P AND S WAVE VELOCITY MODEL OF SAN ANDREAS FAULT NEAR PARKFIELD, CALIFORNIA

As a part of EarthScope , the San Andreas Fault Observatory at depth (SAFOD), is a proposed 4-Km-deep drilling project across san andreas fault, near parkfield , California. The aim is to understand the composition, physical state and mechanical behavior of the fault, using insitu data. To assist the planning of the drill hole and interpretation of the data gathered from that, a 50 Km seismic line having 3-component geophone is obtained in November 03. The aim is to obtain excellent velocity model and reflection image beneath the drilling site. In the current research the focus is to extend the earlier work (Hole et al, 2001) to obtain the velocity model to a depth of 4-5Km. We will be presenting the p and s wave velocity model based on refraction traveltime tomography.