Observations of deformation by use of GPS techniques is the general target of WP 3. It includes to organize within the HOTSPOT structures a deformation database center containing ongoing continuous GPS measurements as well as results of other GPS studies. It initiates and prepares for introducing continuous GPS in the highlands of Iceland. The lead contractor has experience in GPS measurements in Iceland for several years and is building a continuous GPS in the Alps. Thóra Árnadóttir is responsible for the ongoing build-up of continuous GPS measurements in the seismic zones of Iceland. Freysteinn Sigmundsson and Páll Einarsson have a long experience in deformation measurements in Iceland, GPS, SAR and geodimeter measurements.