六合体应变干扰因素与地震短临异常特征研究
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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.
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.
引文
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[2]高福旺,李丽,牛安福,等.对体应变干扰因素的识别及排除[J].地震,2004,24(增刊):90-97.
[3]杜品仁.气压变化及其对壳形变和深井水位的影响[J].地球物理学报,1991,34(1):73-81.
[4]陆明勇,牛安福,鲁德顺,等.地壳形变与地下水动态异常特征研究进展[J].西北地震学报,2005,27(1):89-95.
[5]李杰,刘敏,邹钟毅,等.数字化钻孔体应变干扰机理及异常分析[J].地震研究,2003,26(3):231-238.
[6]孔礼健,朱元清,尹纪尧.钻孔对初始应力场扰动影响的初步研究[J].西北地震学报,2009,31(2):131-135.
[7]丁风和,赵铁锁,九占军,等.大甸子井水位的气压系数及其震前异常[J].西北地震学报,2007,29(2):174-182.
[8]张绍治,拾礼勤.徐州台体应变动态观测干扰因素的分析与信息提取[A]∥地震预报方法实用化研究文集--形变、重力、应变专集[G].北京:地震出版社,1991:535-541.
[9]张凌空.降雨对体应变的干扰[J].地壳形变与地震,1995,4(3):78-83.
[10]国家地震局预测预防司.地壳形变分析预报方法[M].北京:地震出版社,1998:72-91.
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