The mission of the National Earthquake Information Center (NEIC) is to determine rapidly the location and size of all destructive earthquakes worldwide and to immediately disseminate this information to concerned national and international agencies, scientists, and the general public. NEIC compiles and maintains an extensive, global seismic database on earthquake parameters and their effects that serves as a solid foundation for basic and applied earth science research. The project work is in the Central Region Geologic Hazards Team, Geologic Division, which is headquartered The Geologic Hazards Team (GHT) conducts
research in geology, geophysics, seismology, engineering seismology, geomagnetism.and geomechanics in order to assess seismic hazards, geomagnetic hazards, and risk and groundfailure hazards on regional, national, and international scales. The contractor shall conduct basic and applied research on NEIC-related earthquake response systems, modeling large (M7 or greater), potentially destructive earthquakes, using both moment tensor and finite fault aproaches. Develop new methods to improve NEIC's ability to characterize their source properties (location, magnitude, mechanism and kinematics of rupture). Lead development of a Global Subduction Zone Interface Geometry model in order to i) understand better the seismotectonics of active subduction source zones, ii) improve rapid, finite-fault source inversions by constraining faulting geometry a priori, and iii) improve PSHA calculations by better determined source geometries. All these efforts will also contribute to the USGS PAGER system's performance and capabilities. The contractor shall define subduction source seismic interfaces with novel techniques combining i) existing relocated earthquake catalogs, ii) Global CMT geometries and moments, ii) active seismic profiles available in the literature, iv) trench bathymetry and other data sources. Integrate results into a global 3-D subduction slab geometry model to better understand and characterize these seismic source zones. Deliverable: Bi-monthly reporting on subduction zone progress as each region is covered. Meeting Abstracts, journal article preprints contribute to report. The contractor shall make best use of existing datasets and sources of information on global earthquakes and tectonics to improve its ability to response effectively to earthquakes. Contribute such data in for earthquake response, providing Tectonic Summaries for any significant earthquakes around the globe. Deliverable: Monthly summary of response contributions. The contractor shall manage and continue development of the real-time W-Phase Moment tensor system for NEIC real-time response. Product Q/A statistics to understand quality and limitations of the approach. Deliverable: Monthly summary ofW-phase event statistics and bi-monthly development progress reporting.The contractor shall assume responsibility for the development of finite fault (FF) modeling ofM7+ earthquakes as part ofNEIC response activities. This involves working with USGS staff on existing FF modeling procedures, developing new procedures for automatic QA of waveforms, and modifying scripts and algorithms to improve the robustness of the solutions. Deliverable: Bi-monthly summary of finite-fault event statistics and development progress reporting.