Inversion of the Physical Properties of the Seabed Using Chirp Sub-Bottom Data in Mud Volcanoes Field of the Southwest of Dongsha Islands
Chen Sen
Yan Pin
Wang Yanlin
Abstract：Mud volcanoes are imaged from Chirp sub-bottom profiles across the southwest of Dongsha Islands.In order to quan-tify the physical properties of the seabed,this paper studies the inversion of the Chirp sub-bottom data.First,reflection coeffi-cients of the seabed are calculated,the results show that the reflection magnitudes of the seabed vary from 0.1 -0.8.The physical properties (velocity,density,porosity etc.)of the seabed are obtained by the Schock-Stoll Model and the empirical re-lationships among the physical properties for the part reflection coefficients smaller than 0.45,and the physical properties (ve-locity and density)of the seabed are obtained by Gardner empirical equation for the part reflection coefficients larger than 0.45. Results of the inversion show that the physical properties vary greatly with the maximum velocity of 5 237 m/s and density of 2.673 g/cm3 .The Chirp data-based physical properties highly coincide with the laboratory measurements for sampled sedi-ments,thus provides us a remote acoustic method for estimating the physical properties of the seabed.
Keywords：Chirp sub-bottom dataSouthwest of Dongsha Islandsmud volcanosacoustic property of the seabedinversion
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 425-432 )