SCIGN will provide a key component in improving our understanding of the scientific and earthquake hazard issues. Because of the advantages, dense permanent GPS stations are being used in many earthquake research studies. The time is right for a project like SCIGN in the greater Los Angeles metropolitan region, scientifically, technically, economically, and socially. SCIGN will contribute key data to the current geologic debate between “thick-skinned” and “thin-skinned” models. With a global network of tracking stations and modern data processing, GPS techniques have matured adequately to handle the data volume and provide the precision required. Considering potential losses from earthquakes in the area, SCIGN is inexpensive relative to the scientific payoff. And the earthquake hazard in the region demands that we do everything we can to reduce the risks.