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Earth Surface & Interior

To advance NASA's objectives for understanding how the Earth's surface is being transformed by naturally occurring tectonic processes, and NASA/ESI's goal to observe aseismic tectonic transient phenomenon, we propose to develop a new capability to measure strain using GPS data at sub-daily periods with high accuracy. This two-year project will incorporate an array of new tools to account for the largest diurnal and sidereal sources of GPS positioning error to obtain stable baseline estimates, from which the strain tensor will be derived. We will take advantage of the recently installed 1000+ GPS stations in the Plate Boundary Observatory network in the US, and also the 1400+ station GPS network in Japan (GEONET). In the first phase, techniques for correcting for multipath and higher-order ionosphere variations will be refined and tested, and the resolution of baseline strain, estimated at varying time scales and length scales, will be determined. In the second phase, these techniques will be used to analyze for the first time episodes of known strain transient (Cascadia and Japan) at sub-daily periods. Then the methodology will be applied to obtain decade-long sub-daily strain estimates in candidate regions, such as the southern section of the San Andreas Fault.

Project PI: Sharon Kedar/Jet Propulsion Laboratory

Jet Propulsion Laboratory M/S 238-600 Jet Propulsion Laboratory 4800 Oak Grove Dr. Pasadena, CA 91109

Phone: (818) 393-6808

Fax: (818) 393-4965

Email: Sharon.Kedar@jpl.nasa.gov

http://technology.jpl.nasa.gov/people/s_kedar/

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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