Abstract
Some earthquake traces were discovered at around the embankment of outside moat of the Edo castle in a series of the remain investigation for the Yotsuya-Gomongai of the Edo castle at Yotsuya, Shinjuku, Tokyo. Sand dikes, fissures and a landslide were recognized as earthquake traces. According to site investigation, sounding and soil analysis for grain size, heavy metal and diatom, it was confirmed that source of supply of sand dykes was Tokyo Formation sand layer which is Pleistocene. The earthquakes induced the traces was specified from stand points of archaeology, seismology and geotechnical earthquake engineering. It was shown that Pleistocene, so called diluvial deposit, which had been thought hard to liquefy, could liquefy under severely strong motions.
