...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Seismological research letters >Vs30: Proxy for Seismic Amplification Silvia Castellaro, Francesco Mulargia, and Piermaria Luigi Rossi
【24h】

Vs30: Proxy for Seismic Amplification Silvia Castellaro, Francesco Mulargia, and Piermaria Luigi Rossi

机译：Vs30：地震放大的代理Silvia Castellaro，Francesco Mulargia和Piermaria Luigi Rossi

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The seismic codes of many countries base their site classifications on the Vs30 parameter, i.e., the average shear-wave velocity in the first 30 m of subsoil. And yet, despite the widespread use of this parameter, there is not universal agreement that this is a valid proxy for seismic amplification. There is no doubt that since the shear-wave subsoil velocity (Vs) is tied to soil rigidity, the profile of the former must have a role in site effects (Shearer and Orcutt 1987; Cranswick et al. 1990). However, seismic amplification appears too complex to be related to the Vs profile in the fir st 30 m alone. Harmsen (1997) showed largely scatter ed Vs30 site amplification plots and concluded that source directivity and topography also may play a role in site amplification. Hartzell etal, (2001) found a correlation between Vs30 and site amplification, but their conclusion is based on only four Vs30 values (measured only down to 16-17 m and extrapolated to 30 m), all falling in areas of little or no amplification, They did not perform a statistical correlation based on several data equally distributed among all site classes. Boore (2004) concluded that the National Earthquake Hazard Reduction Program (NEHRP) soil classes are a useful way of grouping sites according to site amplification. However, Boore's work involved only class C and D sites, with one exception. Wald and Mori (2000) and Mucciarelli and Gallipoli (2006) raised doubts about the validity of Vs30 as a proxy to soil amplification in tectonically active complex regions or in particular geological settings, such as in the presence of inversions in the Vs velocity profiles (Di Giacomo et al. 2005). Finally, Frankel et al. (2002) and Park and Hashash (2004) illustrated the role of amplification from the deeper (> 30 m) sediments.
机译：许多国家/地区的地震法则基于Vs30参数（即地下30 m的平均剪切波速度）进行场地分类。然而，尽管该参数得到了广泛使用，但尚未达成普遍共识，认为这是地震放大的有效替代方法。毫无疑问，由于剪切波下层土壤速度（Vs）与土壤刚度有关，因此前者的剖面必定会在场地效应中发挥作用（Shearer and Orcutt 1987; Cranswick et al。1990）。但是，地震放大似乎太复杂，以至于仅与前30 m的Vs剖面无关。 Harmsen（1997）展示了大部分分散的Vs30站点放大图，并得出结论，源方向性和地形也可能在站点放大中起作用。 Hartzell等人（2001年）发现Vs30与位点扩增之间存在相关性，但他们的结论仅基于四个Vs30值（仅测量到16-17 m并外推至30 m），所有值均落在极少或没有扩增的区域，他们没有根据在所有网站类别之间平均分配的几个数据进行统计关联。 Boore（2004）得出结论，根据场地放大，国家地震减灾计划（NEHRP）土壤类别是对场地进行分组的有用方法。但是，Boore的工作仅涉及C和D类场所，只有一个例外。 Wald和Mori（2000）以及Mucciarelli和Gallipoli（2006）对Vs30作为构造活动复杂区域或特别是地质环境中土壤扩增的替代品的有效性提出了疑问，例如在Vs速度剖面中存在反转的情况下（ Di Giacomo等（2005）。最后，Frankel等。 （2002年）以及Park和Hashash（2004年）说明了更深（> 30 m）沉积物的放大作用。

著录项

相似文献

  • 外文文献
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