This paper is in Portuguese. Seismic Tomography is a set of techniques used to obtain an image of the velocity field in the earth's interior using data recorded in the surface. In this work is used the tomography technique based on first arrival times inversion of seismological records of P waves generated by earthquakes, to obtain a pseudo 3D velocity filed. The interest area is Bucaramanga Seismic Nest, a high seismic activity area due to the collision of the Nazca and the Caribbean plates under the Suramericana plate (Zarifi et al, 2007) that gives rise to earthquakes at intermediate depths. The tomography developed use data of the P waves generated around 200 kilometers of depth with respect to the surface. Data of 1223 earthquakes occurred in the department of Santander (Colombia) between latitudes 6 and 8 and lengths -74 and -72 in the period of January 2012 to June 2016 were initially selected. After filtering through specific parameters data of 1127 earthquakes were used to generate a first 1D velocity model, using the Velest program. Subsequently, through the use of Simulps14 program was generated the final pseudo 3D velocity model. Seismic stations of the National Seismological Network of Colombia (RSNC) recorded all data used in the present work.