Effect of a Starting Model on the Solution of a Travel Time Seismic Tomography Problem
| Autor: | V. S. Gobarenko, T. B. Yanovskaya, S. V. Medvedev |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Plane (geometry) The Intersect Mathematical analysis Function (mathematics) 010502 geochemistry & geophysics 01 natural sciences Travel time Nonlinear system Distribution (mathematics) Seismic tomography General Earth and Planetary Sciences Tomography Geology 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Izvestiya, Physics of the Solid Earth. 54:193-200 |
| ISSN: | 1555-6506 1069-3513 |
| DOI: | 10.1134/s1069351318020167 |
| Popis: | In the problems of three-dimensional (3D) travel time seismic tomography where the data are travel times of diving waves and the starting model is a system of plane layers where the velocity is a function of depth alone, the solution turns out to strongly depend on the selection of the starting model. This is due to the fact that in the different starting models, the rays between the same points can intersect different layers, which makes the tomography problem fundamentally nonlinear. This effect is demonstrated by the model example. Based on the same example, it is shown how the starting model should be selected to ensure a solution close to the true velocity distribution. The starting model (the average dependence of the seismic velocity on depth) should be determined by the method of successive iterations at each step of which the horizontal velocity variations in the layers are determined by solving the two-dimensional tomography problem. An example illustrating the application of this technique to the P-wave travel time data in the region of the Black Sea basin is presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink