Beneath the Denali Volcanic Gap Imaged by a Dense Linear Seismic Array

The Crustal Magmatic Structure Beneath the Denali Volcanic Gap Imaged by a Dense Linear Seismic Array

Unveiling attenuation structures in the northern Taiwan volcanic zone

Rayleigh Wave Dispersion and Inversion for Shallow Surface with a High-velocity Rigid Pavement

Contact Info

Product

Resources

About