Development of the CISN Earthquake Early Warning Web Site: Establishing a Basis for Comparison of Algorithms

Mike Zeleznik, Philip Maechling, Gilead Wurman, Alexei Kireev, Kalpesh Solanki, Richard Allen, Doug Neuhauser, Egill Hauksson, Peggy Hellweg, Giorgia Cua, Thomas Heaton


AGU Fall Meeting, San Francisco, December 2007.

As a part of the California Integrated Seismic Network (CISN) earthquake early warning (EEW) algorithm development, we have developed the CISN EEW web site to collect the results of multiple EEW algorithms and to display the algorithm results in a comparative manner. The CISN web site provides a time-based query capability which allows users to specify a time window of interest. The CISN EEW web site can then produce a time-based display which shows all available algorithm results for the specified time window. These time-based plots provide a means of comparing algorithm results. The CISN EEW web site developers have designed an XML-based data-exchange format which represents a common data format in which all the CISN EEW algorithm developers can format their results, and a data transfer mechanism for moving the data from the real-time network centers to non-real-time web site hosts. Incoming EEW data sets are automatically discovered by the web site processing system and entered into a data management database at which time the data are available for discovery and display through the web site's query tools. The CISN web site is one part of a larger program of algorithm evaluation currently underway by CISN EEW algorithm development groups. The CISN EEW program of algorithm evaluation includes definition of common EEW algorithm data exchange formats, the establishment of a collection point for EEW algorithm results, and the development of web-based tools for comparing these results. Further techniques for comparing and evaluating the performance of EEW algorithms are under development by the group and will be implemented on the web site when available.

© Richard M Allen