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塩性湿地堆積物を用いた太平洋沿岸域の古地震周期復元とそれに対する海岸環境の応答

利用盐沼沉积物重建太平洋沿岸古地震期及其海岸环境的响应

基本信息

批准号：
01J07536
负责人：
澤井祐紀
金额：
$ 2.3万
依托单位：
International Research Center for Japanese Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01J07536/
关键词：
珪藻分析海水準変動古地震塩性湿地

项目摘要

平成14年度は,5月〜8月の4ヶ月間,英国北西部と北東部,米国・アラスカ州南岸塩性湿地群,米国・ワシントン州とオレゴン州において,古地震周期復元のための比較試料採集を行った.英国,米国・アラスカ州,オレゴン州においては,地震に伴った海水準変動の復元データベース作成の一環として表層堆積物の採取と植生調査を行った.採取した試料は,現地の研究者と共同で処理を行い,そこに含まれる珪藻類の組成変化を明らかにした.その結果,海水準変動の際に大きなノイズとなりえる数種を検出することができた.これは研究代表者が北海道で明らかにしてきた結果と同調的であり,日本で得られた結果は汎世界的なものであると考えられた.この作業と併せて,オレゴン州の塩性湿地において,ボーリングコア試料を採取し珪藻分析を行った.珪藻分析の結果をもとに,transfer function法を用いて海水準の定量復元を行った結果,層序境界付近において(1)隆起,(2)急激な沈降,(3)(2)の沈降後の回復(隆起の揺り返し),というサイクルが確認された.このサイクルのうち「(2)急激な沈降」と同時期に津波起源と考えられる異常な砂層が検出されたため,このサイクルは調査地における過去の地震性地殻変動の履歴であると考えられた.英国・米国で得られた結果を参考に,北海道東部の堆積物においても同様の傾向が見られるかどうかを検証するために,transfer function法による海水準の定量復元を行った.その結果,過去3000年間において北海道東部では,1緩やかな沈降,2沈降後の急激な隆起,が繰り返されていることが確認された.津波堆積物の存在などから,この繰り返しも地震性地殻変動によるものと考えられたが,同時にアメリカ西海岸と北海道では観測される変動形式が大きく違うことも確認された.

During the April months from May to August in Pingcheng, there are wetlands in the north west of the UK, tropical wetlands on the south coast of the United States, tropical provinces in the United States, and data sets in the paleo-earthquake cycle. In the United Kingdom, the United States, the United Kingdom, the United States, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States and the United Kingdom, the United Kingdom, the United States, the United States, the United Kingdom, the United States and the United Kingdom. The data is collected, and the local researchers are involved in the management of the industry, and the system contains the chemical composition of algae. The results show that the sea water is ready to send out several kinds of equipment. The research representative of Hokkaido said that the results were the same as those in Hokkaido, and that in Japan, the results were similar to those in the world. During the operation, the wetlands of the state should be monitored, and the materials should be collected for algae analysis. The results of algae analysis were satisfactory, and the transfer function method was used to determine the quantitative results of sea water. The sequence boundary was close to that of sea water. (1) uplift, (2) rapid sinking, (3) (2) sinking, (3) (2) sinking after sinking (uplift, uplift, and return). During the same period of time, the origin of Tsuha was examined in the same period. In the same period, there was a survey of the origin of the earthquake. In the same period, there was a survey of the origin of the earthquake in the same period. In the same period, there was a survey of the origin of the seismicity. In the United Kingdom, the United States has obtained a reference for the results of the results, the active materials in the Hokkaido Department of Hokkaido are the same as those in Hokkaido, and the transfer function method is used to determine the quantity of sea water. The results showed that in the past 3000 years, the train in Hokkaido had sunk during the first half of the year, and the storm rose after the sinking. There is an earthquake in the Jinbo reactor, and the earthquake response is due to the earthquake. At the same time, the Hokkaido earthquake is located on the west coast of Hokkaido and is in the form of an earthquake.