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内容記述 |
Taiwan located at circum-Pacific seismic belt and the junction of the Eurasian plate and Philippine Sea plate. In average, more than 4000 earthquakes occurred annually. However, with today's science and technology, the earthquake is still unable to estimate and evacuate the people in advance. As the source of seismic waves generated in the body of the earth, when the wave passes on the mantle through various distinct characteristics of the media, the wave velocity varied. The seismic waves can be divided into two kinds, P-waves and S-waves. The velocity of P-wave is about 5-7 (km / sec); the velocity of destructive S-wave is about 3-4 (km / sec). This research develops the on-site Earthquake Early Warning System (EEWS) by the physical characteristics of the P-wave velocity greater than S-wave velocity. The on-site EEWS only used the signal from the on-site sensor, the calculation time was less and suitable to provide earthquake early warning to the region which close to the epicenter. In the same time, the proposed on-site EEWS was integrated with the disaster reduction control system in a demonstration house and been tested on NCREE’s shake table. The integrated on-site EEWS can provide the early earthquake warning through broadcast, TV and LED text display. Also, it will automatically park the elevator, shut-off the gas, switch the power, open the door and turn on the light of the escape route. Combine the on-site EEWS and disaster reduction control system, the life and economic loss can be greatly reduced. In the other hand, the on-site, long-term test results were also preceded. According to the validation test results, the proposed on-site EEWS can provide about 80% accuracy of the predicted intensity levels and at least 8 seconds response time around the epicenter region. |
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