CNN News: 地震警报

If you`re in the epicenter of an earthquake, you`re going to get no warning. There`s no time for that. The warning depends on the distance you are to the earthquake epicenter.

若地震时，你处于震中，你不会得到任何警示。因为你没有时间。你得到的警告取决于你距离地震的距离。

An early warning system for earthquakes is expensive and also complex. Part of the problem is we don`t have a system that can predict the earth is going to move. Our warming system is based on the fact that the earth is already moving and then if you`re farther away from that epicenter, we can give you some time to prepare. It`s a minor time but some time.

早期的地震预警系统价钱昂贵并非常的复杂。现在面临的部分难题是因为我们没有预测地震走向的系统。我们预警系统是基于地震已经发生，如果距离震中位置较远，你还有准备的时间。但只是一小段时间。

Unlike a tornado warning where Doppler Radar can see the rotation and issue a warning before the tornado, an earthquake warning happens when the earthquake is already shaking. Another limitation is how close the sensor is to the epicenter. If the sensor is 10 miles away from the epicenter, it takes five seconds to get to that sensor. So, the more sensors we get, the better the lead time we`ll get as well.

地震警报和龙卷风的警报不同，因为多普勒雷达在龙卷风发生之前可以侦测到气流旋转，并发布警报。地震警报发送的时候，已经发生地震了。另一个限制是震中距离传感器的距离。如果传感器距离震中10公里远，传感器感知震感需要耗时5秒。所以，我们配置的传感器的数量越多，我们获得的时间越精确。

If we get 10 seconds notice of an earthquake that`s happening, especially a big one, you can open up the elevators on the nearest floor. You can stop trains. You can stop all those things that are moving before the shaking gets there.

如果地震发生时，你有10秒的时间，这时，你可以打开最近楼层的电梯。你可以停止火车，。你可以停止震感传到这里之前，所有正在移动的物体。

This entire system works because of the speed of light, or the speed of the warning going down the line, is 186,000 miles per second. The earth as it`s wiggling and shaking along is going at 2 miles per second.

整个系统的工作原理,因为光速,或警告传播的速度,是每秒186000英里。地球的摆动和振动的速度是每秒2英里。

So, if you`re 30 miles away, your warning could be 15 seconds. It`s 15 seconds that could save your life.

所以啊，如果你距离震中30英里远，你自己的警示时间就是15秒。这15秒就能挽救你的生命。