Application of Refraction Seismic Tomography Method Using Wavepath Eikonal Traveltime Inversion for Modelling the Subsurface

2nd Southeast Asian Conference on Geophysics

Nurul Nida, Hashina^1 ; Asta Yogantara, Made^1 ; Otolomo, Munawir A. P.^1 ; Sanny, Teuku A.^2

Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha 10, Bandung

40123, Indonesia^1

Exploration Seismology and Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha 10, Bandung

40123, Indonesia^2

关键词: Eikonal equation;    Finite-difference solution;    Forward modelling;    Geophysical methods;    Refraction seismics;    Shallow subsurface;    Subsurface model;    Weathering zones;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/318/1/012016/pdf
DOI  :  10.1088/1755-1315/318/1/012016

来源: IOP

【 摘 要 】

Refraction seismic tomography is a geophysical method that is able to image shallow subsurface velocity variation. Common application of this method is for Civil Engineering include near-surface problem such as weathering zone and bedrock. In this study, refraction seismic tomography was using Wavepath Eikonal Traveltime (WET) inversion. This method is performed by software RayfractTM. The initial model is generated by Delta-t-V method and smoothing inversion. The Delta-t-V method obtain a 2D initial model, while the smoothing inversion obtain a 1D initial model. The forward modelling is done by finite-difference solution using Eikonal equation to obtain the ray tracing. Then WET inversion will obtain the subsurface model. The imaging result is able to show the thickness of weathering layer and the depth of the bedrock. The tomographic interpretation indicates the thickness of weathering layer is 2-10 meter, while the bedrock presence at depth 7-35 meter from the surface.