...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earthquake Engineering & Structural Dynamics >An attenuation model for distant earthquakes
【24h】

An attenuation model for distant earthquakes

机译：远处地震的衰减模型

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

Large magnitude earthquakes generated at source-site distances exceeding 100 km are typified by low-frequency (long-period) seismic waves. Such induced ground shaking can be disproportionately destructive due to its high displacement, and possibly high velocity, shaking characteristics. Distant earthquakes represent a potentially significant safety hazard in certain low and moderate seismic regions where seismic activity is governed by major distant sources as opposed to nearby (regional) background sources. Examples are parts of the Indian sub-continent, Eastern China and Indo-China. The majority of ground motion attenuation relationships currently available for applications in active seismic regions may not be suitable for handling long-distance attenuation, since the significance of distant earthquakes is mainly confined to certain low to moderate seismicity regions. Thus, the effects of distant earthquakes are often not accurately represented by conventional empirical models which were typically developed from curve-fitting earthquake strong-motion data from active seismic regions. Numerous well-known existing attenuation relationships are evaluated in this paper, to highlight their limitations in long-distance applications. In contrast, basic seismological parameters such as the Quality factor (Q-factor) could provide a far more accurate representation for the distant attenuation behaviour of a region, but such information is seldom used by engineers in any direct manner. The aim of this paper is to develop a set of relationships that provide a convenient link between the seismological Q-factor (amongst other factors) and response spectrum attenuation. The use of Q as an input parameter to the proposed model enables valuable local seismological information to be incorporated directly into response spectrum predictions. The application of this new modelling approach is demonstrated by examples based on the Chi-Chi earthquake (Taiwan and South China), Gujarat earthquake (Northwest India), Nisqually earthquake (region surrounding Seattle) and Sumatran-fault earthquake (recorded in Singapore). Field recordings have been obtained from these events for comparison with the proposed model. The accuracy of the stochastic simulations and the regression analysis have been confirmed by comparisons between the model calculations and the actual field observations. It is emphasized that obtaining representative estimates for Q for input into the model is equally important. Thus, this paper forms part of the long-term objective of the authors to develop more effective communications across the engineering and seismological disciplines.
机译：在震源点距离超过100 km时产生的大地震，以低频（长周期）地震波为代表。由于其高位移以及可能的高速度振动特性，这种诱发的地面振动会造成极大的破坏性。在某些中低地震区，远距离地震表示潜在的重大安全隐患，那里的地震活动是由主要的远距离震源而不是附近（区域）背景震源控制的。例如印度次大陆，华东和印度支那部分地区。当前可用于主动地震区域的大多数地面运动衰减关系可能不适合处理长距离衰减，因为远距离地震的意义主要限于某些中低地震度地区。因此，传统的经验模型通常不能准确地表示远处地震的影响，这些经验模型通常是根据活动地震区域的曲线拟合地震强运动数据开发的。本文评估了许多众所周知的现有衰减关系，以突出它们在长距离应用中的局限性。相反，基本地震学参数（例如品质因数（Q因子））可以为区域的远距离衰减行为提供更为准确的表示，但是工程师很少以任何直接方式使用此类信息。本文的目的是开发一组关系，以提供地震Q因子（以及其他因素）与响应谱衰减之间的便捷链接。使用Q作为拟议模型的输入参数，可以将有价值的局部地震信息直接纳入响应谱预测中。这种新的建模方法的应用通过以下例子得到了证明：基于Chi-Chi地震（台湾和中国南方），Gujarat地震（印度西北），Nisqually地震（西雅图周边地区）和苏门答腊断层地震（在新加坡记录）。从这些事件中获得了现场记录，以便与提出的模型进行比较。随机模拟和回归分析的准确性已经通过模型计算和实际现场观测之间的比较得到了证实。要强调的是，获得Q的代表性估计值以输入模型同样重要。因此，本文构成了作者长期目标的一部分，目的是在工程学和地震学学科之间发展更有效的交流。

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