地震地磁观测与研究2011，Vol.32Issue(2)：34-41,8.DOI:10.3969/j.issn.1003-3246.2011.02.007
利用高采样率数采实现地震波速变化高精度测量
Implementation of high precision measurement of seismic velocity change using high sample rate data-acquisition system
摘要
Abstract
Physical properties of the medium as well as its stress status change are the main factors that causes seismic velocity change, thus variations in the medium can be speculated by monitoring velocity change. However, precision of the measurement is usually affected by sample rate, SNR of the instruments and time triggered precision. With the purpose of realize high precision measurement, we designed a set of monitoring system, which includes a highpowered rare-earth giant magnetostrictive source and a general data-acquisition system with high sample rate. We used stacking to increase SNR, and enhanced the trigger precision by increasing the sample rate. Meanwhile, we used the near-field data for correction, so as to eliminate the instrument effects on seismic velocity change. The practical observation suggests that our system can obviously decrease time error, and realize high precision measurement of seismic velocity.关键词
波速变化/信噪比/采样率/触发精度Key words
velocity change, SNR, sample rate, trigger precision引用本文复制引用
李宜晋,辛维,王宝善,葛洪魁,杨微,徐平..利用高采样率数采实现地震波速变化高精度测量[J].地震地磁观测与研究,2011,32(2):34-41,8.基金项目
国家自然科学基金"地下介质变化四维地震监测关键技术和理论的实验研究",基金号40874095 （）
地震行业科研专项经费"地震波走时变化的主动源监测技术研究",基金号200808002 （）
中央级公益性科研院所基本科研业务专项,基金号DQJB09A01 （）
