2016 October 18-21 86th SEG Annual Meeting Posted on 24 October 2016 by ctrocme GEOTREF was represented in Dallas, Tx, USA with 1 poster and 1 oral communication. A Competitive Particle Swarm Optimization for non-linear first arrival traveltime tomography. Luu K. 1, Noble M. 1, Gesret A. 1 1. Armines, Paris, France