Depth (SAFOD) The San Andreas Fault Observatory at Depth (SAFOD) consists of a main borehole that cuts across the active San Andreas Fault at a depth of approximately 3 km and a pilot hole about 2 km southwest of San Andreas Fault. Data from the instruments installed in the holes, which consist of geophone sensors, data acquisition systems, and GPS clocks, as well as samples collected during drilling, will help to better understand the processes that control the behavior of the San Andreas Fault. Data Products Data collected from the various observatories are used to create different types of data products. Each data product addresses a different scientific problem. P-Wave Tomography Tomography is a method of producing a three-dimensional image of the internal structures of a solid object (such as the human body or the earth) by the observation and recording of differences in the effects on the passage of energy waves impinging on those structures. The waves of energy are P-waves generated by earthquakes and are recording the wave velocities. The high quality data that is being collected by the permanent seismic stations of USArray and the Advanced National Seismic System (ANSS) will allow the creation of high resolution seismic imaging of the Earth's interior below the United States. Seismic tomography helps constrain mantle velocity structure and aids in the understanding of chemical and geodynamic processes that are at work. With the use of the data collected by USArray and global travel-time data, a global tomography model of P-wave velocity heterogeneity in the mantle can be created. The range and resolution of this technique will allow investigation into the suite of problems that are of concern in the North American mantle lithosphere, including the nature of the major tectonic features. This method gives evidence for differences in thickness and the velocity anomaly of the mantle lithosphere between the stable center of the continent and the more active western North America. This data is vital for the understanding of local lithosphere evolution, and when combined with additional global data, will allow the mantle to be imaged beyond the current extent of USArray. Receiver Reference Models EarthScope Automated Receiver Survey (EARS), has created a prototype of a system that will be used to address several key elements of the production of EarthScope products. One of the prototype systems is the receiver reference model. It will provide crustal thickness and average crustal