Analysis on background weak seismic signals in Yunnan, China
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摘要: 利用云南省地震台网44个台站记录的2008年1——9月连续波形数据进行互相关计算, 得到了台站间的格林函数，并获取对应的频散曲线，据此分析了该地区的区域背景弹性波场的来源及分布．研究发现，该地区的区域背景弹性波场有着明显的方向性，15 s信号的总体传播方向是从东南向西北，也就是说主要来自云南省的东南方向，据此推测区域背景弹性波场可能与中国南海或者南太平洋的海洋活动有关.另外该地区的区域背景弹性波场有着明显的季节性变化，其中6——9月份的能量较强．对比中国大陆风力分布发现，该信号与区域台站附近及台站间的风力没有明显关系．
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关键词:
- 环境噪声 背景信号 互相关 频散曲线
Abstract: Using 9 months waveform data recorded at 44 seismic stations of Yunnan seismic network during 2008, we obtained Greenrsquo;s functions between the stations with cross-correlation analysis, and then retrieved wave dispersion curves from the Greenrsquo;s functions. Using the Greenrsquo;s functions and dispersion curves, we analyzed the sources of the regional background weak signals. The Greenrsquo;s functions show that the background weak signals in a period of 15s propagated from southeast to northwest in the Yunnan province. The azimuthal variation of the signals implies that they may be related to the effect of oceanic waves in South China Sea or southern Pacific ocean. The background signals show a seasonal variation, with the strongest signals appeared between June and September in a year. Comparing the signals with wind data, we could not find any relation between them. -
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