摘要
城市扩张和人类活动所带来的环境干扰已经越来越严重地影响到地震监测,给地震参数的确定和其他地球物理研究造成不确定性。本研究以处于高环境噪声的防灾地震台记录的2008年5月12日汶川地震波形资料为例,给出如何采用数字信号处理手段从强干扰环境下提取到地震波有效信号,并按方位角和出射角方向对地震信号各分向信号进行了分解与组合,最后归纳出提取有效信号的一般过程。
As expand of cities and intension of human activities,earthquake monitoring has become more and more disturbed by the environmental noise.This interfere the determination of earthquake parameters and other geophysical phenomenon study.Based on the seismic wave data of Wenchuan earthquake on May 12,2008 recorded by the Fangzai seismic station at the high environmental noise,we present the method of how to extract the effective seismic wave signal from the strong environment noise by means of the digital signal processing.Based on the direction of the azimuth angle and the emergence angle,we recombine the signal of 3components of the seismic wave record to identify the first arrivals of seismic wave.Finally,we summarize the general process of extracting the effective seismic signal.
出处
《华北地震科学》
2011年第1期6-9,共4页
North China Earthquake Sciences
关键词
强干扰
频谱分析
数字滤波
射线坐标系
strong interference
spectrum analysis
digital filter
ray coordinates
