Low wave speed zones in the crust beneath SE Tibet revealed by ambient noise adjoint tomography

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dc.citation.firstpage334en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitleGeophysical Research Lettersen_US
dc.citation.lastpage340en_US
dc.citation.volumeNumber41en_US
dc.contributor.authorChen, Minen_US
dc.contributor.authorHuang, Huien_US
dc.contributor.authorYao, Huajianen_US
dc.contributor.authorvan der Hilst, Roben_US
dc.contributor.authorNiu, Fenglinen_US
dc.date.accessioned2014-04-04T21:32:12Zen_US
dc.date.available2014-04-04T21:32:12Zen_US
dc.date.issued2014en_US
dc.description.abstractWe present a refined 3D crustal model beneath SE Tibet from ambient noise adjoint tomography. Different from ray-theory-based tomography, adjoint tomography in this study incorporates a spectral-element method (SEM) and takes empirical Green's functions (EGFs) of Rayleigh waves from ambient noise interferometry as the direct observation. The frequency-dependent traveltime misfits between SEM synthetic Green's functions and EGFs are minimized with a preconditioned conjugate gradient method, meanwhile the 3D model gets improved iteratively utilizing 3D finite-frequency kernels. The new model shows 3 - 6% shear wave speed increasing beneath the western Sichuan Basin (SCB) (depth>15 km) and the central Chuan-Dian Block (CDB), and 6 - 12% shear wave speed reduction in the mid-lower crust beneath the northern and the southern CDB. The inferred spatial pattern of low wave speed zones, consistent with possible partial melt, suggests more complex and disconnected geometry than the pervasive narrow zone from the channel flow models.en_US
dc.identifier.citationChen, Min, Huang, Hui, Yao, Huajian, et al.. "Low wave speed zones in the crust beneath SE Tibet revealed by ambient noise adjoint tomography." <i>Geophysical Research Letters,</i> 41, no. 2 (2014) American Geophysical Union: 334-340. http://dx.doi.org/10.1002/2013GL058476.en_US
dc.identifier.doihttp://dx.doi.org/10.1002/2013GL058476en_US
dc.identifier.urihttps://hdl.handle.net/1911/75816en_US
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleLow wave speed zones in the crust beneath SE Tibet revealed by ambient noise adjoint tomographyen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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