【摘要】 本文采用941B型超低频测振仪及G01通用数采仪,自2009年5月13~27日,在青川县桅杆梁监测到4次余震。对山体斜坡高程805m和875m的余震地震动峰值加速度响应监测结果分析表明:相对于805m高程,875m测点地震动峰值加速度在水平东西向以及垂向均呈减小趋势,而在水平南北向体现显著的放大效应,放大系数可达7~8倍,其FFT主频值主要集中为2~4Hz低频值。分析表明,所监测的微—有感地震震中位于测点北侧的青川断裂上,沿地震波传播方向斜坡体具有显著放大效应作用。更多还原

【Abstract】 From May 13 to 27,2009,the seismic responses of a slope during four aftershocks of the 2008 Wenchuan Earthquake were monitored with the 941-B ultra-low-frequency vibrometer and G01 general-purpose instrument.The slope located at Wei Ganliang in Qingchuang county.The micro-seismic monitoring shows that relative to the 805 m elevation at the Wei Ganliang Mountain,the measured peak accelerations of ground motion at the 875 m elevation in the horizontal EW direction and vertical direction had the tendency of reduction.However,the measured peack accelerations in the horizontal NS direction had a significant multiplier effect.The magnification was up to 7 to 8 times.The main frequency of the amplitude spectrum focused on the low frequency range between 2.0 and 4.0 Hz.Analysis shows that the epicenter located on the north side of the NEE striking Qingchuan-Pingwu fault.Along the direction of seismic wave propagation,the slope has significant an amplification effect.更多还原