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首页> 外文期刊>Pure and Applied Geophysics >Site response in Las Vegas Valley, Nevada from NTS explosions and earthquake data
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Site response in Las Vegas Valley, Nevada from NTS explosions and earthquake data

机译：NTS爆炸和地震数据在内华达州拉斯维加斯山谷的现场响应

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摘要

We report site response in Las Vegas Valley (LVV) from historical recordings of Nevada Test Site (NTS) nuclear explosions and earthquake recordings from permanent and temporary seismic stations. Our data set significantly improves the spatial coverage of LVV over previous studies, especially in the northern, deeper parts of the basin. Site response at stations in LVV was measured for frequencies in the range 0.2-5.0 Hz using Standard Spectral Ratios (SSR) and Horizontal-Vertical Spectral Ratios (HVR). For the SSR measurements we used a reference site (approximately NEHRP B ``rock'' classification) located on Frenchman Mountain outside the basin. Site response at sedimentary sites is variable in LVV with average amplifications approaching a factor of 10 at some frequencies. We observed peaks in the site response curves at frequencies clustered near 0.6, 1.2 and 2.0 Hz, with some sites showing additional lower amplitude peaks at higher frequencies. The spatial pattern of site response is strongly correlated with the reported depth to basement for frequencies between 0.2 and 3.0 Hz, although the frequency of peak amplification does not show a similar correlation. For a few sites where we have geotechnical shear velocities, the amplification shows a correlation with the average upper 30-meter shear velocities, V-30. We performed two-dimensional finite difference simulations and reproduced the observed peak site amplifications at 0.6 and 1.2 Hz with a low velocity near-surface layer with shear velocities 600-750 m/s and a thickness of 100-200 m. These modeling results indicate that the amplitude and frequencies of site response peaks in LVV are strongly controlled by shallow velocity structure.
机译：我们从内华达试验场（NTS）核爆炸的历史记录以及永久性和临时性地震台站的地震记录中报告了拉斯维加斯谷（LVV）的现场响应。与以前的研究相比，我们的数据集显着提高了LVV的空间覆盖率，特别是在盆地北部，较深的地区。使用标准频谱比（SSR）和水平-垂直频谱比（HVR）测量了LVV中站点在0.2-5.0 Hz范围内的站点响应。对于SSR测量，我们使用了位于盆地外弗朗西曼山（Frenchman Mountain）上的参考地点（大约为NEHRP B``岩石''分类）。 LVV中沉积位点的位点响应是可变的，在某些频率下平均放大率接近10倍。我们观察到站点响应曲线中的峰值集中在0.6、1.2和2.0 Hz附近，其中一些站点在更高的频率处显示出更低的振幅峰值。尽管峰值扩增的频率没有显示出相似的相关性，但对于0.2至3.0 Hz之间的频率，位点响应的空间模式与所报道的至基底的深度高度相关。对于一些具有岩土剪切速度的地点，放大显示出与30米平均上部剪切速度V-30的相关性。我们进行了二维有限差分模拟，并在剪切速度为600-750 m / s，厚度为100-200 m的低速近地表层上，再现了在0.6和1.2 Hz处观察到的峰位放大。这些建模结果表明，LVV中位点响应峰的幅度和频率受浅层速度结构的强烈控制。

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