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首页> 美国卫生研究院文献>Scientific Reports >Slab narrowing in the Central Mediterranean: the Calabro-Ionian subduction zone as imaged by high resolution seismic tomography
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Slab narrowing in the Central Mediterranean: the Calabro-Ionian subduction zone as imaged by high resolution seismic tomography

机译：地中海中部的板块变窄：高分辨率地震层析成像法成像的卡拉布罗-爱奥尼亚俯冲带

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摘要

A detailed 3D image of the Calabro-Ionian subduction system in the central Mediterranean was obtained by means of a seismic tomography, exploiting a large dataset of local earthquakes and computing algorithms able to build a dense grid of measure nodes. Results show that the slab is continuous below the southern sector of the Calabro-Peloritan Arc, but the deformation processes developing at its edges are leading to its progressive narrowing, influencing tectonics and magmatism at the surface, and with possible stress concentration in the tip zones. In the southwest, the deformation occurring at a free slab edge lead to propagation of a vertical lithospheric tear in the overriding plate, which extends along a NW-SE fault system (Aeolian-Tindari-Letojanni) up to about 30 km into the Ionian Sea; further southeast, the lithosphere appears only flexed and not broken yet. In the northeast, the slab seems to break progressively, parallel to the trench. Finally, northwest of Mt. Etna, the tomography highlights low VP that can be related to an upwelling of deep mantle material likely flowing laterally through a window opened by the complete slab detachment.
机译：通过地震层析成像，利用大型局部地震数据集和能够建立密集测量节点网格的计算算法，获得了地中海中部Calabro-Ionian俯冲系统的详细3D图像。结果表明，该板块在卡拉布勒-佩洛里坦弧的南段以下是连续的，但是在其边缘发展的变形过程导致其逐渐变窄，影响了地表构造和岩浆作用，并可能在尖端区域集中了应力。 。在西南部，在自由平板边缘发生的形变导致上覆板块中垂直岩石圈撕裂的传播，沿着NW-SE断层系统（风神-廷达里-莱托詹尼）延伸至爱奥尼亚海约30km ;再往东南看，岩石圈似乎只有弯曲而还没有破裂。在东北部，平板似乎逐渐地破裂，与海沟平行。终于，西北山。 Etna断层扫描显示低VP，这可能与深地幔物质的上升有关，该上升可能是通过完全的板块分离而打开的窗户横向流过的。

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