首页> 外文期刊>Pure and Applied Geophysics >The Effect of Velocity Inversions on H/V
【24h】

The Effect of Velocity Inversions on H/V

机译:速度反转对H / V的影响

获取原文
获取原文并翻译 | 示例
           

摘要

We analyzed the phenomenology of microtremor H/V curves under inversions in the shear-wave velocity (Vs) profile in the subsoil. Under no Vs inversion the spectral signature of the H/V peaks is found to be ‘eye-shaped’ with the horizontal components higher than the vertical. Conversely, under negative velocity gradients, numerous of differences emerge. I) A H/V ratio below 1 is observed for a wide range of frequencies, due to the decrease of the horizontal components below the vertical one. II) In the presence of persistent H/V 2 SESAME (2004) criterion fails but a stratigraphic interpretation may still be possible. III) The H/V curves should always be interpreted together with the single component spectra. IV) Microtremor H/V measurements for stratigraphic/microzonation purposes on stiff artificial soils, (asphalt, concrete, cement, pavements) should always be avoided since the latter often produce velocity inversions. This may have consequences in the intermediate to high frequency domain ( > 1 Hz) also in the application of reference site methods, like Hsite/Hbedrock, to microtremor. Theoretical modeling confirms these experimental findings. Keywords Microtremor - H/V - Velocity inversion
机译:我们分析了地下土的剪切波速度(V s )剖面反演下的微震H / V曲线的现象学。在没有V s 反转的情况下,发现H / V峰的光谱特征为“眼形”,其水平分量高于垂直分量。相反,在负速度梯度下,会出现许多差异。 I)由于水平分量减少到垂直分量以下,因此在宽范围的频率下均观察到H / V比低于1。 II)在持续存在H / V 2 SESAME(2004)准则的情况下,但地层解释仍然可能。 III)H / V曲线应始终与单组分光谱一起解释。 IV)应始终避免在坚硬的人造土壤(沥青,混凝土,水泥,路面)上进行用于地层/微区划的微震H / V测量,因为后者经常会产生速度倒转。这也可能在中高频范围(> 1 Hz)中产生影响,也可能是将参考点方法(例如H site / H bedrock )应用于微震的结果。理论模型证实了这些实验结果。关键词微震-H / V-速度反演

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号