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

大量优秀的强地震动和 结构响应加速度记录在 1992年6月28日兰德斯7.5级地震， 是自1952年以来加州发生的最大规模的地震。 那里 对工程结构的破坏相对较小， 到震中的偏远地区 然而 从这次地震中获得的地面运动记录是 是迄今为止最重要的衡量指标之一， 尤其是自由场仪器的记录 由南加州安装和维护 爱迪生公司（SCE）。 该仪器位于 卢塞恩山谷，距离 表面破裂，从而提供了一个最接近的， 美国大地震的现场记录 一 对这一记录的初步分析表明， 位移中明显的长周期脉冲， 振幅约为120 cm。 这种地面 运动可能会对反应产生严重影响， 大型结构。 大尺度长周期运动的存在， 大地震的近场已经被假定为 几年来，已经提出了分析模型， 描述这种近场运动。 然而， 没有足够的数据来验证 这种运动的存在或性质。 的 证据表明，长期的 初步分析提出的动议， 卢塞恩谷（SCE）的记录是非常感兴趣的 和地震工程师的关注。 该项目的目标是：（1）开展一项 对场地、仪器和 记录的数据，以确定的准确性 卢塞恩河谷地震记录，（2）发展 本仪器的适当校正算法 并将其应用于测量的地面运动 记录;（3）研究 卢塞恩山谷记录任何可用的可比数据， 更好地了解可能产生的影响 近场地震对结构响应的影响

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.