基于数据的前兆仪器分辨力检测方法研究
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摘要
仪器的分辨力是能否记录到包括地震前兆在内的环境变化异常的关键。目前实测的仪器分辨力能否满足有效捕捉地震前兆微观信息还有待验证。文章以观测数据短期变化能否有效区分长时间环境变化为判断依据,设计一种根据观测小时段数据变化来估算仪器相对分辨力的新方法。根据地温短期受环境影响变化微小的特点,选取全国595个地温测点近10年数据分3类仪器和3个测项为例进行计算,用等距抽样的方式抽取大量的小时段数据作为研究样本。用间距一定时间的两个样本均值差描述环境变化,并以此通过两次聚类分别排除各测点组内和组间的环境变化异常样本。计算正常测点中的正常样本标准差来描述仪器的分辨力。实验结果表明,各类地温仪器分辨力与各自实际性能比较吻合,只有少部分测点的相对分辨力无法满足观测要求。
The resolution of the instrument is the key to record environmental changes including earthquake precursors.Whether the present instrument resolution can satisfy the microcosmic information of earthquake precursor is still to be verified.A new method for estimating the relative resolution of the instrument is designed based on the short-term variation of the observed data to distinguish the long-term variation of the environment.The data of 595 groundwater temperature observation points in China in the past 10 years were divided into 3 types of instruments and 3 measured items for calculation.Large amount of groundwater temperature data in small period were sampled by isometric sampling.The difference of the mean values of two samples with a certain interval is used to describe the environmental change,and the abnormal samples of environmental change within and between each group are excluded by two cluster analysis.The resolution of the instrument is described by calculating standard deviation of the normal sample s in the normal measuring points.The experimental results show that the resolution of various types of the underground temperature instruments is in good agreement with their actual performances except that a few instruments whose relative resolution cannot meet the observation requirements.
The resolution of the instrument is the key to record environmental changes including earthquake precursors.Whether the present instrument resolution can satisfy the microcosmic information of earthquake precursor is still to be verified.A new method for estimating the relative resolution of the instrument is designed based on the short-term variation of the observed data to distinguish the long-term variation of the environment.The data of 595 groundwater temperature observation points in China in the past 10 years were divided into 3 types of instruments and 3 measured items for calculation.Large amount of groundwater temperature data in small period were sampled by isometric sampling.The difference of the mean values of two samples with a certain interval is used to describe the environmental change,and the abnormal samples of environmental change within and between each group are excluded by two cluster analysis.The resolution of the instrument is described by calculating standard deviation of the normal sample s in the normal measuring points.The experimental results show that the resolution of various types of the underground temperature instruments is in good agreement with their actual performances except that a few instruments whose relative resolution cannot meet the observation requirements.
引文
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[3]于金涛,赵树延,王祁.基于经验模态分解和小波变换声发射信号去噪[J].哈尔滨工业大学学报,2011,43(10):88-92.
[4]焦卫东,杨世锡,钱苏翔,等.乘性噪声消除的同态变换盲源分离算法[J].浙江大学学报(工学版),2006,40(4):581-614.
[5]赵刚,何案华,马文娟,等.不同动态背景的地热对比观测研究[J].地震学报,2011,33(1):51-61.
[6]邱永平.宁波地震台ZK03井水温平行观测资料的对比分析[J].中国地震,2011,27(4):431-437.
[7]刘春国,李正媛,吕品姬,等.数字化地震前兆台网观测数据质量评价方法[J].中国地震,2017,33(1):112-121.