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精密主动地震监测
引用本文:王洪体,庄灿涛,薛兵,赵翠萍,朱祖杨.精密主动地震监测[J].地球物理学报,2009,52(7):1808-1815.
作者姓名:王洪体  庄灿涛  薛兵  赵翠萍  朱祖杨
作者单位:中国地震局地震预测研究所,北京 100036
基金项目:国家重点基础研究发展规划(973计划),科技部科技支撑项目 
摘    要:借助人工震源,主动探测地下介质结构、并监视其动态变化是地震学家的一个梦想,本文提出的精密主动地震监测(PASM: Precisely and Actively Seismic Monitoring)为实现这一梦想提供了一条可能的途径.本文介绍的精密主动地震监测系统以与GPS保持同步的电子系统控制的旋转质量体作为地震信号源,产生精确的、高度可重复的地震信号,这种信号经过地下介质传播到达观测点被数字地震仪器记录,由专门的计算方法提取,可以获得监视地下介质结构的有效信息,从而实现地下介质结构及物性的主动精确动态监测.其中震源是一种连续震源,工作时对地输入能量强度低,对环境不造成任何破坏性影响,可长期运行,是一种适用范围广泛的绿色震源.以此震源为基础构成的精密主动地震监测系统,配合高灵敏度的数字观测系统,再加上数据处理和信噪比增强技术,可以在150 km以上的距离外得到有效纪录,精确地监视固定路径的精度优于1 ms的走时变化,进而监视地下介质的速度变化和介质参数的变化,是一种前景光明的新型地震学研究方法.

关 键 词:精密控制震源  主动地震监测  信号变换  传递函数  走时时间变化  
收稿时间:2008-4-6
修稿时间:2008-5-28

Precisely and actively seismic monitoring
WANG Hong-Ti,ZHUANG Can-Tao,XUE Bin,ZHAO Cui-Ping,ZHU Zu-Yang.Precisely and actively seismic monitoring[J].Chinese Journal of Geophysics,2009,52(7):1808-1815.
Authors:WANG Hong-Ti  ZHUANG Can-Tao  XUE Bin  ZHAO Cui-Ping  ZHU Zu-Yang
Institution:Institute of Earthquake Science, China Earthquake Administration, 100036 Beijing,China
Abstract:It is a dream for seismologists to explore crustal structures and monitor its temporal variation with artificial seismic sources. The Precisely and Actively Seismic Monitoring(PASM) system introduced in this paper may supply an approach to this dream. It is based on Controlled Accurate Seismic Source(CASS) that generates seismic signal by the rotation of two eccentric masses, while their rotation is accurately controlled by GPS synchronized electronic system, the signal radiated by the source is precise and highly repeatable. This kind of signal is suitable for surveying crustal structures, especially for monitoring the temporal variation of crustal media characteristics. The operation of the source has no harms on the surrounding medium as the energy intensity radiated by it is quite small, it may be operated continuously for long time. The useful data may be obtained at the sites more than 150 km away from source by PASM system which is based on the source, includes highly sensitive digital seismic observation system, special data processing method, and signal to noise ratio improvement method. The accurate travel time temporal variation may be calculated by the cross-correlation of phase waveform group at the accuracy of 10-4~10-5 with the data. In this way, the accurate temporal velocity variation and media parameters may be dynamically monitored. It is a new and prospective technology for seismology.
Keywords:CASS  PASM  Signal transformation  Transfer function  Temporal variation of travel time
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