The Lucerne Valley Strong Ground Motion Record from the Lander's Earthquake of June 28, 1992

1992 年 6 月 28 日着陆器地震的卢塞恩谷强地震动记录

• 批准号: 9225154
• 负责人: Wilfred Iwan
• 金额: $ 2.99万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-11-15 至 1994-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9225154&HistoricalAwards=false
• 关键词: Lucerne; Valley; Strong; Ground; Motion

A large number of excellent strong ground motion and structural response accelerograms were recorded during the M 7.5 Landers earthquake of June 28, 1992, which was the largest to occur in California since 1952. There was relatively little damage to engineered structures due to the remote location of the epicenter. However the ground motion records obtained from this event are among the most significant measured to date, and especially the recording from a free-field instrument installed and maintained by the Southern California Edison Co. (SCE). This instrument was located in Lucerne Valley within approximately one mile of the surface rupture, thus providing one of the closest near- field recordings of a major U.S. earthquake. A preliminary analysis of this record shows a very pronounced long-period pulse in the displacement with an amplitude of about 120 cm. This type of ground motion could have a serious effect on the response of large structures. The existence of significant long-period motion in the near-field of a large earthquake has been postulated for some years and analytical models have been proposed to characterize this near-field motion. However there has been insufficient data with which to verify either the existence or the nature of this type of motion. The evidence of significant strongly correlated long-period motion provided by a preliminary analysis of the Lucerne Valley (SCE) record is of very great interest and concern to earthquake engineers. The objective of this project is: (1) to undertake a thorough study of the site, the instrument, and the recorded data so as to determine the accuracy of the Lucerne Valley earthquake record, (2) to develop appropriate correction algorithms for this instrument and to apply these to the measured ground motion record, and (3) to study the characteristics of the Lucerne Valley record any available comparable data to obtain a better understanding of the possible effects of near-field earthquakes on structural response.

1992 年 6 月 28 日发生的 7.5 级兰德斯地震中记录了大量优秀的强地震动和结构响应加速度图，这是自 1952 年以来加利福尼亚州发生的最大地震。由于位置偏远，工程结构受到的损害相对较小的震中。 然而，从该事件中获得的地面运动记录是迄今为止最重要的测量记录之一，尤其是南加州爱迪生公司（SCE）安装和维护的自由场仪器的记录。 该仪器位于距离地表破裂约一英里的卢塞恩山谷，从而提供了美国大地震最近的近场记录之一。 对该记录的初步分析表明，位移中存在非常明显的长周期脉冲，幅度约为120厘米。 这种类型的地面运动可能会对大型结构的响应产生严重影响。 多年来，人们一直假设大地震的近场中存在显着的长周期运动，并提出了分析模型来表征这种近场运动。 然而，还没有足够的数据来验证这种运动的存在或性质。 对卢塞恩谷（SCE）记录的初步分析所提供的显着强相关长周期运动的证据引起了地震工程师的极大兴趣和关注。 该项目的目标是：(1) 对现场、仪器和记录数据进行彻底研究，以确定卢塞恩谷地震记录的准确性，(2) 为该仪器开发适当的校正算法并将这些应用到测量的地面运动记录中，(3) 研究卢塞恩山谷的特征，记录任何可用的可比较数据，以便更好地了解近场地震对结构响应可能产生的影响。