The Calabrian Arc: three-dimensional modelling of the subduction interface.

The Calabrian Arc: three-dimensional modelling of the subduction interface.
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Calabrian弧:俯冲界面的三维建模。

DOI:
10.1038/s41598-017-09074-8
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发表时间:
2017-08-21
期刊:
影响因子:
4.6
通讯作者:
Basili R
Basili R
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Maesano FE;Tiberti MM;Basili R

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卡拉布里亚弧是一个独一无二的俯冲带,具有世界上最短的板片段(<150 千米)、最厚的吸积楔之一和世界上最古老的洋壳之一。尽管会聚速度高达5毫米/年,众所周知的实验室内地震活动低于40 公里,但其浅层界面几乎没有显示出地震活动的迹象。尽管如此,它被归因于引发了历史上的大地震和海啸。为了深入了解这个俯冲带,我们首先对浅层板岩界面(<20 千米)及其上覆的增长楔形进行了地质重建,解释了在105km2的面积内由54条地震反射线(8,658 千米)和438个交叉点组成的网格。然后,我们使用地震活动性分布来约束板材表面的更深部分(40-350 Km)。最后,我们对这两个部分进行了内插,得到了一个无缝的3D表面,突出了俯冲界面的几何细节、其侧向末端和向下倾角的曲率,以及在70-100 公里深度处的板块撕裂。我们的卡拉布里亚弧的3D平板模型将有助于理解地中海构造谜题中的基石的地球动力学,并估计该地区的地震和海啸危险。
The Calabrian Arc is a one-of-a-kind subduction zone, featuring one of the shortest slab segments (<150 km), one of the thickest accretionary wedges, and one of the oldest oceanic crust in the world. Despite a convergence rate of up to 5 mm/y and well-known intraslab seismicity below 40 km, its shallow interface shows little signs of seismic activity. Nonetheless, it has been attributed as generating historical large earthquakes and tsunamis. To gain insights into this subduction zone, we first made a geological reconstruction of the shallower slab interface (<20 km) and its overlying accretionary wedge by interpreting a grid of 54 seismic reflection lines (8,658 km) with 438 intersections within an area of 105 km2. Then, we constrained a deeper portion of the slab surface (40–350 km) using the seismicity distribution. Finally, we interpolated the two parts to obtain a seamless 3D surface highlighting geometric details of the subduction interface, its lateral terminations and down-dip curvature, and a slab tear at 70–100 km depth. Our 3D slab model of the Calabrian Arc will contribute to understanding of the geodynamics of a cornerstone in the Mediterranean tectonic puzzle and estimates of seismic and tsunami hazards in the region.
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