Development of earthquake early warning system in Taiwan
Development of earthquake early warning system in Taiwan
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DOI：
10.1029/2008gl036596
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发表时间：
2009-01-30
影响因子：
5.2
通讯作者：
Teng, Ta-Liang
中科院分区：
文献类型：
--
作者：
Hsiao, Nai-Chi;Wu, Yih-Min;Teng, Ta-Liang
随着中央气象局（CWB）实施实时强震监测网，台湾已发展出地震预警系统（EEW）。为了缩短地震响应时间，在第一阶段采用了基于区域预警方法的虚拟子网方法。自2001年以来，该EEW系统共响应了发生在台湾内陆或近海的225次震级大于4.5级的地震。该系统能够在地震发生后20秒内发布地震报告，并对高达6.5级的事件进行良好的震级估计。目前，CWB系统采用P波方法。根据实时强震台网记录到的596次M ≥ 4.0地震的结果，我们发现初始P波的峰值位移幅值（P-d）可以用来识别M ≥ 6.0的地震。初始P波的特征周期τ（c）和τ（max）（p）可用于震级测定，不确定度小于0.4。我们希望在不久的将来，台湾的EEW系统能够达到10秒的响应时间。引文：Hsiao，N.- C.的方法，Y.-- M.吴，T- C.申湖，澳-地Zhao和T.- L. Teng（2009），台湾地震预警系统的发展，地球物理。保留信函：36，L00B02，doi：10.1029/2008GL036596。
With the implementation of a real-time strong-motion network by the Central Weather Bureau (CWB), an earthquake early warning (EEW) system has been developed in Taiwan. In order to shorten the earthquake response time, a virtual sub-network method based on the regional early warning approach was utilized at first stage. Since 2001, this EEW system has responded to a total of 225 events with magnitude greater than 4.5 occurred inland or off the coast of Taiwan. The system is capable of issuing an earthquake report within 20 sec of its occurrence with good magnitude estimations for events up to magnitude 6.5. Currently, a P-wave method is adopted by the CWB system. Base on the results from 596 M >= 4.0 earthquakes recorded by the real-time strong-motion network, we found that peak displacement amplitudes from initial P waves (P-d) can be used for the identification of M >= 6.0 events. Characteristic periods tau(c) and tau(max)(p) of the initial P waves can be used for magnitude determination with an uncertainty less than 0.4. We expect to achieve a 10-second response time by the EEW system in Taiwan in the near future. Citation: Hsiao, N.-C., Y.-M. Wu, T.-C. Shin, L. Zhao, and T.-L. Teng (2009), Development of earthquake early warning system in Taiwan, Geophys. Res. Lett., 36, L00B02, doi: 10.1029/2008GL036596.