摘要
利用江苏省南京市六合地震台钻孔体应变2003年1月1日至2008年12月31日的数字化观测资料,对气压和降雨这二种主要干扰因素的基本变化规律进行分析,讨论了发生在该台预报效能范围内的3次中强地震的短临异常特征。结果表明:气压变化在各个季节对观测值均有较大的影响,以短周期的正相关干扰影响为主,在时间上往往表现为准同步,相关系数能达到0.6～0.7以上;降雨对体应变的影响与降雨过程、降雨量及降雨时间等有密切的关系,持续降雨只有积累到一定程度才能促成固体潮畸变,这一过程虽较复杂,但仍有一定的规律可循。六合体应变对区域内中强地震有1～2月的突出短临异常变化。
Based on the digital observation data of borehole volume strain at Liuhe seismic station near Nanjing city,Jiangsu province,from 2003 to 2008,the main disturbance factors as atmospheric pressure and rainfall are analyzed,and the short-imminent abnormality characteristics of the volume strain for 3 earthquakes in the range of predict efficiency are discussed.The results show that the atmospheric pressure in short period affect strongly to value of strain with synchronization on time,the positive correlation coefficient is 0.6～0.7.The effect of rainfall to the strain is complicate,depends on the process,duration time and volume of rain.Only rainfall accumulate to certain volume the solid tide can be distorted.But we still found some features between rainfall and volume strain.The volume strain at Liuhe station had significant short-imminent abnormalies in 1～2 months before regional moderate-strong earthquakes.
出处
《西北地震学报》
CSCD
北大核心
2011年第1期84-90,共7页
Northwestern Seismological Journal
基金
江苏省科技厅社会发展项目(BS2006085)
国家自然科学基金(40901272)
关键词
江苏六合地震台
钻孔体应变
气压
降雨
干扰
短临异常特征
Liuhe seismic station in Jiangsu province
Borehole volume strain
Atmospheric pressure
Rainfall
Disturbance
Short-imminent abnormality
