Abstract

INTRODUCTION After the Kobe (Hyogoken-nanbu) earthquake of 1995, the Japanese government decided as an action plan in 1995 to increase the density of strong-motion observation stations, to upgrade the observation network, and to release future strong-motion records as soon as possible. The National Research Institute for Earth Science and Disaster Prevention (NIED) of the Science and Technology Agency was given the responsibility to implement the program. Kyoshin Net (K-NET) is a product yielded from this one-year program. The word Kyoshin stands for strong ( Kyo ) quake ( shin ). The K-NET is a system which transmits strong-motion data on the Internet, data which are obtained from 1,000 observatories deployed all over Japan. The K-NET was constructed on the basis of three policies. (1) The first is to carry out systematic observation. All of the K-NET stations use the same seismograph, K-NET95, and they are all installed at free-field sites. (2) The second is...

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