漳州地震台阵背景噪声的特性研究

对2007年10~12月在福建省漳州地区进行的勘址观测数据进行了分析,采用了均方根、功率谱、相干函数等方法对漳州地区的地震背景噪声水平进行了研究。研究结果表明,漳州台阵内环半径参考值为510m,外环半径参考值为1700m。滨临海边的台阵勘址测点噪声水平偏高,并在1.5、5.0Hz处发现明显噪声源。1.5Hz噪声源主要来自水库地区的大风引起的水波,5.0Hz噪声源来自台阵场地东北方向的发电厂。

Research of background noise characteristics of the Zhangzhou seismic array

The data recorded during the site survey in the Zhangzhou area in Fujian between October 23,2007 and December 3,2007 was analyzed. The main methods adopted for the noise level of this area are noise root mean square(RMS),noise power spectrum density and noise coherency function. The research result indicates that noise level of the survey sites are higher in 1-10s period,which is the main frequency band of preliminary microseism,and also,two main noise sources were found in 1.5Hz and around 5Hz. According to the arithmetic,the direction and frequency band of the noise source were analyzed and academic proofs were presented. At last,we obtained that the noise source in 1.5Hz was made by the water wave aroused by the wind in the reservoir region and the noise source around 5Hz was made the electric field in north-east direction.