潘星辰^1,,
姚长利^1,,,
郑元满¹,
石磊²,
张素琴²
1. 中国地质大学(北京)地球物理与信息技术学院, 北京 100083
2. 中国地震局地球物理研究所, 北京 100081

基金项目: 国家自然科学基金项目(41574132)资助


详细信息

作者简介: 潘星辰, 女, 1995年生, 硕士研究生, 地球物理学专业, 主要从事地磁场数值分析研究.E-mail:xingchen_pan@126.com

通讯作者: 姚长利, 从事重磁勘探理论与方法技术研究.E-mail:clyao@cugb.edu.cn

中图分类号: P738;P318

收稿日期:2019-04-18
修回日期:2020-05-19
上线日期:2020-08-05

Study on latitude correction method of diurnal variation correction for marine magnetic survey

PAN XingChen^1,,
YAO ChangLi^1,,,
ZHENG YuanMan¹,
SHI Lei²,
ZHANG SuQin²
1. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China
2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China


More Information

Corresponding author: YAO ChangLi,E-mail:clyao@cugb.edu.cn

MSC: P738;P318

--> Received Date: 18 April 2019
Revised Date: 19 May 2020
Available Online: 05 August 2020


摘要
摘要:目前，在远海开阔性海域磁测中，尚难以有效设立日变站，致使日变改正仍存在着困难.本文利用地磁台站实测资料对地磁日变的纬度分布特征进行研究，发现日变值随纬度变化具有由Sq电流中心向南北两侧递增的规律，且二者之间的关系可用二次函数近似描述。以此规律为基础我们建立了纬度改正方法，该方法以经度链为基站，利用基站数据得到日变值与磁纬度的拟合函数以进行纬度改正，再调整时差作为经度校正即得到计算站的日变值.实测数据计算结果表明，相较于加权平均法，此方法在远距离(经度差达40°)仍能保持较高的校正精度(< 4 nT)，因而能更好地适用于远海磁测.
关键词: 日变校正/
海洋磁测/
纬度改正

Abstract:Nowadays,as it is difficult to effectively establish a station for measuring diurnal variation of geomagnetic field,the diurnal variation correction in the remote marine magnetic survey is greatly limited. Based on extensive researches on the latitude distribution of geomagnetic diurnal variation using data collected from geomagnetic observatories,we find that the diurnal variation value is associated with the geomagnetic latitude,and the relationship there between can be approximately fitted by a quadratic function. Specifically,the value of diurnal variation increases from the Sq current center to the north and south sides. Based on the pattern,a latitude correction method is thus established. In this method,observatories similar in longitude and varying in latitude are selected as base stations,from which the data are used to obtain relationship between the diurnal variation value and geomagnetic latitude for latitude correction. Then time difference is adjusted for longitude correction,thus obtaining diurnal variation values from various stations. Compared to the existing weighted average method,this method can still maintain a high correction accuracy (< 4 nT) for remote stations (with a longitude difference of 40°),so it is more suitable for the magnetic survey in remote sea.
Key words:Diurnal variation correction/
Marine magnetic survey/
Latitude correction



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