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Stand-alone tsunami alarm equipment

机译：独立式海啸报警设备

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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 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.
机译：海啸疏散的最快方法之一是在强烈而长时间的地面震动后立即转移到高地。地面震动本身就是从灾难性海啸中撤离的良好启动器。较长周期的地震波被认为与地震震级的相关性更高。我们研究了其在海啸灾害警报中的应用，使用单点地震动观测。大地震后不久，由于停电，有时无法获得大众媒体的信息。即使有官方警报，海啸警报的多个信息来源也会帮助人们意识到即将到来的海啸风险。因此，一个在不需要其他数据的情况下指示海啸风险的设备将对那些应该撤离的人有所帮助。由于低成本MEMS（微机电系统）加速度计的灵敏度足以满足此目的，因此可以很容易地实现家用海啸报警设备。基于震级、海啸高度、震中距离和地震波峰值地面位移之间的经验关系，提出了长周期（20 s截止）位移幅度作为警报阈值。将这种方法应用于最近的大地震表明，这种设备可以有效地提醒人们注意海啸的可能性。

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