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Active Fold‐Thrust Belt to Foreland Transition in Northern Adria, Italy, Tracked by Seismic Reflection Profiles and GPS Offshore Data
Tectonics ( IF 3.3 ) Pub Date : 2020-11-09 , DOI: 10.1029/2020tc006425
G. Pezzo 1 , L. Petracchini 2 , R. Devoti 1 , R. Maffucci 3 , L. Anderlini 4 , I. Antoncecchi 5, 6 , A. Billi 2 , E. Carminati 3 , F. Ciccone 5, 7 , M. Cuffaro 2 , M. Livani 3 , M. Palano 8 , P. Petricca 3 , G. Pietrantonio 1 , F. Riguzzi 1 , G. Rossi 5, 6 , F. Sparacino 8 , C. Doglioni 1, 3
Affiliation  

The Adria microplate is the foreland of the oppositely verging Apennines and Alps or Dinarides fold‐thrust belts associated to the related subduction zones. Along its western margin, the Adria plate hosts the active Northern Apennines accretionary prism, which is buried under the Adriatic Sea and the Po Plain. The interpretation of seismic reflection profiles and borehole data allowed us to define the geometry of the transition from the Apennines fold‐thrust belt to its undeformed foreland. Moreover, continuous GPS (CGPS) data from offshore hydrocarbon platforms anchored to the seabed of the northern Adriatic plate allow to measure present‐day kinematics. Although the CGPS signals are affected by non‐tectonic components associated with hydrocarbon extraction, the integration of geodetic analysis, subsurface geological reconstructions, and analytical modeling allowed us to constrain the ongoing tectonic activity. Shortening is currently accommodated by aseismic slip along the basal detachment, likely accumulating elastic energy along the frontal ramp that may eventually seismically slip. Our multidisciplinary study suggests that the study area may not be sheltered from relevant seismic sequences similar to the Mw 6 Emilia 2012 events and that the occurrence of potential seismogenic sources in the area should be carefully evaluated. Similar studies may be useful to constrain the present‐day activity in other marine areas and to identify potential and hitherto unrecognized seismogenic sources along the entire Apennines belt and other accretionary prisms worldwide.

中文翻译:

地震反射剖面和GPS海上数据跟踪的意大利北部阿德里亚的主动褶皱冲断带向前陆过渡

阿德里亚微孔板是与相关俯冲带相关的相对垂直的亚平宁山脉和阿尔卑斯山或迪纳里德斯褶皱冲断带的前陆。沿其西部边缘,阿德里亚板块拥有活跃的北亚平宁山脉增生棱镜,该棱镜被埋在亚得里亚海和大平原下。地震反射剖面和井眼数据的解释使我们能够定义从亚平宁褶皱冲断带到未变形前陆的过渡的几何形状。此外,来自锚定在北亚得里亚海板块海底的海上油气平台的连续GPS(CGPS)数据可以测量当今的运动学。尽管CGPS信号受与油气开采有关的非构造成分的影响,但大地测量分析,地下地质重建,分析模型使我们能够限制正在进行的构造活动。目前,缩短是由沿基底分离的抗震滑移来解决的,可能是沿前斜坡积聚了弹性能,最终可能会发生地震滑移。我们的多学科研究表明,与Mw 6 Emilia 2012事件类似,研究区域可能无法避开相关的地震序列,因此应仔细评估该区域潜在震源的发生。类似的研究可能对限制当今在其他海洋地区的活动,以及在整个亚平宁山脉和全球其他增生棱镜上查明潜在的和迄今尚未发现的地震源有用。目前,缩短是由沿基底分离的抗震滑移来解决的,可能是沿前斜坡积聚了弹性能,最终可能会发生地震滑移。我们的多学科研究表明,与Mw 6 Emilia 2012事件类似,研究区域可能无法避开相关的地震序列,因此应仔细评估该区域潜在震源的发生。类似的研究可能对限制当今在其他海洋地区的活动,以及在整个亚平宁山脉和全球其他增生棱镜上查明潜在的和迄今尚未发现的地震源有用。目前,缩短是由沿基底分离的抗震滑移来解决的,可能是沿前斜坡积聚了弹性能,最终可能会发生地震滑移。我们的多学科研究表明,与Mw 6 Emilia 2012事件类似,研究区域可能无法避开相关的地震序列,因此应仔细评估该区域潜在震源的发生。类似的研究可能对限制当今在其他海洋地区的活动,以及在整个亚平宁山脉和全球其他增生棱镜上查明潜在的和迄今尚未发现的地震源有用。我们的多学科研究表明,与Mw 6 Emilia 2012事件类似,研究区域可能无法避开相关的地震序列,因此应仔细评估该区域潜在震源的发生。类似的研究可能对限制当今在其他海洋地区的活动,以及在整个亚平宁山脉和全球其他增生棱镜上查明潜在的和迄今尚未发现的地震源有用。我们的多学科研究表明,与Mw 6 Emilia 2012事件类似,研究区域可能无法避开相关的地震序列,因此应仔细评估该区域潜在震源的发生。类似的研究可能对限制当今在其他海洋地区的活动,以及在整个亚平宁山脉和全球其他增生棱镜上查明潜在的和迄今尚未发现的地震源有用。
更新日期:2020-11-15
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