城市沉积盆地基岩形态的地球物理调查和三维建模:博尔扎诺(意大利北部)案例

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-05-30 DOI:10.1007/s00024-024-03512-1
Sgattoni Giulia, Morelli Corrado, Lattanzi Giovanni, Castellaro Silvia, Cucato Maurizio, Chwatal Werner, Mair Volkmar
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引用次数: 0

摘要

绘制基岩图对于了解地震放大作用至关重要,尤其是在充满沉积物的山谷或盆地。然而,在城市环境中却很难做到这一点。我们对意大利北部充满沉积物的博尔扎诺盆地进行了地球物理调查,那里有三个山谷交汇。这项研究采用了适用于城市地区的低影响、单站地球物理方法,以应对在此类环境中绘制地图所面临的挑战。由 574 个微震和重力测量数据集以及三条地震反射线组成的数据集,即使没有直接的地层数据,也能推断出盆地深部基岩的形态。数据集有助于详细分析共振频率和振幅的空间模式,揭示共振的一维和二维特征。值得注意的是,二维共振主要集中在阿迪杰河谷沿岸,即深度达 900 米的盆地最深处。这些二维共振无法通过简单的一维频率-深度关系来解释,通过整合重力数据建立深度模型,可以更好地理解这些共振。研究确定了博尔扎诺从 0.27 赫兹到超过 3 赫兹的共振频率,在地震中影响不同类型的建筑。最大共振振幅出现在较低频率,特别是在二维共振点,因此主要影响高层建筑。二维共振具有方向性,沿山谷轴线的纵向共振幅度最大。由此产生的三维基岩模型有助于地震现场响应建模、水文地质研究和地热勘探,并有助于深入了解盆地的地质历史,突出阿迪杰河谷作为主要排水通道的作用。
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Geophysical Investigation and 3D Modeling of Bedrock Morphology in an Urban Sediment-Filled Basin: The Case of Bolzano (Northern Italy)

Bedrock mapping is essential for understanding seismic amplification, particularly in sediment-filled valleys or basins. However, this can be hard in urban environments. We conducted a geophysical investigation of the sediment-filled Bolzano basin in Northern Italy, where three valleys converge. This study uses low-impact, single-station geophysical methods suitable for urban areas to address the challenges of mapping in such environments. A dataset of 574 microtremor and gravity measurements, along with three seismic reflection lines, allows for the inference of the basin’s deep bedrock morphology, even without direct stratigraphic data. The dataset facilitates a detailed analysis of the spatial patterns of resonance frequencies and amplitudes, revealing 1D and 2D characteristics of the resonances. Notably, 2D resonances predominate along the Adige valley, i.e., the deepest part of the basin with depths up to 900 m. These 2D resonances, which cannot be interpreted through simple 1D frequency-depth relationships, are better understood by integrating gravity data to develop a depth model. The study identifies resonance frequencies ranging from 0.27 to over 3 Hz in Bolzano, affecting different building types during earthquakes. Maximum resonance amplitudes occur at lower frequencies, specifically at 2D resonance sites, therefore primarily impacting high structures. The 2D resonances are directional, with the most significant amplification occurring longitudinally along the valley axes. The resulting 3D bedrock model aids in seismic site response modeling, hydrogeological studies, and geothermal exploration and provides insights into the geological history of the basin, highlighting the role of the Adige Valley as a major drainage pathway.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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