Near-field 1-Hz GPS Recordings from the Parkfield Earthquake

Thirteen near-field 1-Hz GPS recordings are available for the Parkfield earthquake. Although this event is smaller magnitude than other recent 1-Hz GPS seismology studies (Denali, San Simeon, Tokachi-Oki), the sites are located much closer to the rupture. To provide useful constraints for seismologists, it is important that GPS error sources are minimized. We have developed a new methodology to improve 1-Hz GPS position estimates that we will describe here. Comparisons with colocated strong motion instruments as well as using the 1-Hz GPS recordings as integration constraints for strong motion recordings will also be discussed.