We present a new tectonic map focused upon the extensional style accompanying the formation of the Tyrrhenian back‐arc basin. Our basin‐wide analysis synthetizes the interpretation of vintage multichannel and single‐channel seismic profiles, integrated with modern seismic images, P‐wave velocity models, and high‐resolution morpho‐bathymetric data. Four distinct evolutionary phases of the Tyrrhenian back‐arc basin opening are further constrained, redefining the initial opening to Langhian/Serravallian time. Listric and planar normal faults and their conjugates bound a series of horst and graben, half‐graben and triangular basins. Distribution of extensional faults, active throughout the basin since Middle Miocene, allows us to define an arrangement of faults in the northern/central Tyrrhenian mainly related to a pure shear which evolved to a simple shear opening. At depth, faults accommodate over a Ductile‐Brittle Transitional zone cut by a low‐angle detachment fault. In the southern Tyrrhenian, normal, inverse and transcurrent faults appear to be related to a large shear zone located along the continental margin of the northern Sicily. Extensional style variation throughout the back‐arc basin combined with wide‐angle seismic velocity models allows to explore the relationships between shallow deformation, faults distribution throughout the basin, and crustal‐scale processes as thinning and exhumation.

中文翻译：

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第勒尼安弧后盆地形成过程中的伸展构造和新的构造构造图

我们提出了一个新的构造图，其重点是第勒尼安后弧盆地形成所伴随的伸展样式。我们对整个盆地的分析综合了对老式多通道和单通道地震剖面的解释，并结合了现代地震图像，P波速度模型和高分辨率形态计量学数据。第勒尼安弧后盆地开口的四个不同的演化阶段进一步受到限制，从而将初始开口重新定义为Langhian / Serravallian时间。李斯特性和平面性正断层及其共轭物束缚了一系列的霍斯特和grab陷，半盆状和三角形盆地。自中新世以来，在整个盆地活跃的伸展断层分布，使我们能够定义北部/中部第勒尼尼亚地区的断层排列，主要与纯剪切有关，而纯剪切则演变为简单的剪切孔。在深处，断层容纳在由低角度分离断层切割的韧性-脆性过渡带上。在第勒尼安南部，正断层，逆断层和逆流断层似乎与沿西西里北部大陆边缘的大剪切带有关。整个弧后盆地的伸展样式变化与广角地震速度模型相结合，可以探讨浅层变形，整个盆地的断层分布以及地壳尺度化过程（如变薄和发掘）之间的关系。逆断层和逆流断层似乎与西西里岛北部大陆边缘的大剪切带有关。整个弧后盆地的伸展样式变化与广角地震速度模型相结合，可以探讨浅层变形，整个盆地的断层分布以及地壳尺度化过程（如变薄和发掘）之间的关系。逆断层和逆流断层似乎与西西里岛北部大陆边缘的大剪切带有关。整个弧后盆地的伸展样式变化与广角地震速度模型相结合，可以探讨浅层变形，整个盆地的断层分布以及地壳尺度化过程（如变薄和发掘）之间的关系。