数字化地磁数据的空间相关分析
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摘要
以FHD磁力仪观测数据作空间相关分析,采用不同整点值的相关、不同时间段的均值相关、分钟值数据的直接相关和不同台站观测数据存在的相位差等方面的分析处理,发现每日整点值的相关系数最高的时间段为09时至15时之间,其他时间段相关系数都相对较低,但就地震预报而言,最合适的时间段为23时～05时,而不是采用21时的数据;用分钟值作相关处理,可以更加突出异常的连续性和演化性特征,异常时间段能够更加清晰;另外,利用分钟值能对不同台站间的观测结果进行较好的相位校正。结果表明:随着地磁观测数字化的普及,数据信息量的大幅增加,我们应该采用更加灵活与合理的方法处理数据资料。
In this paper,the space correlation analysis of the FHD magnetometer observation data is presented. Multiple processes,including the correlation of different value at whole point,correlation of the average value of different time segments,direct correlation of minute sample data and the phase difference analysis of data from different stations are performed. It is found that the highest correlation coefficient of whole point value correlation is in the period of 09 am to 03 pm,while the coefficients are lower in other time. For earthquake prediction,however,the most appropriate time period is 11 pm to 05 am,rather than the data at 09 pm. The correlation process of minute data can enhance the continuity and the evolution feature of the anomalies. The time periods of anomalies become clear. In addition,phase correcting of different stations can be derived by use of minute data. The results indicate that with the popularization of digital geomagnetic observation and the great increment of data volume,more flexible and more rational methods should be applied in data process.
In this paper,the space correlation analysis of the FHD magnetometer observation data is presented. Multiple processes,including the correlation of different value at whole point,correlation of the average value of different time segments,direct correlation of minute sample data and the phase difference analysis of data from different stations are performed. It is found that the highest correlation coefficient of whole point value correlation is in the period of 09 am to 03 pm,while the coefficients are lower in other time. For earthquake prediction,however,the most appropriate time period is 11 pm to 05 am,rather than the data at 09 pm. The correlation process of minute data can enhance the continuity and the evolution feature of the anomalies. The time periods of anomalies become clear. In addition,phase correcting of different stations can be derived by use of minute data. The results indicate that with the popularization of digital geomagnetic observation and the great increment of data volume,more flexible and more rational methods should be applied in data process.
引文
丁鉴海,卢振业等.1994.地震地磁学[M].北京:地震出版社,32
冯志生,王建宇等.2000.江苏地区地磁Z21测值空间相关异常及其标志体系[J].地震地磁观测及研究,21(1):44～49
冯志生,蒋延林等.2003.观测时间对地磁绝对观测值的空间相关性影响研究[M].地震,23(3):126～130
曾小苹,林云芳等.1998.地磁方法预报灾害[M].联合国地磁方法研讨会专用教材,19～24
冯志生,王建宇等.2000.江苏地区地磁Z21测值空间相关异常及其标志体系[J].地震地磁观测及研究,21(1):44～49
冯志生,蒋延林等.2003.观测时间对地磁绝对观测值的空间相关性影响研究[M].地震,23(3):126～130
曾小苹,林云芳等.1998.地磁方法预报灾害[M].联合国地磁方法研讨会专用教材,19～24
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