A Study of the Particle Velocity Recordings, Site ConditionsAnd Radiation Effects for the SE Illinois Earthquake of June 10, 1987

1987 年 6 月 10 日伊利诺伊州东南部地震的粒子速度记录、场地条件和辐射效应研究

• 批准号: 8720851
• 负责人: Ronald Street
• 金额: $ 2.08万
• 依托单位: University of Kentucky
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-15 至 1990-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720851&HistoricalAwards=false
• 关键词: Study; Particle; Velocity; Recordings; Site

The 5.1 mb,Lg southeastern Illinois earthquake of June 10, 1987 triggered 62 blast monitors in the coal mines and limestone and western Kentucky. The resulting set of particle velocity records is the largest sample of free-field ground motions of any earthquake in the central or eastern United States. Corrections for site and source effects in the ground motion traces are shown to reduce the variability in resulting data set. Site effects are based on shallow geotechnical investigations conducted to determine P- and S-wave velocities of the overburden as a function of depth, depth to bedrock, and bedrock topography. Source effects are based on the focal mechanism, focal depth, and type of faulting associated with the June 10th earthquake. The resulting site and source corrected free-field particle velocity records, used in conjunction with random vibration analysis and theoretical considerations, yeild an improved model for predicting seismically induced ground motions in the central United States that has appreciably less variability then existing models.

1987年6月10日发生在伊利诺斯州东南部的5.1兆级地震触发了肯塔基州西部的煤矿、石灰石和62个爆炸监测器。由此产生的一组粒子速度记录是美国中部或东部地震中最大的自由场地面运动样本。在地面运动轨迹中对场地和震源效应的修正可以减少结果数据集的可变性。场地效应基于进行的浅层岩土工程调查，以确定覆盖层的纵波和横波速度作为深度、基岩深度和基岩地形的函数。震源效应基于震源机制、震源深度和与6月10日地震相关的断层类型。由此产生的现场和震源校正自由场粒子速度记录，结合随机振动分析和理论考虑，产生了一个改进的模型，用于预测美国中部地震诱发的地面运动，其可变性明显小于现有模型。