摘要
针对短时气压波动对体应变观测资料的影响,整理易县台2002～2007年体应变、气压、降水等分钟值资料,并从中选取4个具有明显特征的时间段,采用数字滤波去除原始数据中的长周期成分,用快速傅里叶变换分析体应变的高频谱特征。计算结果表明,短时气压波动对体应变高频谱特征具有显著影响,主要影响周期为53～67 min;在气压平稳情况下,体应变的优势周期相对集中,高频谱幅度最小;而在短时气压波动及降水情况下,体应变的优势周期更趋于分散,体应变响应幅度相对较大。对体应变分钟值资料的高频信息进行分析时,需要采取回归分析、数字滤波等方法消除短时气压波动对体应变观测资料的影响。
Aiming at the influence of short-term atmospheric pressure fluctuation in body-strain observation data,we collate the minute-value of body strain,atmospheric pressure and rainfall observation data,and select four typical periods to remove the long-period component using digital filter and analyse the the spectrum structure characteristics of body strain observational data.The result showed that he short-term atmospheric pressure fluctuation influenced the spectrum structure of the body strain observational data significantly with the main influence cycle from 53 to 67 minute.The dominant periods are relatively concentrated,and spectrum amplitudes are relatively small under the condition of stable atmospheric pressure period.However,the dominant periods are relatively dispersed,and spectrum amplitudes are relatively large under the condition of atmospheric pressure fluctuation.The influence of short-term atmospheric pressure can be decrease through regression analysis and digital filter.
出处
《内陆地震》
2011年第3期255-262,共8页
Inland Earthquake
基金
河北省科技支撑计划(09276904D)
中国地震局"2010年度震情跟踪合同制定向工作任务"项目(2010020703)资助
关键词
体应变
快速傅立叶变换
频谱特征
Body strain
Fast Fourier Transform
Spectrum characteristics
作者简介
马栋（1979～），男（汉族），内蒙林西人，河北省地震局工程师，主要从事地壳形变与地震预测方面的研究工作．E-mail：madong@ep-he.ac.cn
