Development of an integrated earthquake early warning system in Taiwan - Case for the Hualien area earthquakes

In order to explore the feasibility of an earthquake early warning system f or Taipei, two prototype seismic early warning systems have been implemente d in Hualien, about 120 km away. The Taiwan Rapid Earthquake Information Re lease (TREIRS) can routinely determine earthquake location and magnitude in about one minute after the earthquake occurred. However, this reporting ti me is too long for earthquake early warning purposes. A dense, real-time mo nitoring system composed of 8 strong-motion stations was installed in Huali en area for testing earthquake early warning capability. For the 27 earthqu akes occurred during August 1998 to April 1999, this system has successfull y reported earthquake information in about 18 sec after the origin time. Th erefore, it provided about 15 sec of early warning time before shear waves arrival in the Taipei urban area. Based on our experience of these two syst ems, we are encouraged to proceed forward in the development of an earthqua ke early warning system.