Hagedoorn's plus‐minus method: the beauty of simplicity
Hagedoorn's plus‐minus method: the beauty of simplicity
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DOI：
10.1111/j.1365-2478.1964.tb01888.x
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发表时间：
1964-03
影响因子：
2.6
通讯作者：
R.A. Van Overmeeren
中科院分区：
文献类型：
--
作者：
R.A. Van Overmeeren
Hagedoorn开发了加减方法，目的是为勘探界提供一种简单快速的近似Thornburgh波前重建方法。简单的加法和减法产生所有检波器的深度和速度，其中来自一组相互激发的折射波是初至波。尽管在过去的几十年里，地震折射法没有跟上反射技术的革命性进步，但该方法仍然可以提供很多东西，特别是在浅层工程以及环境、地下水和海床测量方面。它的优点是易于应用，成本低，在浅层有效，能够提供最深折射层的详细速度信息，并能够生成地层和岩石特征参数。由于其简单性，加减法非常适合在野外对折射数据进行真实的实时处理，从而监控数据质量和最佳炮点配置。如今，这种现场处理可以通过笔记本电脑和专用软件轻松执行。matlab®是一个软件包，可以进行定制处理，提供编程语言，可视化工具和大型现成函数库的组合。本文介绍了一个在matlab中开发的加减程序，并以也门的一个案例研究为例说明了其应用，在也门，地震折射被用于区域地下水研究。在这里，折射不仅提供了沿海平原补给区的详细剖面，而且还提供了在解释该地区垂直电测深时减少模糊性所需的额外信息。
Hagedoorn developed the plus‐minus method with the objective of providing the exploration world with a simple and rapid approximation of Thornburgh's wavefront reconstruction method. Straightforward adding and subtracting produces depths and velocities at all geophones where the refracted waves from a set of reciprocal shots are first arrivals. Even though seismic refraction has not kept up with the revolutionary advance of reflection technology during the past decades, the method still has a lot to offer, especially in shallow engineering, and environmental, groundwater and sea‐bed surveying. Its strong points are the ease of application, the low costs, the effectiveness in the shallow zone, the unique ability to provide detailed velocity information on the deepest refractor and the capability for producing parameters for layer and rock characterization.Because of its simplicity, the plus‐minus method is ideally suited for real‐time processing of refraction data in the field, thus monitoring the data quality and the optimal shot configuration. Today, such field processing is easily performed with a laptop and dedicated software. matlab® is a software package that enables tailor‐made processing, offering a combination of a programming language, visualization tools and a large library of ready‐made functions. This paper presents a plus‐minus program developed in matlab and illustrates its application with a case study in Yemen, where seismic refraction was used in a regional groundwater study. Here, refraction provided not only a detailed section across the recharge area of a coastal plain but also the additional information needed to reduce ambiguity in the interpretation of the vertical electrical soundings made in the area.