Author(s)

Y. Ariga, Y. Fujinawa, N. Kawakami, T. Ohsumi & T. Nishino

Abstract

Recently, the magnitude of earthquakes and the location of epicenters have come to be estimated urgently in 3–4 seconds based on the observed data of a P-wave. Urgently estimated earthquake information is termed the real-time earthquake information. Furthermore, an arrival time and an intensity of the S-wave can be estimated and people informed before the arrival of the main shock. Such earthquake information before the arrival of the main shock is defined as the early earthquake warning. In this study, we have developed an immediate evaluation method for earthquake damage of dams by combining the early earthquake warning and a 3-D dynamic analysis. As a result, the earthquake damage of dams can be evaluated by the method proposed within one second. This method is useful to mitigate not only human disaster but also physical damage by earthquakes. Keywords: dam safety, earthquake damage, real-time, 3D dynamic analysis, immediate evaluation, the early earthquake warning. 1 Introduction Verification of seismic safety of dams against very large earthquake is very important theme. In Japan, the seismological observation networks such as the Hi-net(High sensitivity seismograph network), the KiK-net(Kiban kyoshin Network), the K-NET(Kyoshin network), the seismic intensity observation network, and so forth have been densely arranged by the Ministry of Education

Keywords

dam safety, earthquake damage, real-time, 3D dynamic analysis, immediate evaluation, the early earthquake warning.