Multiparameter adjoint tomography of the crust and upper mantle beneath East Asia: 1. Model construction and comparisons

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dc.citation.firstpage1762en_US
dc.citation.issueNumber3en_US
dc.citation.journalTitleJournal of Geophysical Research: Solid Earthen_US
dc.citation.lastpage1786en_US
dc.citation.volumeNumber120en_US
dc.contributor.authorChen, Minen_US
dc.contributor.authorNiu, Fenglinen_US
dc.contributor.authorLiu, Qinyaen_US
dc.contributor.authorTromp, Jeroenen_US
dc.contributor.authorZheng, Xiufenen_US
dc.date.accessioned2015-05-15T17:06:34Z
dc.date.available2015-05-15T17:06:34Z
dc.date.issued2015en_US
dc.description.abstractWe present a 3-D radially anisotropic model of the crust and mantle beneath East Asia down to 900 km depth. Adjoint tomography based on a spectral element method is applied to a phenomenal data set comprising 1.7 million frequency-dependent traveltime measurements from waveforms of 227 earthquakes recorded by 1869 stations. Compressional wave speeds are independently constrained and simultaneously inverted along with shear wave speeds (VSH and VSV) using the same waveform data set with comparable resolution. After 20 iterations, the new model (named EARA2014) exhibits sharp and detailed wave speed anomalies with improved correlations with surface tectonic units compared to previous models. In the upper 100 km, high wave speed (high-V) anomalies correlate very well with the Junggar and Tarim Basins, the Ordos Block, and the Yangtze Platform, while strong low wave speed (low-V) anomalies coincide with the Qiangtang Block, the Songpan Ganzi Fold Belt, the Chuandian Block, the Altay-Sayan Mountain Range, and the back-arc basins along the Pacific and Philippine Sea Plate margins. At greater depths, narrow high-V anomalies correspond to major subduction zones and broad high-V anomalies to cratonic roots in the upper mantle and fragmented slabs in the mantle transition zone. In particular, EARA2014 reveals a strong high-V structure beneath Tibet, appearing below 100 km depth and extending to the bottom of the mantle transition zone, and laterally spanning across the Lhasa and Qiangtang Blocks. In this paper we emphasize technical aspects of the model construction and provide a general discussion through comparisons.en_US
dc.identifier.citationChen, Min, Niu, Fenglin, Liu, Qinya, et al.. "Multiparameter adjoint tomography of the crust and upper mantle beneath East Asia: 1. Model construction and comparisons." <i>Journal of Geophysical Research: Solid Earth,</i> 120, no. 3 (2015) Wiley: 1762-1786. http://dx.doi.org/10.1002/2014JB011638.
dc.identifier.doihttp://dx.doi.org/10.1002/2014JB011638en_US
dc.identifier.urihttps://hdl.handle.net/1911/80221
dc.language.isoengen_US
dc.publisherWiley
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.
dc.subject.keywordEast Asiaen_US
dc.subject.keywordadjoint tomographyen_US
dc.subject.keywordshear wave speeden_US
dc.subject.keywordcompressional wave speeden_US
dc.subject.keywordradial anisotropyen_US
dc.titleMultiparameter adjoint tomography of the crust and upper mantle beneath East Asia: 1. Model construction and comparisonsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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