Seismic crosshole tomography as contribution to understand sedimentation processes in glacially-overdeepened valleys
地震跨孔层析成像有助于了解冰川过度加深的山谷中的沉积过程
基本信息
- 批准号:457664566
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Infrastructure Priority Programmes
- 财政年份:
- 资助国家:德国
- 起止时间:
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Glacially-overdeepened valleys and basins constitute major sediment traps. Their structure and their sedimentary succession allow conclusions to be made about the Pleistocene evolution of the Alps. The granted ICDP-project „Drilling Overdeepened Alpine Valleys – DOVE“ aims at these goals by drilling seven locations, distributed throughout the Alpine region, to investigate the spatio-temporal evolution of the glaciations. Applied questions refer to hydrology, geohazards, construction, and tunneling. One piece of the puzzle of overdeepened valleys is to reveal the sedimentation processes during the refill of the troughs. Within these environments, sedimentation processes may generate an anisotropic sedimentological setting. We intend to reveal seismic anisotropy of the sediments and derive the sedimentation processes, as part of the Pleistocene evolution. We hypothesize different mechanisms that lead to seismic anisotropy of the sediments: (1) fine-layering, (2) clast lineation of fluvial sediments, (3) glacio-tectonic overprint, and (4) overconsolidation by glacial loading.To convert the scarce, punctual borehole information into spatially-distributed information, geophysical methods are desirable. Since seismic near-surface methods lack resolution of seismic anisotropy so far, we will investigate the sediments using a seismic crosshole experiment. The targeted study area of this proposed project is the geophysical test site of DOVE in the overdeepened Tannwald Basin (Baden-Württemberg, Germany). It provides a unique opportunity and the ideal setting of three boreholes (ca. 140 m deep) at optimized distances (ca. 30-50 m apart) for a seismic crosshole experiment.For the experiment, we will employ different source systems that are able to generate P-waves as well as differently polarized S-waves. Polarization analysis give evidence of birefringence and direct access to anisotropy and let us identify the arrivals of different wavetypes. The first arrivals of each wavetype are input for isotropic traveltime tomography. Isotropic full waveform inversion will further increase the resolution and accuracy of seismic velocities. In a first step, P-wave and horizontally polarized S-waves will generate velocity models followed by a subsequent full P-SV waveform inversion.Using borehole data, core analysis, and sedimentological interpretation contributed by other DOVE research groups, we will integrate sedimentological and seismic anisotropy to derive sedimentation processes. The findings will be included in a methodical assessment of anisotropic VSP and surface data analysis that can be used at other DOVE locations, where only one borehole is present.
冰川过度加深的山谷和盆地构成了主要的沉积物圈闭。它们的结构和沉积序列使我们能够对阿尔卑斯山的更新世演化作出结论。获得批准的ICDP项目“钻探过度加深的阿尔卑斯山谷- DOVE”旨在通过钻探分布在整个阿尔卑斯地区的七个地点来调查冰川的时空演变来实现这些目标。应用问题涉及水文学、地质灾害、建筑和隧道。过度加深的山谷之谜的一部分是揭示槽再填充期间的沉积过程。在这些环境中,沉积过程可能产生各向异性的沉积学背景。我们打算揭示地震各向异性的沉积物,并推导出沉积过程,作为更新世演化的一部分。我们假设不同的机制,导致地震各向异性的沉积物:(1)精细分层,(2)碎屑线理的河流沉积物,(3)冰川构造叠加,(4)超固结冰川加载。由于地震近地表方法缺乏对地震各向异性的分辨率,我们将使用地震井间实验来研究沉积物。该拟议项目的目标研究区域是过度加深的坦瓦尔德盆地(巴登-符滕贝格,德国)的DOVE地球物理试验场。它提供了一个独特的机会和三个钻孔的理想设置(约。140米深)在优化的距离(约。对于该实验,我们将使用能够产生P波以及不同偏振的S波的不同震源系统。偏振分析给出了双折射的证据,并直接获得各向异性,让我们识别不同波型的到达。每种波型的初至输入各向同性走时层析成像。各向同性全波形反演将进一步提高地震速度的分辨率和精度。首先,P波和水平极化S波将生成速度模型,随后进行完整的P-SV波形反演。利用钻孔数据、岩心分析和其他DOVE研究小组提供的沉积学解释,我们将综合沉积学和地震各向异性来推导沉积过程。调查结果将被纳入各向异性VSP和地面数据分析的系统评估,可用于其他DOVE位置,其中只有一个钻孔。
项目成果
期刊论文数量(0)
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科研奖励数量(0)
会议论文数量(0)
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Dr. Hermann Buness其他文献
Dr. Hermann Buness的其他文献
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{{ truncateString('Dr. Hermann Buness', 18)}}的其他基金
High-resolution 3-D multi-component seismics for an improved structural, facial, and process-related characterisation of glacially overdeepened valleys and basins in the Alps
高分辨率 3-D 多分量地震可改善阿尔卑斯山冰川过深的山谷和盆地的结构、面和过程相关特征
- 批准号:
270342880 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
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