Feasibility of Applying Traveltime Tomography Analysis in Underwater Single-side Seismic Survey
Journal
6th Asia Pacific Meeting on Near Surface Geoscience and Engineering
Start Page
1
End Page
4
Date Issued
2024
Author(s)
Abstract
Seabed characterization is one of the most important tasks in offshore engineering. Underwater geophysical methods can finish the survey efficiently even for large areas. The underwater single-side seismic method is one of the available methods and can provide the Vs and Vp of the seabed for the following engineering designs. The underwater single-side seismic method is the combined survey method for the underwater surface wave method(UMASW) and underwater seismic refraction method(USRM). Restricted by the theory(UMASW) and the low data density(USRM), currently, they can be analyzed with 1D theories. The study aims to apply 2D tomography to analyze the data and determine the required field configurations and inversion parameters. Based on the inversion results from theoretical travel time curves, the underwater single-side seismic method can be analyzed with tomography inversion if the distance between each shot is smaller than 1/3 of the survey line length. Further, the total cells in inversions should be within 10000~13000 and the width of the cell should be 0.175~0.25 receiver spacing. The suvey is suitable for high-resolution and shallow-depth (<5m) investigations. More field data would be collected for verifications.
Subjects
Geological surveys
Offshore technology
Refraction
Seismic design
Seismic response
Seismic waves
Submarine geophysics
Data density
Engineering design
Geophysical methods
Offshore engineering
Seismic methods
Seismic refraction
Seismic surveys
Survey methods
Travel time tomography
Wave method
Seismic prospecting
SDGs
Publisher
European Association of Geoscientists & Engineers
Type
conference proceedings