Lake Chabot GPS deformation network. From tectonic deformation monitoring to calibration network.

The Lake Chabot is located less than 5 km east of the Hayward Fault and might constitute a network able to constrain the slip distribution along the southern Segment of the Hayward Fault during the next seismic event. Additionally, this network will be able to document the displacement in near-field during the next large magnitude rupture. This network is composed of ten monuments located around the lake. This network allows us to survey the deformation of the ground around the lake using multiple techniques (GPS, Total station, LASER, etc.). This innovative concept will allow the GPS user, in collaboration with EBMUD, EBRPD and UCB to test and calibrate their instruments periodically, enabling new field techniques (RTK using PBO sites) as well as updating its processing capabilities with other users using a realistic network (multipath, masks, etc.). We present here displacement field inferred from synthetic models and rupture models expected in order to test the sensitivity of this small scale GPS network. As various activities are completed on a daily basis by participating institution in this area, this displacement field is over layered by various information already available and relevant to the deformation of the area.