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UserDisplay For EEW |
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Development of a UserDisplay to provide Earthquake Early Warning to End-Users
The UserDisplay (UD) has two purposes: (1) to translate alerts (origin time, location, magnitude) from CISN ShakeAlert to site-specific warnings (expected MMI intensity, remaining warning time), and (2) to display these values on a map to alert users (Bӧse et al., 2010; Solanki et al., 2011). The UserDisplay is written in Java and is thus platform-independent. A desktop version is available since 2010. Distribution of version 2.3 to a selected group of test users from the business, utility and transportation sectors in California has started in early 2012. The UserDisplay has the following capabilities (Bӧse et al., 2012):
calculation & display of remaining warning time for a given user calculation & display of expected MMI intensity at this site (the user can specify a Vs30 value for site characterization if desired) description of expected MMI intensity at user site (e.g., Moderate Shaking expected) display of estimated magnitude display of the probability of correct alarm (likelihood parameter) calculation & display of P/S-wavefronts display of user site display of a 30-km radius blind-zone around the user for education purpose siren and audio announcement
The User Display pops up automatically whenever a ShakeAlert message is received. The user can set thresholds for intensities, magnitudes and probability values to reduce the number of reports. Like the CISN Display (www.cisn.org) UD uses Openmap. Multiple map layers showing, e.g., fault lines or infrastructure can be added. Xml messages received by the UD are stored locally in a history folder and can be replayed. A log-file summarizes the key information for each received report. Network Time Protocol (NTP) is used for time synchronization. Further features include password-protection, encrypted communication with ShakeAlert, and the capability to receive and display heartbeats to ensure robust communication. Installation and operation of the UserDisplay have been documented in the Operations Guide (Bӧse et al., 2011).
References: Bӧse, M., Allen, R., Brown, H., Cua, G., Fischer, M., Hauksson, E., Heaton, T., Hellweg, M., Liukis, M., Neuhauser, D., Maechling, P. & CISN EEW Group, 2012: CISN ShakeAlert - An Earthquake Early Warning Demonstration System for California, in: Early Warning for Geological Disasters - Scientific concepts and current practice, Earthquake Early Warning Systems, eds. Wenzel, F. & Zschau, J., Springer, in press. |
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Last up-date: 12/13/2012 |
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Maren Bӧse, Phd Senior ReseaRch Fellow |
