Adjoint Tomography of Ambient Noise Data and Teleseismic P Waves: Methodology and Applications to Central California

Wang, Kai; Yang, Yingjie; Jiang, Chengxin; Wang, Yi; Tong, Ping; Liu, Tianshi; Liu, Qinya

doi:10.1029/2021jb021648

Cited by 14 publications

(13 citation statements)

References 100 publications

(204 reference statements)

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“…Overall, these high-velocity anomalies have a velocity comparable to the Feather River Ophiolite (serpentinized ultramafic rocks) and match well with the magnetic potential anomaly in this area, and thus are interpreted as pieces of ancient oceanic crust preserved during the past tectonic collision and subduction (Benz et al, 1992;Thurber et al, 2009). Low velocities at the LVC and CVF areas have been observed in both crustal Vp and Vs images from local (Flinders et al, 2018;Seccia et al, 2011;Yang et al, 2011) and regional (e.g., Jiang et al, 2018;Jones et al, 2014;Thurber et al, 2009;Wang et al, 2021) tomographic studies and are mostly attributed to melting and heating from mantle upwelling due to the foundering of the dense lower crust or lithosphere (e.g., Bernardino et al, 2019;Boyd et al, 2004;Jones et al, 2014;Zandt et al, 2004). Beneath the LVC, our Vp model reveals two low-velocity zones (<−8%) at depths of less than 3-4 km and depths of 7-16 km, separated by a weak low-velocity zone (with the magnitude less than 2%, CC' and FF' in Figure 7).…”

Section: Structural Heterogeneitiessupporting

confidence: 62%

“…Low velocities at the LVC and CVF areas have been observed in both crustal Vp and Vs images from local (Flinders et al., 2018; Seccia et al., 2011; Yang et al., 2011) and regional (e.g., Jiang et al., 2018; Jones et al., 2014; Thurber et al., 2009; Wang et al., 2021) tomographic studies and are mostly attributed to melting and heating from mantle upwelling due to the foundering of the dense lower crust or lithosphere (e.g., Bernardino et al., 2019; Boyd et al., 2004; Jones et al., 2014; Zandt et al., 2004). Beneath the LVC, our Vp model reveals two low‐velocity zones (<−8%) at depths of less than 3–4 km and depths of 7–16 km, separated by a weak low‐velocity zone (with the magnitude less than 2%, CC’ and FF’ in Figure 7).…”

Section: Discussionmentioning

confidence: 99%

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Crustal Deformation in the Sierra Nevada and Walker Lane Region Inferred From P‐Wave Azimuthal Anisotropy

Wang

Tong

2022

JGR Solid Earth

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The Sierra Nevada and Walker Lane region is located in the transition zone between the Pacific and North American plates (Figure 1). The long-term Mesozoic-Cenozoic subduction and subsequent right-lateral transform motion of the plate boundary have jointly contributed to the formation of its major tectonic units, including a volcanic arc (Sierra Nevada Batholith, SNB), an island arc complex (Sierra Nevada Metamorphic Belt, SNMB), and the Walker Lane shear zone (Atwater & Stock, 1998;Benz et al., 1992;Thurber et al., 2009). The Sierra Nevada mountain range mainly comprises metamorphic sedimentary and volcanic rocks in the SNMB and intrusive granitic rocks in the SNB (Irwin & Wallace, 1990), both of which were formed during past subduction processes. The Walker Lane is a relatively young transform/transtensional fault system as compared to the San Andreas Fault (SAF) to the west and is marked by NW-striking dextral strike-slip faults, Sierran range front normal faults, and a few left-lateral faults between the NW moving Sierra Nevada and E-W extending Basin and Range (Wesnousky, 2005). It has been suggested that the foundering of the eastern Sierran lithospheric mantle and/or crustal root in the Neogene period leads to convective mantle upwelling which is responsible for the crustal thinning, uplift of the Sierran range, and formation of young volcanism such as the Long Valley Caldera (LVC)

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Section: Structural Heterogeneitiessupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Crustal Deformation in the Sierra Nevada and Walker Lane Region Inferred From P‐Wave Azimuthal Anisotropy

Wang

Tong

2022

JGR Solid Earth

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“…Considering that the stacking process mitigates local lateral heterogeneity within each subarray, the lateral resolution of the raw subarray will be smeared. Therefore, this technique cannot be directly used for 2D seismic imaging, for example, full waveform inversion (Sager et al., 2018; W. Wang et al., 2017), adjoint tomography (K. Wang et al., 2021; Zhang et al., 2018) and wave‐equation dispersion inversion (Li et al., 2017; H. Liu et al., 2022); while it would be appropriate for our dispersion curve inversion where 1D or layer model is assumed.…”

