EVALUATING SEISMIC RISK IN ENGINEERING PRACTICE. PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING, SAN FRANCISCO, 12-16 AUGUST 1985
EVALUATING SEISMIC RISK IN ENGINEERING PRACTICE. PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING, SAN FRANCISCO, 12-16 AUGUST 1985
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发表时间：
1985
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通讯作者：
I. M. Idriss
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作者：
I. M. Idriss
评估地震风险的一个重要因素是评估未来地震可能产生的地震地面运动。为了评估这些运动，需要以下地质和地震输入：（1）未来可能发生地震的震源;（2）每个震源可能发生地震的规模和频率;（3）每个震源相对于场地的距离和方向。这种输入是基于从历史地震活动性研究、地震仪或仪器记录评估以及适当的地质调查中收集的数据。有了这个输入，就可以进行地震危险性评估。本文概述了目前进行这种评价的现有程序，特别强调概率的使用。概率性地震危险性评估的结果受以下因素的影响：（a）复发关系;（B）每个震源的最大震级;（c）震级-破裂长度（或面积）关系;（d）距离（从场地到震源）概率分布函数;（e）衰减关系。还介绍了计算特殊纵坐标的程序。从实践中的例子进行了描述，其中包括在安克雷奇，阿拉斯加州的两个网站的风险评估。会议摘要见IRRD 287689。（TRRL）
An important element in evaluating seismic risk is the evaluation of the earthquake ground motions likely to be generated during future earthquakes. To evaluate these motions, the following geologic and seismologic input is needed: (1) seismic sources on which future earthquakes are likely to occur; (2) size of possible earthquake and frequency with which an earthquake is likely to occur on each source; and (3) distance and orientation of each source with respect to the site. This input is based on data gathered from studies of historical seismicity, evaluation of seismographic or instrumental records, and appropriate geologic investigations. With this input a seismic hazard evaluation can be performed. The procedures available at present for conducting this evaluation are outlined with special emphasis on the use of probabilities. The results of a probabilistic seismic hazard evaluation are influenced by (a) the recurrence relationship; (b) maximum magnitude derived for each source; (c) magnitude-rupture length (or area) relationship; (d) distance (from site to source) probability distribution function; and (e) attenuation relationship. Procedures for calculating special ordinates are also presented. Examples from practice are described, among them the evaluation of risk at two sites in Anchorage, Alaska. For the covering abstract of the conference see IRRD 287689. (TRRL)