Earthquake can be destructive. Unfortunately, we don't have a (rely) way to predict. But technologies can still help us under such a desperate situation. China is building the world's largest earthquake alert system and it's (possible) the most advanced. Engineers (set) up over 15,000 sensors nationwide and wiring them into a web. an earthquake happens, the sensors can send electrical pulses to the control center and then ordinary people's smart-phones.
The signal travels at almost light speed and faster the earthquake shaking, giving local people a little time to prepare. The system sends messages to people (little) than two seconds after the earthquake happens. It's life-saving. The system, can be the most advanced in many ways, will be the largest earthquake observation network in the world, not only (detect) the movement of the continents but also calculating the possible impact of an earthquake. It will automatically warn local people, making much faster than human observation. The system, overseen by China's Ministry of Emergency Management, is set (complete) by the end of this year.