Section: Methodsmentioning

confidence: 99%

High‐Resolution Near‐Surface Imaging at the Basin Scale Using Dark Fiber and Distributed Acoustic Sensing: Toward Site Effect Estimation in Urban Environments

Cheng,

Ajo‐Franklin,

Rodriguez Tribaldos

2023

JGR Solid Earth

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Near‐surface seismic structure, particularly the shear wave velocity (Vs), can strongly affect local site response, and should be accurately estimated for ground motion prediction during seismic hazard assessment. The Imperial Valley (California), occupying the southern end of the Salton Trough, is a seismically active basin with thick surficial lacustrine sedimentary deposits. In this study, we utilize ambient noise records and local earthquake events for high‐resolution near‐surface characterization and site effect estimation with an unlit fiber‐optic telecommunication infrastructure (dark fiber) in Imperial Valley by using the distributed acoustic sensing (DAS) technique. We apply ambient noise interferometry to retrieve coherent surface waves from DAS records, and evaluate performances of three different surface wave methods on DAS ambient noise dispersion imaging. We develop a quality control workflow to improve the dispersion measurement of noisy portions of the DAS dataset by using a data selection strategy. Using the joint inversion of both the fundamental mode and higher overtones of Rayleigh waves, a high resolution two‐dimensional (2D) Vs structure down to 70 m depth is obtained. We successfully achieve an improved Vs30 (the time‐averaged shear‐wave velocity in the top 30 m) model with higher spatial‐resolution and reliability compared to the existing community model for the area. We also explore the potential for utilizing DAS earthquake events for site amplification estimation. The preliminary results reveal a clear anti‐correlation between the approximated site response and the Vs30 profile. Our results indicate the potential utility of DAS deployed on dark fiber for near‐surface characterization in appropriate contexts.

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“…Teleseismic full‐waveform inversion (FWI) also uses finite‐frequency misfit kernels to invert for velocity and density models with a nonlinear iterative algorithm (Monteiller et al., 2015; K. Wang et al., 2021a). This method has been applied to continental subduction zones to constrain lateral heterogeneities (Beller et al., 2018; K. Wang et al., 2021b; Y. Wang et al., 2016). However, teleseismic FWI needs high‐quality coherent P coda waves on vertical and radial components, which are rare in real data due to complex source spectral contents (Beller et al., 2018), especially for high frequency data.…”

Section: Introductionmentioning

confidence: 99%

Receiver Function Adjoint Tomography for Three‐Dimensional High‐Resolution Seismic Array Imaging: Methodology and Applications in Southeastern Tibet

Xu,

Wang,

Chen

et al. 2023

Geophysical Research Letters

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A new technique for P‐wave receiver function (PRF) inversion, within the framework of wave equation‐based adjoint tomography and referred to as receiver function adjoint tomography (RFAT), has been developed to obtain models of Vp, Vs, and density. This innovative technique fits the synthetic PRFs with observed PRFs and can better image the lateral variations of Vs from the crust to the uppermost mantle than traditional 1‐D PRF inversion. We utilized RFAT to perform high‐resolution imaging beneath a dense seismic array in Southeastern Tibet, revealing low‐velocity zones extending from the uppermost mantle to the crust, as well as an eastward dipping Moho under the Red River Fault (RRF). Our inversion results provide direct evidence for the existence of a distinct asthenospheric upwelling channel beneath the RRF, and further highlight the effectiveness of RFAT for accurately imaging subsurface structures.

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Adjoint Tomography of Ambient Noise Data and Teleseismic P Waves: Methodology and Applications to Central California

Abstract: Traditional teleseismic traveltime tomography using body waves has imaged a lot of high-resolution three-dimensional (3D) models of mantle structures (e.g.,

Cited by 14 publications

References 100 publications

Crustal Deformation in the Sierra Nevada and Walker Lane Region Inferred From P‐Wave Azimuthal Anisotropy

Crustal Deformation in the Sierra Nevada and Walker Lane Region Inferred From P‐Wave Azimuthal Anisotropy

High‐Resolution Near‐Surface Imaging at the Basin Scale Using Dark Fiber and Distributed Acoustic Sensing: Toward Site Effect Estimation in Urban Environments

Receiver Function Adjoint Tomography for Three‐Dimensional High‐Resolution Seismic Array Imaging: Methodology and Applications in Southeastern Tibet

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