摘要
利用减组合滤波方法对2008—2013年云南省内7次M≥5.5地震前3个月10个台站的水管倾斜观测资料进行处理,消除潮汐改正成分和零漂,探寻短临同步异常变化。结果表明,减组合滤波方法提取的高频成分,在震前存在同步异常,可尝试用于短临跟踪工作中;利用"Nakai拟合模型"求解得到潮汐响应率和线性漂移速率在短临阶段均未表现出易识别的异常,其反映的信息尚需进一步挖掘。
Using the reducing combination filtering method, we processed the water tube tilt observation data recorded by 10 stations in Yunnan within 3 months before 7 times of M≥5. 5 earthquakes since 2008,and eliminated the tidal correction and zero drift to look for the synchronous abnormal changes in the short - term and imminent sta- ges. The results showed that after extracting the high frequency component by reducing combination filtering method,we found that the synchronous abnormal changes were widespread before earthquakes, which could be applied in short- term tracking. The tidal response rate and linear drift rate which were solved by Nakai fitting model did not show the easy identified anomalies in short- term and imminent stages, which reflecting informa- tion needs to be further explored.
出处
《地震研究》
CSCD
北大核心
2017年第1期82-87,共6页
Journal of Seismological Research
基金
星火计划项目"基于典型磁电
形变前兆异常识别的短临预测研究与应用"(XH13022)
云南省地震局传帮带项目"云南前兆观测资料及在地震预报中的应用"(C2-2014002)
大震短临跟踪项目--云南6级以上地震短临异常指标总结(2014JCYB04)联合资助
关键词
减组合滤波
Nakai拟合
水管倾斜
短临异常
reducing combination filtering
Nakai fitting
water tube tilt
short - term and imminent stages
