Crustal structure of southeast Australia from teleseismic receiver functions
نویسندگان
چکیده
Abstract. In an effort to improve our understanding of the seismic character crust beneath southeast Australia and how it relates tectonic evolution region, we analyse teleseismic earthquakes recorded by 24 temporary 8 permanent broadband stations using receiver function method. Due proximity Bass Strait, only 13 these yielded usable functions, whereas seven produced functions for subsequent analysis. Crustal thickness, bulk velocity properties, internal crustal structure southern Tasmanides – assemblage Palaeozoic accretionary orogens that occupy eastern are constrained H–κ stacking inversion, which point following: a ∼ 39.0 km thick crust; intermediate–high Vp/Vs ratio (∼ 1.70–1.76), relative ak135; broad (> 10 km) crust–mantle transition Lachlan Fold Belt. These results interpreted represent magmatic underplating mafic materials at base crust. complex VanDieland, putative Precambrian continental fragment embedded in southernmost Tasmanides, features strong variability thickness (23–37 (1.65–193), latter likely represents compositional presence melt. The origins comprises multiple ribbons, coupled with recent failed rifting intraplate volcanism, contributes observations. located East Tasmania Terrane Strait (ETT + EB) collectively indicate uniform (31–32 km), clearly distinguishes from VanDieland west. Moho depths also compared continent-wide AusMoho model shown be largely consistent, except regions where has few constraints (e.g. Flinders Island). A joint interpretation new ambient noise, tomography, shear wave splitting anisotropy helps provide insight into way been shaped events, including during break-up Antarctica volcanism.
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ژورنال
عنوان ژورنال: Solid Earth
سال: 2021
ISSN: ['1869-9529', '1869-9510']
DOI: https://doi.org/10.5194/se-12-463-2021