New constraints on the 3D shear wave velocity structure of the upper mantle underneath Southern Scandinavia revealed from non-linear tomography
New constraints on the 3D shear wave velocity structure of the upper mantle underneath Southern Scandinavia revealed from non-linear tomography
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非线性断层扫描揭示了斯堪的纳维亚半岛南部下方上地幔 3D 剪切波速度结构的新约束
DOI:
10.1016/j.tecto.2012.12.033
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发表时间:
2013
期刊:
影响因子:
2.9
通讯作者:
J.R.R.
中科院分区:
文献类型:
--
作者:
Wawerzinek;Ritter;J.R.R.
We analyse travel times of shear waves, which were recorded at the MAGNUS network, to determine the 3D shear wave velocity (vS) structure underneath Southern Scandinavia. The travel time residuals are corrected for the known crustal structure of Southern Norway and weighted to account for data quality and pick uncertainties. The resulting residual pattern of subvertically incident waves is very uniform and simple. It shows delayed arrivals underneath Southern Norway compared to fast arrivals underneath the Oslo Graben and the Baltic Shield. The 3D upper mantlevSstructure underneath the station network is determined by performing non-linear travel time tomography. As expected from the residual pattern the resulting tomographic model shows a simple and continuousvSperturbation pattern: a negativevSanomaly is visible underneath Southern Norway relative to the Baltic Shield in the east with a contrast of up to 4%vSand a sharp W–E dipping transition zone. Reconstruction tests reveal besides vertical smearing a good lateral reconstruction of the dippingvStransition zone and suggest that a deep-seated anomaly at 330–410 km depth is real and not an inversion artefact. The upper part of the reducedvSanomaly underneath Southern Norway (down to 250 km depth) might be due to an increase in lithospheric thickness from the Caledonian Southern Scandes in the west towards the Proterozoic Baltic Shield in Sweden in the east. The deeper-seated negativevSanomaly (330–410 km depth) could be caused by a temperature anomaly possibly combined with effects due to fluids or hydrous minerals. The determined simple 3DvSstructure underneath Southern Scandinavia indicates that mantle processes might influence and contribute to a Neogene uplift of Southern Norway.
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