Gravimetric determination of the density of the Zenisu Ridge
Gravimetric determination of the density of the Zenisu Ridge
复制标题
泽尼苏海脊密度的重量测定
DOI：
10.1016/0040-1951(89)90391-0
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
T. Ishihara
中科院分区：
文献类型：
--
作者：
T. Ishihara
本文的主题是Zenisu脊的重力、海底测深和单道地震资料分析。采用快速傅立叶变换方法，计算了恩顺达木海山基底面和海底地形对重力的影响。海底山基底的密度由观测到的自由空气异常和计算得到的重力效应之间的线性最小二乘拟合决定。结果表明，基底密度最可能为2.87 g/cm3，沉积物密度在2.05 ~ 2.3 g/cm3之间。这一结果证实了海脊由隆起的海洋地壳组成的假设。2.87 g/cm3的密度高于波宁弧普通海山的密度，作为海洋地壳的平均密度是合理的。
The subject of this paper concerns the analysis of gravity, Seabeam bathymetry and single channel seismic data over the Zenisu Ridge. Gravity effects due to the topographies of the sea bottom and the basement surface of Enshunadaoki Seamount are calculated by means of Fast Fourier Transform. The density of the basement of the seamount is determined by a linear least-squares fit between observed free-air anomalies and calculated gravity effects. The results show that the most probable density of the basement is 2.87 g/cm3and that the sediment has a density in the range of 2.05 to 2.3 g/cm3.This result confirms the hypothesis that the ridge consists of uplifted oceanic crust. The value of 2.87 g/cm3is higher than densities of ordinary seamounts in the Bonin Arc and is reasonable as an average density of an oceanic crust.