深海海山区地磁日变观测系统设计及应用

Design and Application of Geomagnetic Daily Variation Observation System in Deep Sea Seamount

地磁日变改正数据的合理选取直接关系到海洋磁测的成果精度。深海海山区磁力测量常因缺少测区附近的日变观测数据而使磁测结果得不到准确校正,从而导致磁力数据处理产生较大误差,影响磁法勘探的效果。为提高深海海山区磁力测量日变改正的精度,介绍了一种深海海山区地磁日变观测系统,分别从海洋磁力日变站布设位置的选取、锚系的设计、锚系的布放与回收等方面对已有海底日变站观测系统进行改进,提高了深海海山区海洋磁力日变观测数据的质量,弥补了以往深海海山区地磁日变站的不足,避免以往出现的不能安全回收和故障率高等问题。通过后期实测数据的质量统计与分析,确定本文所采用的方法的准确性与合理性,为深海海山区布设地磁日变站观测系统提供参考。

The reasonable selection of geomagnetic day-to-day correction data is vital to the accuracy of the results of marine magnetic surveys.Due to lack of daily observation data near the survey area,magnetic measurements in deep sea seamount area often cause inaccurately corrected magnetic measurements,thereby resulting in large errors in magnetic data processing and then affecting the effectiveness of magnetic surveys.In order to improve the accuracy of the daily change of magnetic measurements,this study presented a geomagnetic day-variation observation system in the deep sea seamount area,and improvedhe existing submarine daily observation station observation system including polish up the selection of the position of the installation of the marine magnetic force day-change station,the design of the anchor system,and the deployment and recovery of the anchor system.The data quality of the daily observation of marine magnetic force in the deep sea seamount area was improved,and made up the insufficiency of the conventional geomagnetic day-change station in the deep sea seamount area in the past,and avoided some problems such as the failure of safely recovery and highly failure rates.Through the quality statistics and analysis for the measured data,this study confirmed that the method used is accuracy and rationality,which provide a reference for the installation of geomagnetic day-change station observation system in the deep-sea seamounts.