Full‐wave multiscale anisotropy tomography in Southern California

Lin, Yu‐Pin; Zhao, Li; Hung, S.

doi:10.1002/2014gl061855

Cited by 22 publications

(28 citation statements)

References 44 publications

(77 reference statements)

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“…The depth variation of anisotropy does not suggest a lithosphere-asthenosphere decoupling proposed by Monteiller and Chevrot (2011). At long wavelengths, the fast directions of anisotropy are aligned with the absolute plate motion inside the Pacific and North American plates (Lin et al, 2014).…”

Section: Shear-wave Splitting Tomographymentioning

confidence: 69%

“…At the top of the asthenosphere, the observed low level of anisotropy suggests weak lithospheric basal tractions and thus a strong decoupling between the lithosphere and the asthenosphere. Lin et al (2014) applied a full-wave approach to image the uppermantle anisotropy in Southern California using 5954 SKS splitting data. They adopted 3-D sensitivity kernels combined with a waveletbased model parameterization in a multiscale inversion.…”

Section: Shear-wave Splitting Tomographymentioning

confidence: 99%

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Seismic anisotropy tomography: New insight into subduction dynamics

2016

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Body-wave and surface-wave tomography, receiver-function imaging, and shear-wave splitting measurements have shown that seismic anisotropy and heterogeneity coexist in all parts of subduction zones, providing important constraints on the mantle flow and subduction dynamics. P-wave anisotropy tomography is a new but powerful tool for mapping three-dimensional variations of azimuthal and radial seismic anisotropy in the crust and mantle. P-wave azimuthal-anisotropy tomography has been applied widely to the Circum-Pacific subduction zones, Mainland China and North America, whereas P-wave radial-anisotropy tomography was applied to only a few areas including Northeast Japan, Southwest Japan and North China Craton. These studies have revealed complex anisotropy in the crust and mantle lithosphere associated with the surface geology and tectonics, anisotropy reflecting subduction-driven corner flow in the mantle wedge, frozen-in fossil anisotropy in the subducting slabs formed at the mid-ocean ridge, as well as olivine fabric transitions due to changes in water content, stress and temperature. Shear-wave splitting tomography methods have been also proposed, but their applications are still limited and preliminary. There is a discrepancy between the surface-wave and body-wave tomographic models in radial anisotropy of the mantle wedge beneath Japan, which is a puzzle but an intriguing topic for future studies.

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Section: Shear-wave Splitting Tomographymentioning

confidence: 69%

Section: Shear-wave Splitting Tomographymentioning

confidence: 99%

Seismic anisotropy tomography: New insight into subduction dynamics

2016

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“…Seismic anisotropy is frequently observed in fault zones and has been studied extensively using seismological techniques including shear wave splitting observations [e.g., Cochran et al, 2003] and anisotropy tomography [Zhang et al, 2007;Lin et al, 2014]. Where shear wave splitting is observed in fault zones, fast directions are often determined to be between the regional maximum compressive stress direction and fault parallel and may change as the strike of the fault changes [e.g., Cochran et al, 2003;Liu et al, 2004;Cochran and Kroll, 2015].…”

Section: Introductionmentioning

confidence: 99%

Seismically invisible fault zones: Laboratory insights into imaging faults in anisotropic rocks

Kelly

Faulkner

Rietbrock

2017

Geophysical Research Letters

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Phyllosilicate‐rich rocks which commonly occur within fault zones cause seismic velocity anisotropy. However, anisotropy is not always taken into account in seismic imaging and the extent of the anisotropy is often unknown. Laboratory measurements of the velocity anisotropy of fault zone rocks and gouge from the Carboneras fault zone in SE Spain indicate 10–15% velocity anisotropy in the gouge and 35–50% anisotropy in the mica‐schist protolith. Greater differences in velocity are observed between the fast and slow directions in the mica‐schist rock than between the gouge and the slow direction of the rock. This implies that the orientation of the anisotropy with respect to the fault is key in imaging the fault seismically. For example, for fault‐parallel anisotropy, a significantly greater velocity contrast between fault gouge and rock will occur along the fault than across it, highlighting the importance of considering the foliation orientation in design of seismic experiments.

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“…Furthermore, because of the nonmonochromatic nature of the XKS arrivals, the size of the Fresnel zone and thus the depth of anisotropy are dependent on the dominant frequencies of the waveforms (Rumpker & Ryberg, 2000), which may vary from events to events. Another approach relying on the finite frequency effect of SKS splittings produces 3-D anisotropic structure using splitting intensity measurements (Favier & Chevrot, 2003;Y. Lin et al, 2014;Monteiller & Chevrot, 2011).…”

Section: Xks Splitting-based Depth Estimation Approachesmentioning

confidence: 99%

“…The method requires densely spaced stations, and different inversion parameters such as the damping factor can lead to considerably different results, as demonstrated by two recent studies for Southern California, which reached significantly different conclusions about the strength and existence of lithospheric and sublithospheric anisotropy (Y. Lin et al, 2014;Monteiller & Chevrot, 2011).…”

Section: Xks Splitting-based Depth Estimation Approachesmentioning

confidence: 99%

Receiver Function Investigations of Seismic Anisotropy Layering Beneath Southern California

et al. 2018

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Seismic azimuthal anisotropy characterized by shear wave splitting analyses using teleseismic XKS phases (including SKS, SKKS, and PKS) is widely employed to constrain the deformation field in the Earth's crust and mantle. Due to the near‐vertical incidence of the XKS arrivals, the resulting splitting parameters (fast polarization orientations and splitting times) have an excellent horizontal but poor vertical resolution, resulting in considerable ambiguities in the geodynamic interpretation of the measurements. Here we use P‐to‐S converted phases from the Moho and the 410‐ (d410) and 660‐km (d660) discontinuities to investigate anisotropy layering beneath Southern California. Similarities between the resulting splitting parameters from the XKS and P‐to‐S converted phases from the d660 suggest that the lower mantle beneath the study area is azimuthally isotropic. Similarly, significant azimuthal anisotropy is not present in the mantle transition zone on the basis of the consistency between the splitting parameters obtained using P‐to‐S converted phases from the d410 and d660. Crustal anisotropy measurements exhibit a mean splitting time of 0.2 ± 0.1 s and mostly NW‐SE fast orientations, which are significantly different from the dominantly E‐W fast orientations revealed using XKS and P‐to‐S conversions from the d410 and d660. Anisotropy measurements using shear waves with different depths of origin suggest that the Earth's upper mantle is the major anisotropic layer beneath Southern California. Additionally, this study demonstrates the effectiveness of applying a set of azimuthal anisotropy analysis techniques to reduce ambiguities in the depth of the source of the observed anisotropy.

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Full‐wave multiscale anisotropy tomography in Southern California

Cited by 22 publications

References 44 publications

Seismic anisotropy tomography: New insight into subduction dynamics

Seismic anisotropy tomography: New insight into subduction dynamics

Seismically invisible fault zones: Laboratory insights into imaging faults in anisotropic rocks

Receiver Function Investigations of Seismic Anisotropy Layering Beneath Southern California

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