Major Projects &
Modeling Advances in the SCEC Geodesy Community Workshop
Conveners: Rowena Lohman and Jessica Murray
Dates: September 9, 2012 (08:00-12:00)
Location: Hilton Palm Springs Resort, Palm Springs, CA
Participation: View list of registrants
SCEC Award and Report: 12094
SUMMARY: This workshop addressed three major SCEC4 Tectonic Geodesy modeling activities: the Community Geodetic Model (CGM), Geodetic Transient Detection, and a new Geodetic Source Inversion exercise.
Community Geodetic Model (8:00-9:30am)
Following an introduction by Jessica Murray, Kaj Johnson discussed the contribution that the CGM could make to deformation modeling used in seismic hazard assessments like UCERF3. Increased spatial density of observations in some locations could help better constrain block models and quantify distributed strain within blocks..
Murray and Scott Baker, respectively, provided overviews of existing GPS and SAR data coverage and the prospects for data availability (particularly SAR data) going forward. Three additional presentations (by Alejandro Gonzales, Brendan Crowell, and Yuri Fialko) highlighted recent SCEC-supported campaign GPS efforts in southern California and Baja, Mexico that were designed to target specific topics such as characterizing the postseismic deformation from the El Mayor Cucapah earthquake and quantifying fault creep.
Finally, Roland Bürgmann spoke about ways to integrate GPS and InSAR data into a unified data product. A variety of approaches exist, and all are to some degree model-dependent. One challenge for the development of the CGM will be to identify the most promising approaches for southern California and provide appropriate uncertainty information for the resulting product accounting for the error sources inherent in both data types.
The primary goal of this portion of the workshop was to introduce the CGM to the SCEC community and initiate discussion. A follow-on workshop involving scientists who are likely to be directly involved in developing and applying the CGM is envisioned for 2013. A goal for that workshop will be establishing timelines and a work plan for generating the CGM.
Geodetic Transient Detection (10:00-11:00am)
Geodetic Source Inversion Validation (11:10am-12:00pm)
Initially, participants will be given some knowledge about the source geometry and noise characteristics, to ensure that data input/output formats are understood and that the same conventions for Green’s functions are being used. Data will be generated using progressively more complicated source geometries, slip distributions and data noise characteristics, and results can be submitted through an online interface.
Midway through the session, Brendan Meade presented an example of a new direction in source inversion validation that can be tested using this approach. By seeking the most spatially compact solution that is consistent with the data, he is able to explore a different end member model from the spatially smooth ones that are typically found in inversions that rely on regularization through roughness or minimum length constraints.AGENDA
Presentation slides may be downloaded by clicking the pdf links following the title. PLEASE NOTE: Slides are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.
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