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Crustal structure beneath China from receiver function analysis

Chen, Youlin; Niu, Fenglin; Liu, Ruifeng; Huang, Zhibin; Tkalcic, Hrvoje; Sun, Li; Chan, Winston

Description

[1] We collected and processed a large amount of high-quality broadband teleseismic waveform data recorded by the 48 Chinese National Digital Seismic Network stations to estimate large-scale lateral variations of crustal thickness and V p/V s ratio (hence Poisson's ratio) beneath China. A statistical method was used to select mutually coherent receiver functions at each station, which yielded over 200 traces for most of the stations. With the conventional H- kappa; (the crustal thickness and V...[Show more]

dc.contributor.authorChen, Youlin
dc.contributor.authorNiu, Fenglin
dc.contributor.authorLiu, Ruifeng
dc.contributor.authorHuang, Zhibin
dc.contributor.authorTkalcic, Hrvoje
dc.contributor.authorSun, Li
dc.contributor.authorChan, Winston
dc.date.accessioned2015-12-08T22:19:44Z
dc.identifier.issn0148-0227
dc.identifier.urihttp://hdl.handle.net/1885/31688
dc.description.abstract[1] We collected and processed a large amount of high-quality broadband teleseismic waveform data recorded by the 48 Chinese National Digital Seismic Network stations to estimate large-scale lateral variations of crustal thickness and V p/V s ratio (hence Poisson's ratio) beneath China. A statistical method was used to select mutually coherent receiver functions at each station, which yielded over 200 traces for most of the stations. With the conventional H- kappa; (the crustal thickness and V p/V s ratio) approach, there is a large trade-off between H and K. Consequently, multiple maxima are frequently observed in the H- kappa; domain. We introduced a weight function that measures the coherence between the P-to-S conversion and the reverberation phases at each H- kappa; grid to reduce the trade-off. A 4th-root stacking method was further applied to reduce uncorrelated noise relative to the linear stack. These modifications turned out to be very effective in reducing the H- kappa; trade-off and yielded reliable estimates of crustal thickness and V p/V s ratio. The crust beneath eastern China is as thin as 31-33 km and the underlying Moho is relatively flat and sharp. In the western part of China, the crust is considerably thicker and shows large variations. The Moho is observed at about 51 km depth along the Tian Shan fold system and about 84 km deep beneath the central part of the Tibetan Plateau. The transition occurs at the so-called N-S belt between about 100° and 110°E, which is featured by unusually high seismicity and large gravity anomalies. The average V p/Vs ratio over the mainland China crust is about 1.730 (σ = 0.249), significantly lower than the global average 1.78 (σ = 0.27) of the continental crust. This lower V p/V s ratio may suggest a general absence of mafic lowermost crustal layer beneath China.
dc.publisherAmerican Geophysical Union
dc.sourceJournal of Geophysical Research
dc.subjectKeywords: continental crust; crustal structure; crustal thickness; fold and thrust belt; gravity anomaly; Moho; Poisson ratio; seismicity; statistical analysis; teleseismic wave; trade-off; waveform analysis; China
dc.titleCrustal structure beneath China from receiver function analysis
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume115
dc.date.issued2010
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.ariespublicationu4278572xPUB85
local.type.statusPublished Version
local.contributor.affiliationChen, Youlin, Array Information Technology
local.contributor.affiliationNiu, Fenglin, Rice University
local.contributor.affiliationLiu, Ruifeng, Chinese Earthquake network Centre
local.contributor.affiliationHuang, Zhibin, Chinese Earthquake Network Centre
local.contributor.affiliationTkalcic, Hrvoje, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSun, Li, Chinese Earthquake Network Centre
local.contributor.affiliationChan, Winston, Rice University
local.description.embargo2037-12-31
local.bibliographicCitation.startpageB03307
local.identifier.doi10.1029/2009JB006386
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T10:49:06Z
local.identifier.scopusID2-s2.0-84863337881
local.identifier.thomsonID000275498500001
CollectionsANU Research Publications

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