2024-03-29T07:00:11Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00028001
2022-12-15T03:57:55Z
453:456
503:836:1555:1561
三面川上流・朝日山地奥三面地域の第四紀末期の遺跡,河成段丘とネオテクトニクス
三面川上流・朝日山地奥三面地域の第四紀末期の遺跡,河成段丘とネオテクトニクス
The developmental processes of river terraces since the latest Pleistocene, with reference to neotectonic movements at the Okumiomote area in the Asahi Massif, Central Japan.
高浜, 信行
大塚, 富男
Brahmantyo, Budi
Holocene river terrace
Glacial eustasy
Neotectonic movement
Old seismic records
Seismic upheaval
完新世河成段丘
氷河性海面変動
活構造運動
古地震痕
地震隆起
The Miomote River, which flows from the mountains of Asahi Massif and out to the Sea of Japan comprises of many levels of river terraces in the upstream area of Okumiomote. 13 levels of terraces can be classified, which formed since the Last Glacial Maximum until the present. The relative height from the present riverbed of the highest Tarukuchi Terrace is 42 m. The authors accompanied with archeological works by the Educational Board of Asahi Village, Niigata Prefecture, carried out terrace classification. The highest Tarukuchi Terrace formed at the Last Glacial Maximum and the lower 12 terraces are erosion terraces with a few meters thick of terrace deposits. No accumulation terraces can be found. These facts show that the terrace forming process was independent from the glacial eustasy since the Last Glacial Maximum. The relative heights of each terrace indicate the amount of erosion, due to the intermittent down cutting of the Miomote River. This may have been strongly controlled by the seismic upheaval of this area. In particular, 9 levels of strath river terraces formed around 6ka and 5 levels since about 2ka. Old seismic records such as liquefaction, ground fracturing, landslides are found in some terrace deposits and/or terrace surface. The age of old earthquakes are around 6ka and 2ka. Active period of uplift and relative calm period of uplift can be recognized between the relationship with relative heights and age of the Holocene terraces of this area (as indicated from uplift rate curve). Between 6ka-5ka and since 2ka until the present were active periods, and between 5ka-2ka was a relative calm period. The inconsistent uplift movement in the Holocene is a principle topic for prediction of earthquakes and clarifying detailed neotectonic movements.
新潟大学積雪地域災害研究センター
2000-03
jpn
departmental bulletin paper
http://hdl.handle.net/10191/39222
https://niigata-u.repo.nii.ac.jp/records/28001
AN00183327
03877892
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
22
1
16
https://niigata-u.repo.nii.ac.jp/record/28001/files/22_1-16.pdf
application/pdf
2.1 MB
2019-08-20