On the limitations of interstation distances in ambient noise tomography

Luo, Yinhe; Yang, Yingjie; Xu, Yixian; Xu, Hongrui; Zhao, Kaifeng; Wang, Kai

doi:10.1093/gji/ggv043

Cited by 151 publications

(90 citation statements)

References 32 publications

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“…Having obtained the reliable empirical Green's functions, we then pick up dispersion curves for Rayleigh wave group and phase velocities simultaneously by performing the frequency‐time analysis with phase‐matched filtering procedures (Levshin & Ritzwoller, ). Before applying the 2‐D surface wave tomography, we select the measurements from frequency‐time analysis with signal‐to‐noise ratio greater than 12 and interstation distance greater than one wavelength (Bensen et al, ; Luo et al, ). Following Barmin et al (), we invert the selected dispersion curves for 2‐D group and phase velocity maps at periods from 8 to 45 s on 0.25° × 0.25° grid.…”

Section: Methodsmentioning

confidence: 99%

Ambient Noise Tomography Across the Taiwan Strait, Taiwan Island, and Southwestern Ryukyu Arc: Implications for Subsurface Slab Interactions

Zheng

Xiong

2019

Tectonics

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The subduction flipping in the Taiwan region leads to complexities in the lithospheric structure. To better understand the arc-continental collision process in this zone, we construct a 3-D lithospheric model of the Taiwan Strait, Taiwan Island, and southwestern Ryukyu Arc. In the middle to lower crust, low velocities are mainly located beneath the Ryukyu Trough and the rifted basins in the Taiwan Strait, and high velocities are imaged in the Kuanyin and Penghu Platforms. Likely, the Kuanyin and Penghu Platforms act as relatively strong barriers that block the persistent westward advance of the western deformation front of the Taiwan mountain belt, as manifested by shape of the deformation front that withdraws to the east in the basement highs. In the mantle, high velocities are observed beneath the Central Range and Ryukyu Arc, which is interpreted as the two oppositely oriented slab subductions, that is, subduction of the Philippine Sea slab in the northeast Taiwan and Eurasian slab subduction in south Taiwan. Based on the vertical transects through our 3-D model, we find that the subduction polarity has flipped in north Taiwan, and the tectonic framework in central Taiwan is in the process of subduction polarity reversal. We also image significant low mantle velocities beneath the North Taiwan Volcanic Zone and Taihsi Basin, which may be related to the breakoff of the subducting Eurasian slab. In addition, we propose that the inherited weakness of the Taihsi Basin may have facilitated the slab breakoff in central Taiwan.Plain Language Summary In this work we collect the seismic data recorded by seismic stations in and around the Taiwan orogen and build a high-resolution lithospheric velocity model for an area including the Taiwan Strait, Taiwan Island, and southwestern Ryukyu Arc by ambient noise tomography. The model exhibits low crust velocity anomalies in the Ryukyu Trough and rifted basins of the Taiwan Strait, and low velocities in the uppermost mantle beneath the North Taiwan Volcanic Zone and Taihsi Basin. Based on the tomographic images, we clearly find that the subduction polarity has been flipped in north Taiwan, and the tectonic framework in central Taiwan is in the process of subduction polarity reversal, which is in consistent with the geological observations.

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Section: Methodsmentioning

confidence: 99%

Ambient Noise Tomography Across the Taiwan Strait, Taiwan Island, and Southwestern Ryukyu Arc: Implications for Subsurface Slab Interactions

Zheng

Xiong

2019

Tectonics

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“…To resolve the 2π ambiguity, we track the dispersion curve from long period to short period, and use the group velocity (U = ∂w/∂k) to guide the instantaneous slope of the dispersion curve. The longest period used for each station pair is limited by one wavelength (Luo et al 2015) to satisfy the far-field approximation.…”

Section: Phase Velocity Mapsmentioning

confidence: 99%

Structure of the Los Angeles Basin from ambient noise and receiver functions

Ma¹,

Clayton²

2016

Geophys. J. Int.

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S U M M A R YA velocity (Vs) and structure model is derived for the Los Angeles Basin, California based on ambient-noise surface wave and receiver-function analysis, using data from a low-cost, short-duration, dense broad-band survey (LASSIE) deployed across the basin. The shear wave velocities show lateral variations at the Compton-Los Alamitos and the Whittier Faults. The basement beneath the Puente Hills-San Gabriel Valley shows an unusually high velocity (∼4.0 km s −1 ) and indicates the presence of schist. The structure of the model shows that the basin is a maximum of 8 km deep along the profile and that the Moho rises to a depth of 17 km under the basin. The basin has a stretch factor of 2.6 in the centre grading to 1.3 at the edges and is in approximate isostatic equilibrium.

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“…Reliable dispersion measurements for a given period require an interstation spacing of at least one wavelength (Luo et al, 2015), which was considered during selection of the reliable paths. In most cases, the crosscorrelation function was not symmetric, indicating uneven distribution of noise sources as described in the previous section.…”

Section: Measuring Group Velocitiesmentioning

confidence: 99%