Bathymetry Prediction Based on the Admittance Theory of Gravity Anomalies

doi:10.11947/j.AGCS.2015.20140427

Abstract

Abstract: Based on the admittance theory of gravity anomalies, the method of bathymetry prediction was studied in detail in this paper. In frequency domains, the correlation between gravity anomalies and bathymetry was analyzed, which suggests that the wavelength band correlated strongly was in a range of 20—300 km, this band was appropriated to inverse bathymetry by gravity anomalies. Took the Emperor Chain as an example, the uncompensated admittance model and flexural isostatic admittance model were used for researching, respectively, the included parameter of crust thickness and effective elastic thickness were calculated by the isostatic response function. As the down continuation factor was unstable, a high-cut filter was proposed in the inversion procedure to ensure convergence of series. The results showed that, the admittance theory of gravity anomalies can be used effectively in the bathymetry prediction, the predicted result was real and reliable, the relative precision was approximately 6%, which was equal to ETOPO1 model, and the detailed feature of sea floor which was not showed in ETOPO1 model can also be depicted; the precisions were not so well in areas of ocean mountains intensively distributed because of the complexion of the sea floor.

Key words: gravity topography admittance, bathymetry, gravity anomalies, isostatic theory

CLC Number:

P228

OUYANG Mingda, SUN Zhongmiao, ZHAI Zhenhe, LIU Xiaogang. Bathymetry Prediction Based on the Admittance Theory of Gravity Anomalies[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(10): 1092-1099.

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