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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Depth-Recursive Tomography of the Bohemian Massif at the CEL09 Transect-Part A: Resolution Estimates and Deblurring Aspects
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Depth-Recursive Tomography of the Bohemian Massif at the CEL09 Transect-Part A: Resolution Estimates and Deblurring Aspects

机译：CEL09断面处的波西米亚断层的深度递归层析成像，A部分：分辨率估计和去模糊方面

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摘要

The refraction CEL09 profile from the CELEBRATION 2000 project intersects the main terranes of the Bohemian Massif in the NW-SE direction: the Saxothuringian, the Teplá-Barrandian, the Moldanubian and the Moravo-Silesian. In its easternmost part, it crosses the Western Outer Carpathians overthrust westward onto the Bohemian Massif. Only the first 450 km were surveyed with the densest deployment of shot points providing data suitable for a reliable geological interpretation. The first-arrival depth-recursive tomography was applied here to derive a P-wave velocity image of the upper and middle crust (Part A). The proper interpretation of the obtained velocity features is the subject of the accompanying paper (Part B). The attained resolution in the velocity image is shown to be superior as compared with the previous CEL09 models based also on the more uncertain later arrivals of reflection waves. The applied DRTG (depth-recursive tomography on grid) method is based on a regular network of refraction grid rays generated for iteratively updated starting models. Only the distinct first arrivals with minimum uncertainty are used for the DRTG inversions to yield the maximum resolution. Thanks to the full control of the data fit by the grid rays used, the statistical lateral resolution could be determined at single grid depths for the chosen confidence levels. Thus, the lateral sizes of the anomalies that can be yet resolved are determined in dependence on their depths and their velocity excesses. The defocusing of the imaged features is studied on the basis of the spatial responses to spike excitation. The calculated spatial responses also allowed the edge smearing of the velocity anomalies to be assessed. Special attention is paid to the imaging of low-velocity zones that are usually suppressed by the smoothing measures used in standard tomographic methods. An improvement was achieved if the smoothing was suggested with regard to the occurrence of the low-velocity zones repeatedly appearing in higher iterations. The gained deblurring effect concerns both the negative and positive anomalies as documented on the velocity features interpreted in the accompanying paper.
机译：来自CELEBRATION 2000项目的折射CEL09剖面在NW-SE方向与波西米亚断层的主要地层相交：萨克斯图林根，特普拉-巴兰迪安，摩尔达努比和摩拉沃-西里西亚。在最东端，它穿过西喀尔巴阡山脉上覆岩层，向西西推，进入波希米亚地块。仅对最初的450公里进行了调查，并采用了最密集的射击点来提供适合进行可靠地质解释的数据。在此应用首次到达深度递归层析成像，以得出上地壳和中地壳的P波速度图像（A部分）。对获得的速度特征的正确解释是随附论文的主题（B部分）。与以前的CEL09模型相比，在速度图像中获得的分辨率也显示出更高的分辨率，这也是基于较不确定的后来反射波的到来。应用的DRTG（网格上的深度递归层析成像）方法基于为迭代更新的起始模型生成的常规折射网格射线网络。 DRTG反演仅使用具有最小不确定性的独特初次到达来获得最大分辨率。由于所使用的栅格射线完全控制了数据拟合，因此可以针对所选置信度在单个栅格深度确定统计横向分辨率。因此，可以根据异常的深度和速度超出来确定可以解决的异常的横向尺寸。基于对尖峰激发的空间响应，研究了成像特征的散焦。计算出的空间响应还允许评估速度异常的边缘拖尾。特别注意通常在标准层析成像方法中使用的平滑措施所抑制的低速区域的成像。如果建议对在较高迭代中反复出现的低速区域的出现进行平滑处理，则可以实现改进。获得的去模糊效果涉及到负异常和正异常，这在随附的论文中解释了速度特征。

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