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(2) wxy·¸ 8 !. ¹ "º»¼½. ,**1 / : 1 ; ,**2 - : ,. ;. Eruptions and Earthquakes Occurred along Amurian Plate Eastern Margin in the 3th Century Masashi TSUKUI῍, Shun NAKANO῍῍ and Koichiro SAITO῍῍῍ Based on geological and archaeological data as well as historic documents, we review eruptions and earthquakes which have occurred during the 3th century in central and east Japan. The results reconfirm vigorous activities on Izu Arc, Izu-Oshima (2-2 AD N-, N,, N+ 220 AD), Niijima (2/1 AD and 220 AD), Kozushima (2-2 AD), Miyakejima (2-, AD and 2/* AD), and at Fuji volcano (2** AD, 2-2 AD 20. AD, 20. AD) during the 3th century. Beside these events, a big eruption of Niigata Yakeyama volcano had likely occurred in 221 AD. Chokai volcano also erupted in 21+ AD, and 2+*ῌ2,- AD. Collapse of Yatsugatake volcano took place in 221, probably invoked by a strong shock in 221. In addition, earthquakes with a magnitude from 1 to 2 had taken place along the Itoigawa-Shizuoka active fault system (in 2.+ or 10, AD), Nagano fault system (221 AD), Echigo plains (20- AD), Shonai plains (2/* AD), Akita plains (2-* AD) and Nankai trough (221 AD). As a result, we can point out a linkage of big eruptions and seismic activities in the 3th century over 2**km long crossing Japan Arc. Geologically this seems to be a surface expression of East-West compression along eastern margin of Amurian Plate over 2**km which was driven by the eastward motion of the plate. It is noteworthy to mention that the very similar volcanic and seismic activities have been occurring in the last /* years to those happened in the ninth century, in their source areas and manners. Key words : 3th century, eastern margin of Amurian plate, boundary between Northeast and Southwest Japan, linkage of eruption and earthquake, east-west compression. +ῌ ῐ ῎ ῑ ῏. <=>?@A

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