内蒙古中部地区形变主要干扰的时频响应特征分析

Analysis of Time-Frequency Response Characteristics for Main Deformation Disturbances in Central Inner Mongolia

摘要:

选取内蒙古中部地区定点形变观测中受降雨、大风、气压干扰以及地震波影响的典型数据，采用S变换，对该地区形变观测中4种主要干扰信号的时频响应特征进行分析与讨论。结果表明，降雨干扰信号主要集中在低频区域，其频率先增大后减小；大风干扰表现为高频干扰，时频域能量强度与观测曲线受风扰影响变化幅度成正比；气压干扰信号的优势频率分布在低频段内；地震波影响中VP垂直摆和JCZ地震计记录的地震波较为相似，但VP垂直摆记录的频段要小于JCZ地震计，VP垂直摆主要记录的是低频地震波。同时，4种干扰信号的时频域频率、能量强度随时间变化趋势与数据观测时域变化趋势相一致。

Abstract:

Based on the S-transform,the typical data affected by rainfall,gale,barometric pressure and seismic wave in fixed deformation observation are used to analyze and discuss the the time-frequency response characteristics of the four main interference of deformation in central Inner Mongolia. The results show that:the rainfall interference is distributed in low frequency band,and its frequency increases first and then decreases. The gale interference is distributed in high frequency band,and its the energy intensity in time-frequency domain is proportional to the variation range of the observation curve affected by the gale interference. The dominant frequency of barometric interference signal is distributed in the frequency;the VP vertical pendulum and the JCZ seismometer record similar seismic waves,but the frequency band of VP vertical pendulum record is less than that of JCZ seismometer,and the VP vertical pendulum mainly records low frequency seismic wave. Also,the variation of frequency and energy intensity with time of the four interference factors is consistent with that of the observation curve with time in time domain.