Abstract
Linear traveltime interpolation ray tracing (LTI) is a ray tracing technology which has a global searching ability and a relatively high computational efficiency. In order to overcome the issues of poor computational efficiency and the unreasonable ray tracing path in the near travel-time field caused by LTI's linear hypothesis, we propose an improved bilinear travel-time interpolation algorithm (improved BLTI). This algorithm uses the dynamic variable density mesh mode to improve the travel-time accuracy effectively, especially in the near travel-time field. The application of the rapid determinant conditions and the simplified formulas effectively reduces the computational complexity and improves the computational efficiency. Application of the theoretical model to real near surface tomographic inversion demonstrates the effectiveness of the method.
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