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(一)海洋地磁测量与处理 地球磁场总强度的测量使用G-801/3型质子旋进磁力仪。测量工作与多道地震、重力测量等同步进行。探头电缆长500m,以降低船磁的影响。由于船磁影响与探头至船距离的三次方成反比,目前的措施可将此影响降至1nT以下,故可忽略不计。 为消除区域场的影响,理应使用国际地磁参考场IGRF1985来进行改正,但为节约时间起见,本次采用多项式来逼近IGRF,两者的差在整个测区内不足1nT,其结果是可信赖
(A) Marine geomagnetic measurement and processing The total strength of the Earth’s magnetic field measurement using the G-801/3 proton precession magnetometer. Measurement work and multi-channel seismic, gravity measurement simultaneously. Probe cable length 500m, to reduce the impact of ship magnet. Since the influence of the ferromagnetism is inversely proportional to the cube of the distance from the probe to the ship, the current measures can reduce this effect below 1 nT, so it is negligible. In order to eliminate the impact of the regional field, it is reasonable to use the International Geomagnetic Reference Field IGRF1985 for correction, but in order to save time, this time using polynomials to approximate IGRF, the difference between the two is less than 1nT in the whole survey area, the result is reliable