An Evaluation between Time-term, Reciprocal Time and Refraction Tomography Analysis Methods for obtaining 2-D shallow Seismic Velocity Models over Synthetic Traveltimes

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Authors

Ahmed Jaddoa Al-Heety 

Abstract

Shallow seismic refraction is the principal geophysical method for environmental and engineering site investigations to image the shallow subsurface. We present an assessment of three inversion methods, namely Time-Term inversion, Reciprocal Time methods and Refraction tomography inversion by using commercial software (SeisImagerâ„¢) by using a synthetic first-arrival-time dataset that was made by SeisImager. In this study, we have generated six velocity representative models and the Synthetic travel times were acquired from these models, also we were adding specific random noise to travel times, like to an estimated picking accuracy. Individual interpretation results have been presented in this paper followed by their comparative. These models are designed to represent different subsurface geological features. Refraction Tomography inversion performs well in many situations where conventional methods fail; also tomographic inversion has proved to be a useful technique in identifying subsurface voids Synthetic modeling. The inverted model is compared to the original synthetic model in order to evaluate the resolution and detection capability. From the interpreted results, it can be concluded that the velocity model from tomography inversion is a more accurate representation of the subsurface although results from time-term inversion can be used along with tomographic results during interpretation.

DOI

https://doi.org/10.31223/osf.io/gbqe6

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

Inversion, delay time, interpretation, Reciprocal time, Seismic Refraction Tomography, Synthetic model., Time-Term

Dates

Published: 2018-10-22 16:04

Last Updated: 2019-07-10 17:26

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License

Academic Free License (AFL) 3.0

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