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首页> 外文期刊>Journal of Earthquake Engineering >ON THE RESOLUTION OF H/V MEASUREMENTS TO DETERMINE SEDIMENT THICKNESS, A CASE STUDY ACROSS A NORMAL FAULT IN THE LOWER RHINE EMBAYMENT, GERMANY
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ON THE RESOLUTION OF H/V MEASUREMENTS TO DETERMINE SEDIMENT THICKNESS, A CASE STUDY ACROSS A NORMAL FAULT IN THE LOWER RHINE EMBAYMENT, GERMANY

机译：关于确定沉积物厚度的H / V测量值的解决方案，以德国下莱茵河路堤的正常断层为例

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In recent years, H/V measurements have been increasingly used to map the thickness of sediment fill in sedimentary basins in the context of seismic hazard assessment. This parameter is believed to be an important proxy for the site effects in sedimentary basins (e.g. in the Los Angeles basin). Here we present the results of a test using this approach across an active normal fault in a structurally well known situation. Measurements on a 50 km long profile with 1 km station sparing clearly show a change in the frequency of the fundamental peak of H/V ratios with increasing thickness of the sediment layer in the eastern part of the Lower Rhine Embayment. Subsequently, a section of 10 km length across the Erft-Sprung system, a normal fault with ca. 750 m vertical offset, was measured with a station distance of 100 m. Frequencies of the first and second peaks and the first trough in the H/V spectra are used in a simple resonance model to estimate depths of the bedrock. While the frequency of the first peak shows a large scatter for sediment depths larger than ca. 500 m, the frequency of the first trough follows the changing thickness of the sediments across the fault. The lateral resolution is in the range of the station distance of 100 m. A power law for the depth dependence of the S-wave velocity derived from down hole measurements in an earlier study [Budny, 1984] and power laws inverted from dispersion analysis of micro array measurements [Scherbaum et al, 2002] agree with the results from the H/V ratios of this study.
机译：近年来，在地震危险性评估的背景下，越来越多地使用H / V测量来绘制沉积盆地中的沉积物厚度图。该参数被认为是沉积盆地（例如在洛杉矶盆地）的场地效应的重要代表。在这里，我们介绍了在结构上众所周知的情况下，使用这种方法对活动正常断层进行测试的结果。在50 km长的剖面图上保留了1 km的站距，清楚地显示出H / V比的基本峰值的频率随下莱茵河谷东部的沉积层厚度增加而变化。随后，整个Erft-Sprung系统有一段10 km的长度，这是一个正常的断层，约为在站点距离为100 m的情况下测量了750 m的垂直偏移。 H / V谱中的第一峰和第二峰的频率以及第一谷的频率在简单的共振模型中用于估算基岩的深度。当第一个峰值的频率显示出较大的散射时，沉积物的深度大于约。在500 m处，第一槽的频率跟随断层上沉积物厚度的变化。横向分辨率在站点距离100 m的范围内。较早的研究[Budny，1984]从井下测量得出的与S波速度的深度相关的幂定律和微阵列测量的色散分析[Scherbaum等，2002]得出的幂定律与这项研究的H / V比。

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