This GPS Network is funded by the NSF Major Research Instrumentation Program (EAR-0722540, August 1, 2007-July 31, 2009) . It is operated and maintained by the Puerto Rico Seismic Network (PRSN) at the University of Puerto Rico-Mayagüez. The PRSN is a regional earthquake and tsunami monitoring institute. One of its primary objective is to provide timely and reliable earthquake and tsunami information and warning to the state (Puerto Rico) and local governments, the US and British Virgin Islands, as well as to the general public.