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首页> 外文期刊>Pure and Applied Geophysics >Seismic Noise-Based Strategies for Emphasizing Recent Tectonic Activity and Local Site Effects: The Ferrara Arc, Northern Italy, Case Study
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Seismic Noise-Based Strategies for Emphasizing Recent Tectonic Activity and Local Site Effects: The Ferrara Arc, Northern Italy, Case Study

机译：基于地震噪声的策略，用于强调最近的构造活动和当地现场影响：法拉拉弧，意大利北部，案例研究

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During the seismic crisis of May-June 2012, that strongly affected the central sector of the Ferrara Arc, relevant coseismic effects were observed, such as ground deformations and amplification phenomena due to low quality mechanical characteristics of the shallow subsurface (i.e. few hundreds of meters). This portion of the subsurface is not investigated by neither hydrocarbon explorations (too deep) nor geotechnical surveys (too shallow). Furthermore, direct analysis is not cost effective to carry out over such a wide area. To overcome these limitations, we exploited seismic noise-based strategies, which are not invasive and do not require expensive equipment. We carried out several single-station and array measurements (i.e. ESAC, Re-Mi, and HVSR), across some of the major tectonic structures of the eastern Po Plain, belonging to the most advanced buried sector of the Northern Apennines. Such investigations were performed along two profiles, about 27km-long and oriented SSW-NNE, i.e. almost perpendicular to the regional trend of the Ferrara Arc structures. Our results clearly document lateral shear wave velocity variations and the occurrence of resonance phenomena between 0.52 and 0.85Hz. Additionally, based on inversion procedures, we were able to infer the depth of the resonant interface(s) and we associated such interface(s) to the major known stratigraphic discontinuities, thus emphasizing the recent tectonic activity of the blind thrusts affecting this sector of the Ferrara Arc.
机译：在2012年5月至6月的地震危机期间，强烈影响了法拉拉弧的中央部门，观察到相关的电影效应，如地面变形和放大现象，由于浅地下的低质量机械特性（即几百米） ）。既不是碳氢化合物探索（过于深）也没有调查该部分，也不是岩土工程（太浅）。此外，直接分析不具有在这种广泛的面积上进行的成本效益。为了克服这些限制，我们利用基于地震噪声的策略，这不是侵入性的，不需要昂贵的设备。我们进行了几个单站和阵列测量（即Esac，Re-Mi和HVSR），跨越东部PO平原的一些主要构造结构，属于北亚平地区最先进的埋藏部门。这种研究沿两种型材进行，约27km长，定向的SSW-NNE，即几乎垂直于法拉拉弧结构的区域趋势。我们的结果清楚地记录了横向剪切波速度变化和0.52和0.85Hz之间的共振现象的发生。另外，基于反转程序，我们能够推断谐振界面的深度，以及我们将这种界面相关联的界面到主要已知的地层不连续性，从而强调影响这一部门的盲推力的最近构造活动法拉拉弧。

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