针对地磁观测台网中部分记录仪的时钟不准确及产出数据的对应时间与实际时间不一致的问题，提出了地磁数据时钟精度检验的扰动区间极值比对法，利用2015年3月国家地磁观测台网的全部数据对该方法的正确性和可靠性进行检验，并给出校正值。结果表明，该方法对于钟差超过1min的数据检出率达到100%，且对检出的异常数据给出误差小于2min的校正时间，准确率达到94.44%，不受地方时的影响。该方法为国家地磁观测台网对大量仪器时钟精度的监控、数据时钟检验和仪器校时提醒自动化以及磁扰日数据时间校正提供了有效的技术途径。

Aiming at the problem of the clock inaccuracy and the inconsistency between the data time and the actual time in relative recorders of the geomagnetic network,the paper proposes a check of the accuracy of geomagnetic data clock with the checking value by the extremum matching method during the period of geomagnetic disturbance. We checked the accuracy and reliability of the method in using geomagnetic data provided by the National Geomagnetic Network in March, 2015 of China. Experimental results show that when clock difference exceeds 1 minute error data,the detection rate runs up to 100%,and the method can give an error correction time in less than 2 minutes with the accuracy rate of 94.44%. The method provides a technical support for the monitoring of the accuracy of a large number of instruments and the data clock correction during the disturbed day.

P315

本研究由地震科技星火计划（XH17017YSX）资助