Extending the CISN Earthquake Early Warning (EEW) Web Site into the CISN EEW Testing Center

As a part of the California Integrated Seismic Network (CISN) earthquake early warning (EEW) algorithm development, funded through USGS NEHRP, we have developed the CISN EEW web site to collect the results of multiple EEW algorithms and to display these results in a comparative manner (www.scec.org/eew). During the last year, the CISN EEW algorithm development group defined a set of EEW algorithm evaluation tests (termed performance summaries). These compare EEW algorithm reports (generated by the real-time or near real-time EEW algorithms) against seismicity data in the ANSS catalog and observed ground motion information available through the SCEC Data Center (SCECDC) and the Northern California Earthquake Data Center (NCEDC). To automatically generate the performance summaries, a software development group at SCEC has integrated elements of the SCEC Collaboratory for the Study of Earthquake Predictability (CSEP) Testing Center into the CISN EEW web site. This has helped establish a CISN EEW Testing Center with capabilities similar to the CSEP Testing Center. After the integration of the CSEP software, the CISN EEW testing center now automatically creates EEW performance summaries and posts them on the CISN EEW web site each day. By leveraging the capabilities of the CSEP Testing Center, the CISN EEW Testing Center has been able to implement several of the testing concepts originally developed on CSEP. These concepts include the following: (a) earthquake, or ground motion, forecasts are reported in standardized data formats, (b) commonly-agreed upon performance evaluation reports are used for all algorithms, (c) observed data is retrieved from 'authorized' data sources and the same observed data is used to evaluate all algorithms, (d) only forecasts and observed data for a specific testing region are considered, and (e) the testing center saves information indicating how results were produced. We present an overview of the CISN EEW Testing Center including the scientific design goals for the system, and a description of the system's current capabilities. We describe the performance summaries specified by the CISN EEW algorithm development group, and how the current CISN EEW Testing Center produces those summaries using the automated testing capabilities from the CSEP software framework.