@article{oai:niigata-u.repo.nii.ac.jp:00027994,
 author = {高浜, 信行 and 卜部, 厚志 and 布施, 智也},
 journal = {新潟大学積雪地域災害研究センター研究年報, 新潟大学積雪地域災害研究センター研究年報},
 month = {Dec},
 note = {Recently, several paleo-earthquake induced liquefaction structures from the Nara-Heian period (approx. 9th century) have been discovered in the Echigo Plain. During this period, a wake of concentrated large-scale earthquakes may have occurred in this area. In this report, liquefaction and rupture structures confirmed at the Yoshida and Tsubame archaeological sites in the central area of the plain are described. Liquefaction structures dated to be approx. 7-8th century have been confirmed at Kosuwamae A site, approx. after 7-8th century at Kosuwamae B and Sankakuda sites and approx. 9th century at Ohashi and Kitashowaki sites. At the Kosuwamae B site, liquefaction occurred at two different periods and at the Ohashi site a 9th century liquefaction can be confirmed with two stages of sand eruption indicating the main earthquake followed by the aftershock. At the Kitasho-waki site, there is a 7-8m wide rupture zone with several sand dykes where the bedding completely destroyed. It is thought that an earthquake fault must be near by or possibly a massive tremor must have occurred. Up to now, several 9th century liquefaction structures have been discovered in the northern and southern areas of the Echigo Plain. With new discoveries in the central area, there seem to be a possibility that they may be distributed throughout the plain.},
 pages = {45--52},
 title = {越後平野中部における古代・9世紀前後の液状化 : 新潟県における歴史地震の液状化跡 : その2},
 volume = {23},
 year = {2001}
}