Estimates of Tsunami Energy from GPS and Dart Data
Abstract
Two independent approaches for tsunami energy assessment are investigated: one is based on inversion of the Deep-ocean Assessment and Reporting of Tsunamis (DART) data, and the other is derived from the land-based coastal global positioning system (GPS). The two approaches are examined with data from the March 11, 2011 Japanese tsunami and several other events. While the GPS approach takes into consideration the dynamic earthquake process, the DART inversion approach provides the actual tsunami energy estimation of the propagating tsunami waves; both approaches lead to consistent energy scales for previously studied tsunamis. Encouraged by these promising results, we examined a real-time approach to determine tsunami energy by combining these two methods: first, determine the tsunami source from the globally expanding GPS network immediately after an earthquake for near- field early warnings; and then to refine the tsunami energy estimate from nearby DART measurements for improving forecast accuracy and early cancelations. The combination of these two real-time networks may offer an appealing opportunity for early determination of the tsunami threat for the purpose of saving more lives, and early cancelation of tsunami warnings to avoid unnecessary false alarms.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.G44A..07S
- Keywords:
-
- 4341 Early warning systems;
- NATURAL HAZARDSDE: 4564 Tsunamis and storm surges;
- OCEANOGRAPHY: PHYSICALDE: 7223 Earthquake interaction;
- forecasting;
- and prediction;
- SEISMOLOGYDE: 8419 Volcano monitoring;
- VOLCANOLOGY