This paper analyses and discusses the seismicity and faulting of Central Costa Rica in search for evidence of the strike-slip fault proposed by Astorga et al (1989, 1991), the subparallel strikeslip fault system reported by Fan et al. (1993) and the plate boundary trace in the Central Valley of Costa Rica suggested by Jacob et al. (1991), Fisher et al. (1994) and Marshall et al. (2000).