Highlights on mantle deformation beneath the Western Alps with seismic anisotropy using CIFALPS2 data

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Silvia Pondrelli, Simone Salimbeni, Judith M. Confal, Marco Malusà, Anne Paul, Stephane Guillot, Stefano Solarino, Elena Eva, Coralie Aubert, Liang Zhao
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Abstract

Abstract. There are still open questions about the deep structure beneath the Western Alps. Seismic velocity tomographies show the European slab subducting beneath the Adria plate, but all these images did not clarify completely about the possible presence of tears, slab windows or detachments. Seismic anisotropy, addressed as an indicator of mantle deformation and studied using data recorded by dense networks, may shed some light about the location and orientation of mantle flow at depth. Using the large amount of shear wave splitting and splitting intensity measurements available in the Western Alps, collected through the CIFALPS2 temporary seismic network, together with already available data, highlight some new patterns, filling the gaps left by previous studies. Instead of the typical seismic anisotropy pattern parallel to the entire arc of the Western Alps, this study supports the presence of a differential contribution along the belt, only partly related to the European slab retreat. A nearly NS anisotropy pattern beneath the external Alps, direction that cuts the morphological features of the belt, is clearly found with the new CIFALPS2 measurements. It is however confirmed that the asthenospheric flow from Central France toward the Tyrrhenian Sea, is turning around the southern tip of the European slab.
利用 CIFALPS2 数据和地震各向异性研究西阿尔卑斯山下地幔变形的要点
摘要关于西阿尔卑斯山下的深层结构,仍有一些未解之谜。地震速度层析成像显示欧洲板块在阿德里亚板块下俯冲,但所有这些图像都没有完全澄清可能存在的裂缝、板块窗口或脱离。地震各向异性是地幔变形的一个指标,利用密集网络记录的数据对其进行研究,可以揭示地幔在深部流动的位置和方向。通过 CIFALPS2 临时地震台网在西阿尔卑斯山收集到的大量剪切波分裂和分裂强度测量数据,加上已有的数据,凸显了一些新的模式,填补了以往研究的空白。与典型的平行于整个西阿尔卑斯山弧线的地震各向异性模式不同,这项研究证实了该地震带沿线存在着不同的贡献,其中只有一部分与欧洲板块后退有关。新的 CIFALPS2 测量清楚地发现了外部阿尔卑斯山下的近乎 NS 的各向异性模式,该模式切割了该地带的形态特征。不过,可以确认的是,从法国中部流向第勒尼安海的星体层流正在围绕欧洲板块的南端转动。
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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