Shear wave velocities in the upper mantle of the Western Alps: new constraints using array analysis of seismic surface waves
文献类型：期刊论文
| 作者 | Lyu, Chao1,2,3; Pedersen, Helle A.2,3; Paul, Anne2,3; Zhao, Liang1; Solarino, Stefano4; CIFALPS Working Grp |
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2017-07-01 |
| 卷号 | 210期号:1页码:321-331 |
| 关键词 | Europe Surface waves and free oscillations Continental margins: convergent |
| ISSN号 | 0956-540X |
| DOI | 10.1093/gji/ggx166 |
| 文献子类 | Article |
| 英文摘要 | It remains challenging to obtain absolute shear wave velocities of heterogeneities of small lateral extension in the uppermost mantle. This study presents a cross-section of Vs across the strongly heterogeneous 3-D structure of the western European Alps, based on array analysis of data from 92 broad-band seismic stations from the CIFALPS experiment and from permanent networks in France and Italy. Half of the stations were located along a dense sublinear array. Using a combination of these stations and off-profile stations, fundamental-mode Rayleigh wave dispersion curves were calculated using a combined frequency-time beamforming approach. We calculated dispersion curves for seven arrays of approximately 100 km aperture and 14 arrays of approximately 50 km aperture, the latter with the aim of obtaining a 2-D vertical cross-section of Vs beneath the western Alps. The dispersion curves were inverted for Vs(z), with crustal interfaces imposed from a previous receiver function study. The array approach proved feasible, as Vs(z) from independent arrays vary smoothly across the profile length. Results from the seven large arrays show that the shear velocity of the upper mantle beneath the European plate is overall low compared to AK135 with the lowest velocities in the internal part of the western Alps, and higher velocities east of the Alps beneath the Po plain. The 2-D Vs model is coherent with (i) a similar to 100 km thick eastward-dipping European lithosphere west of the Alps, (ii) very high velocities beneath the Po plain, coherent with the presence of the Alpine (European) slab and (iii) a narrow low-velocity anomaly beneath the core of the western Alps (from the Brianc, onnais to the Dora Maira massif), and approximately colocated with a similar anomaly observed in a recent teleseismic P-wave tomography. This intriguing anomaly is also supported by traveltime variations of subvertically propagating body waves from two teleseismic events that are approximately located on the profile great circle. |
| WOS关键词 | ARRIVAL-ANGLE ANOMALIES ; RAYLEIGH-WAVES ; LITHOSPHERIC STRUCTURE ; EUROPEAN LITHOSPHERE ; AZIMUTHAL ANISOTROPY ; ADJOINT TOMOGRAPHY ; RECEIVER FUNCTIONS ; STRUCTURE BENEATH ; PHASE VELOCITIES ; FORM INVERSION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000409281300023 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41625016) ; National Natural Science Foundation of China(41625016) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) ; State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41625016) ; National Natural Science Foundation of China(41625016) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) ; State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41625016) ; National Natural Science Foundation of China(41625016) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) ; State Key Laboratory of Lithospheric Evolution, China ; State Key Laboratory of Lithospheric Evolution, China ; National Natural Science Foundation of China(41625016) ; National Natural Science Foundation of China(41625016) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) ; Labex OSUG (France)(Investissements d'avenir - ANR10 LABX56) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61875]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Zhao, Liang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Grenoble Alpes, ISTerre, F-38041 Grenoble, France 3.CNRS, ISTerre, F-38041 Grenoble, France 4.Ist Nazl Geofis & Vulcanol, CNT, I-16145 Genoa, Italy |
| 推荐引用方式 GB/T 7714 | Lyu, Chao,Pedersen, Helle A.,Paul, Anne,et al. Shear wave velocities in the upper mantle of the Western Alps: new constraints using array analysis of seismic surface waves[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2017,210(1):321-331. |
| APA | Lyu, Chao,Pedersen, Helle A.,Paul, Anne,Zhao, Liang,Solarino, Stefano,&CIFALPS Working Grp.(2017).Shear wave velocities in the upper mantle of the Western Alps: new constraints using array analysis of seismic surface waves.GEOPHYSICAL JOURNAL INTERNATIONAL,210(1),321-331. |
| MLA | Lyu, Chao,et al."Shear wave velocities in the upper mantle of the Western Alps: new constraints using array analysis of seismic surface waves".GEOPHYSICAL JOURNAL INTERNATIONAL 210.1(2017):321-331. |
入库方式： OAI收割
来源：地质与地球物理研究所
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