精密可控震源的研制  

The Development of Controlled Accurate Seismic Source

作　　者：刘明辉[1] 周银兴[1] 李江[1] 朱小毅[1] 王洪体[1] 崔仁胜[1] 陈阳[1] 林湛[1] LIU Minghui;ZHOU Yinxing;LI Jiang;ZHU Xiaoyi;WANG Hongti;CUI Rensheng;CHEN Yang;LIN Zhan(Key Laboratory of Earthquake Forecasting,Institute of Earthquake Forecasting,CEA,Beijing 100036,China)

机构地区：[1]中国地震局地震预测研究所地震预测重点实验室,北京市100036

出　　处：《大地测量与地球动力学》2021年第11期1189-1193,共5页Journal of Geodesy and Geodynamics

基　　金：国家重点研发计划(2018YFC1503904-03/06/07);中国地震局地震预测研究所基本科研业务专项(2020IEF1205)。

摘　　要：根据物体围绕原点转圈产生离心力及离心力的合成与抵消原理,采用2台伺服电机同时驱动2个偏心块转动,通过北斗授时的控制系统线性改变伺服电机转动频率,研制出一种精密可控震源,并向地面发出线性调频信号。线性调频信号能量具有良好的聚集性特征,采用Wigner-Hough方法计算其初始频率和调频速率。精密可控震源是一种可长期运行并具有高度重复性的绿色环保震源,可用于探测断层活动性,接收不同深度分界面反射到地面的线性调频信号,定量分析相同路径上波速的时间变化规律,研究断层活动的时空演变特征及其与地震的关系,探索数值地震预报。According to the principle of centrifugal force generated by the object rotating around the origin and the synthesis and counteraction of centrifugal force, two servo motors are used to drive two eccentric masses to rotate at the same time, and linearly change the rotation frequency of the servo motors through the Beidou timing control system, so as to develop a controlled accurate seismic source(CASS), which launches a linear frequency modulation(LFM) signal to the ground. The energy of LFM signal has good aggregation characteristics. We calculate the initial frequency and frequency modulation rate of LFM signal by Wigner-Hough transform. CASS is a kind of green source with long-term operation and high repeatability. It can be applied to monitor the fault activity, receive the LFM signal reflected to the ground from subsurface interface at different depths, quantitatively analyze the temporal variation law of the wave velocity on the same path, study the relationship between spatio-temporal evolution characteristics of the fault activities and the occurrence of earthquake, and explore the numerical earthquake prediction.

关 键 词：精密可控震源 线性调频 初始频率 调频速率 

分 类 号：P315[天文地球—地震学]