用最快、最有效的方法向社会发出即将（或正在）发生地震的通知或信号。
那是发自乘客们手机上的地震警报，预示着下一场地震正在临近。
It was the earthquake warning alarms of the passengers' cellphones indicating that another temblor was imminent.
地震警报系统提供的警告只有几秒钟，但这足以让人采取保护措施。
Earthquake alert systems furnish only a few seconds of warning, but that can be enough time for people to take protective measures.
TED提供的地震警报时间比地震仪确认的信息提前了一半。
About half the time, TED provides earthquake alerts before seismometers can confirm them.
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