We present a prestack time-migration tool for local improvement of the seismic migration-velocity model. The method is based on time-remigration trajectories. It determines kinematic parameters using local-slope information of seismic reflection events. These parameters, in turn, are used to locally correct the velocity model. The main advantage of this technique is that it allows to carry out a moveout correction not just at a fixed point in a zero-offset (post-stack) time-migrated gather, but varying through all offsets of a common image gather (CIG), and taking into account the reflection-point displacement in the midpoint direction. In other words, it provides for migration velocity analysis (MVA) by time-remigration trajectories in prestack data. Tests on synthetic and SMAART-Sigsbee2B data show that the proposed tool not only increased the velocity-model resolution, but also provides a plausible time-migrated image. 797801Al-Yahya, K.M., Velocity analysis by iterative profile migration (1989) Geophysics, 54 (6), pp. 718-729Coimbra, T.A., De Figueiredo, J.J.S., Novais, A., Schleicher, J., Arashiro, S., Migration velocity analysis using residual diffraction moveout in the pre-stack depth domain (2013) Annual WIT Report, 17, This ReportCoimbra, T.A., De Figueiredo, J.J.S., Schleicher, J., Novais, A., Costa, J., Migration velocity analysis using residual diffraction moveout in the poststack depth domain (2013) Geophysics, 78 (3), pp. S125-S135. , doi: 10. 1190/geo2012-0340. 1Coimbra, T.A., Santos, H.B., Schleicher, J., Novais, A., Migration Velocity Analysis using Time-Remigration Trajectory in Prestack Data (2013) 13th International Congress of the Brazilian Geophysical Society & EXPOGEF, 3, Rio de Janeiro, Brazil, 1-5Fomel, S., Velocity continuation and the anatomy of residual prestack time migration (2003) Geophysics, 67 (5), pp. 1650-1661Fomel, S., Method of velocity continuation in the problem of seismic time migration (1994) Russian Geology and Geophysics, 35 (5), pp. 100-111Fomel, S., Landa, E., Taner, M.T., Poststack velocity analysis by separation and imaging of seismic diffractions (2007) Geophysics, 72 (6), pp. U89-U94. , ISSN 6 doi:10. 1190/1. 2781533Liptow, F., Hubral, P., Migrating around in circles (1995) The Leading Edge, 14 (11), pp. 1125-1127Liu, Z., Bleistein, N., Migration velocity analysis: Theory and an iterative algorithm (1995) Geophysics, 60 (1), pp. 142-153Novais, A., Costa, J., Schleicher, J., GPR velocity determination by image-wave remigration (2008) Journal of Applied Geophysics, 65 (2), pp. 65-72Schleicher, J., Hubral, P., Höcht, G., Seismic constant-velocity remigration (1997) Geophysics, 62 (2), pp. 589-597