摘要
对固原海子峡体应变2008年1月以来的观测数据进行了连续率、日漂移、内在精度以及噪声水平等方面的统计分析,结果显示观测资料连续率高,内在精度高,漂移快,噪声水平相对偏高。并从中选取了4个时段与气压进行相关分析,结果显示两者存在高度相关性,且体应变随气压变化在时间上存在40 min的滞后效应,应用相关分析方法去除气压对体应变的影响,能通过资料内精度检验,效果显著。结合宁夏南部地区震情趋势,应用差分分析方法简要介绍了4级左右地震前体应变出现的异常变化特征。
The statistical analysis of volume strain data since January in 2008 in Guyuan station was done, including continue rate, daily drift, intrinsic accuracy and noise level etc. The result showed the continue rate, intrinsic accuracy and noise level were all higher, the daily drift was fast. The correlation analysis between the observation data and barometric pressure was done during 4 selected periods and the result showed the observation data was closely related with barometric pressure and there was hysteresis effect for 40 minutes. Removing barometric pressure influence through correlation analysis could pass the intrinsic accuracy test and got significant effects. Combined with earthquake tendency in south of Ningxia, the anomaly characteristics before 4.0 earthquakes was introduced using difference analysis briefly.
出处
《内陆地震》
2011年第1期78-84,共7页
Inland Earthquake
基金
中国地震局2010年度震情跟踪合同制定向工作任务项目(2010020701)资助
关键词
体应变
干扰因素
相关分析
差分分析
异常特征
Volume strain
Interference factors
Relative analysis
Difference analysis
Anomaly characteristics
