The West Coast Earthquake Early Warning Global Navigation Satellite System Working Group

Wednesday, 17 December 2014: 10:50 AM
Kenneth W Hudnut1, Sarah E Minson2, Maren Boese2, Claude Felizardo2, Ingrid A Johanson3, Ronni Grapenthin3, Brendan W Crowell4, David A Schmidt4, Jessica R Murray5, Michael Lisowski6, John O Langbein5, Deborah Smith5, Daniel Determan1, Valerie Irene Thomas1 and Timothy Ian Melbourne7, (1)USGS Pasadena Field Office, Pasadena, CA, United States, (2)California Institute of Technology, Pasadena, CA, United States, (3)Univ California Berkeley, Seismological Laboratory, Berkeley, CA, United States, (4)University of Washington, Seattle, WA, United States, (5)US Geological Survey, Menlo Park, CA, United States, (6)USGS, Vancouver, WA, United States, (7)Central Washington Univ, Ellensburg, WA, United States
Global Navigation Satellite System (GNSS) data permit rapid and accurate measurement of large static displacements and, as such, could be used to improve the performance of earthquake early warning (EEW) systems in the event of large to great earthquakes by providing an effective complement to seismic data. We are working to formally incorporate real-time GNSS data into existing seismic-based EEW systems. The West Coast EEW GNSS Working Group (WC-EEW GNSS WG) was formed to “develop, test and integrate GNSS data into the ShakeAlert system” (USGS OFR 2014-1097). ShakeAlert is the EEW system recognized by the USGS, the federal agency responsible for issuing earthquake alerts. The WC-EEW GNSS WG establishes geodetic standards and coordinates the activities of WC-EEW collaborators that are focused on research and development aspects of real-time GNSS processing and analysis. The long-term objective is to improve accuracy and robustness and to reduce data latency and overall system resource demands. These efforts will ensure the rapid availability of precise input data for the EEW algorithms, the research and development of which is coordinated by WC-EEW Science Coordination Working Group. The WC-EEW GNSS WG activities will carry out comparisons to assess performance of existing and new methods for real-time processing of GNSS data. Subcommittees within the working group are being formed to address requirements of the ShakeAlert production system as follows: 1) define interface specification documents and data format standards, 2) coordinate and specify plans for physical testing of equipment (for example on shake tables), and 3) assess performance of real-time GNSS processing options and define acceptable data specifications. Finally, the working group interfaces with other organizations, such as the IGS Real-Time Working Group, UNAVCO, Inc., and READI, on the incorporation of GNSS into the WC-EEW ShakeAlert production system.