Ingeniare. Revista chilena de ingeniería versión On-line ISSN
0718-3305 TORRES-SILVA, H y SOUZA DE ASSIS, A. VELOCITY AND
GRAVITATIONAL EFFECTS ON GPS SATELLITES: AN OUTLINE OF EARLY
PREDICTION AND DETECTION OF STRONG EARTHQUAKES. Ingeniare. Rev.
chil. ing. [online]. 2010, vol.18, n.3, pp. 286-294. ISSN
0718-3305. doi: 10.4067/S0718-33052010000300002. Today, the
global navigation satellite systems, GPS used as global
positioning systems, are based on a gravitational model and
hence they are only operative when several relativistic effects
are taken into account. The most important relativistic effects
(to order 1/c2) are: the Doppler red shift of second order, due
to the motion of the satellite (special relativity) and the
Einstein gravitational blue shift effect of the satellite clock
frequency (equivalence principle of general relativity). Both of
these effects can be treated at a basic level, making for an
appealing application of relativity to every life. This paper
examines the significant effects that m