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本文介绍了印度洋中1°、5°、20°经纬度方格的平均空间异常值。以20°方格平均值为基础的空间异常图与卫星探到的地势球面调和系数重力有明显的相似性。但是以5°平均值为基础绘制的重力图比由卫星得到的图更为详细。以5°平均值为基础的空间重力图表明重力最小值在印度洋以南以及非洲东部和澳大利亚以西为中心。印度尼西亚(The East Indies Island Arc)岛弧区上呈现为正异常。包括Carlsberg海脊在内的中印度洋海脊有与其两侧海盆异常值有关的正重力异常值。通过航线断面重力值与不同航次调查的1°方格平均值的比较、对资料的精度进行了评价。
This article presents the average spatial anomalies at 1 °, 5 °, 20 ° latitude and longitude in the Indian Ocean. The spatial anomaly plot based on the 20 ° grid averages has obvious similarities with the gravity of the terrain spherical harmonic coefficient explored by the satellite. However, a gravitational plot based on a 5 ° average is more detailed than a satellite-derived plot. Spatial gravity maps based on 5 ° averages show that the gravity minimum is centered south of the Indian Ocean and east of Africa and west of Australia. The arc on the island of The East Indies Island Arc shows a positive anomaly. The mid-Indian Ocean ridges, including the Carlsberg Ridge, have positive gravity anomalies related to outcrops on both sides of the basin. The accuracy of the data was evaluated by comparing the cross-section gravity of the route with the average of 1 ° grids in different voyages surveys.