Assessment and management on earthquake disasters in metropolitan taipei

This paper wants to suggest how to prevent and manage disasters caused by earthquake hazard in metropolitan Taipei. In front of them, we need to understand the major sources that may occur earthquakes near Taipei city. These sources include Shanchiao fault, crustal areal sources and subduction zones. Especially, Shanchiao fault has been reinvestigated recently, its length which includes inland and offshore portions approzimated 80 kilometers and could occur earthquakes with maximum moment magnitude till 7.2. In terms of the new investigating data, this paper estimated seismic hazard and finished the 475 or 2475 return period PSHA distribution map in metropolitan Taipei. Our research also did the scenario of Shanchiao fault rupturing and occurring earthquake Mw7.2. According to the renewal parameters of Shanchiao fault, this research considered the hanging wall effect and adopted the latest ground motion attenuation formula to estimate the earthquake loss by using Taiwan Earthquake Loss Estimate System (TELES). The issues of earthquake loss include the number of casualties, building collapse and fire occurrence. This paper also compared the difference of loss result between the earlier seismic source parameters and this study. Our result shows that the hanging wall effect and the increase of earthquake magnitude obviously cause the higer damage and loss in metropolitan Taipei. The number of casualties is the most in Shihlin District, and the second in Beitou District. The number of fire occurrence is the most in Beitou and Shihlin District, and the second in Chungshan and Tatung District. This paper also illustrated the secondary disasters after a big earthquake in metropolitan Taipei. The high potential location distribution of liquefaction and landslides were been discussed. Finally, we suggested the strategy of disaster prevention and management. The results of this paper can be an useful reference in disaster prevention plan for Taipei city.