Katsumata, Akio Japan Meteorological Agency
Hayashi, Yutaka Japan Meteorological Agency
Miyaoka, Kazuki Japan Meteorological Agency
Tsushima, Hiroaki Japan Meteorological Agency
Catalán, Patricio A. Universidad Técnica Federico Santa María|Centro Nacional de Investigación para la Gestión Integrada de Desastres Naturales
Zelaya, Cecilia Chilean Navy
Vasquez, Felipe Riquelme National Office of Emergency of the Interior Ministry
Sanchez-Olavarria, Rodrigo University of Chile
Barrientos, Sergio University of Chile
One of the quickest means of tsunami evacuation is transfer to higher ground soon after strong and long ground shaking. Ground shaking itself is a good initiator of the evacuation from disastrous tsunami. Longer period seismic waves are considered to be more correlated with the earthquake magnitude. We investigated the possible application of this to tsunami hazard alarm using single-site ground motion observation. Information from the mass media is sometimes unavailable due to power failure soon after a large earthquake. Even when an official alarm is available, multiple information sources of tsunami alert would help people become aware of the coming risk of a tsunami. Thus, a device that indicates risk of a tsunami without requiring other data would be helpful to those who should evacuate. Since the sensitivity of a low-cost MEMS (microelectromechanical systems) accelerometer is sufficient for this purpose, tsunami alarm equipment for home use may be easily realized. Amplitude of long-period (20 s cutoff) displacement was proposed as the threshold for the alarm based on empirical relationships among magnitude, tsunami height, hypocentral distance, and peak ground displacement of seismic waves. Application of this method to recent major earthquakes indicated that such equipment could effectively alert people to the possibility of tsunami.
Natural Hazards and Earth System Sciences
Copernicus Publications|European Geosciences Union
This work is distributed under the Creative Commons Attribution 3.0 License(https://creativecommons.org/licenses/by/3.0/).
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