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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 5 | Copyright
Nat. Hazards Earth Syst. Sci., 17, 685-692, 2017
https://doi.org/10.5194/nhess-17-685-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 May 2017

Research article | 15 May 2017

Stand-alone tsunami alarm equipment

Akio Katsumata1, Yutaka Hayashi1, Kazuki Miyaoka1, Hiroaki Tsushima1, Toshitaka Baba2, Patricio A. Catalán3,4,5, Cecilia Zelaya6, Felipe Riquelme Vasquez7, Rodrigo Sanchez-Olavarria8, and Sergio Barrientos8 Akio Katsumata et al.
  • 1Meteorological Research Institute, Japan Meteorological Agency, Nagamine 1-1, Tsukuba, Ibaraki Prefecture, Japan
  • 2Tokushima University, Shinkura-cho 2-24, Tokushima, Tokushima Prefecture, Japan
  • 3Departamento de Obras Civiles, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Región de Valparaíso, Chile
  • 4Centro Nacional de Investigación para la Gestión Integrada de Desastres Naturales, CONICYT/FONDAP/1511007, Avenida Vicuña Mackenna 4860, Santiago, Región Metropolitana, Chile
  • 5Centro Científico Tecnológico de Valparaíso-CCTVal, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Región de Valparaíso, Chile
  • 6Hydrographic and Oceanographic Service, Chilean Navy, Errázuriz Echaurren 254, Playa Ancha, Región Valparaíso, Chile
  • 7National Office of Emergency of the Interior Ministry, Calle Beaucheff 1671, Santiago, Región Metropolitana, Chile
  • 8University of Chile, Av Libertador Bernardo O'Higgins 1058, Santiago, Región Metropolitana, Chile

Abstract. 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 (20s 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.

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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 possibility of applying this to tsunami hazard alarm using single-site ground motion observation.
One of the quickest means of tsunami evacuation is transfer to higher ground soon after strong...
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