沈み込み水循環の新パラダイム：unbendingによるアセノスフェアからの上昇流

俯冲水循环的新范例：由于不弯曲而从软流圈向上流动

• 批准号: 19K21892
• 负责人: 川勝 均
• 金额: $ 3.58万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Research (Exploratory)
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-06-28 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19K21892/
• 关键词: 沈み込み; スラブ; 地球内部水循環; 海底地震観測; レシーバー関数; 地震波トモグラフィー; 水循環

本研究は，沈み込み帯における水循環に関して，多様な「地球内部流体の移動」の可能性を観測データから解明し，地球内部物質循環研究における新たな展開を目指すものである．具体的には，沈み込む「スラブ下」のアセノスフェアからの水が上昇する経路があり，プレート上面や，大地震が起こるプレート境界へ水を供給している可能性を地震観測データから検証することを目指す．またその原因は，メカニカルな起源を持つプレート沈み込みプロセスunbendingと関連している可能性を解明する．スラブのunbendingが起こる領域は，沈み込み帯の海溝軸から陸域までの間の海底下の領域である．従って本研究の目的を果たすためには，海底地震計のデータを使い構造解析をすることが必須となる．本研究では，大学の海底地震観測グループおよびケーブル海底地震観測網S-netのデータを，豊富かつ高質な陸上データと併せて解析し，東北沈み込み帯前弧下等の地殻・マントル構造とその動態を明らかにすることを目標とする．第四年度の２０２２年度は，これまでに収集した海陸観測網の波形データを使い以下の研究を継続的に進めた．（１）これまでの研究から明らかとなった，海洋下におけるレシーバー関数解析や有限周波数走時トモグラフィー解析において顕著な障害となる海洋堆積層の構造を決定する手法開発を行う，（２）波形から走時を読み取り，有限周波数走時トモグラフィー解析を行う．

In this study, Shen Yun made a study of the possibility of fluid movement in the interior of the earth. In this study, the possibility of fluid movement in the interior of the earth was studied. In this study, a new model of the earth's interior is developed in order to understand the possibility of fluid movement in the interior of the earth. The cause of a major earthquake is the origin of a large earthquake. The origin of a large earthquake is related to the possibility of a large earthquake. The source of a large earthquake is caused by a large earthquake. The origin of a large earthquake is caused by a large earthquake. The origin of a large earthquake is caused by a large earthquake. The origin of a large earthquake is caused by a large earthquake. The origin of a large earthquake is caused by a large earthquake. The origin of a large earthquake is caused by a large earthquake. The origin of a large earthquake is caused by the possibility of a large earthquake. The origin of a large earthquake is caused by the possibility of a large earthquake. The origin of a large earthquake is caused by the possibility of a large earthquake. The origin of a large earthquake is caused by the possibility of a large earthquake. The origin of a large earthquake is due to the possibility that it is possible to understand the possibility of an unbending accident. The purpose of this study is to determine the results of this study. The purpose of this study is to analyze the effects of submarine seismometry on the sea floor. In this study, it is necessary to determine the accuracy of the sea floor seismology. In this study, college students are involved in the study of submarine seismology. In the case of the rich, high-rise, high-rise, high-profile, high-speed, high-profile, high-temperature, high-temperature The analysis of the number of waves in the ocean, the analysis of the number of waves in the ocean.

项目成果

Sedimentary Structure Derived From Multi‐Mode Ambient Noise Tomography With Dense OBS Network at the Japan Trench

• DOI: 10.1029/2021jb021789
• 发表时间: 2021-04
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Lina Yamaya;K. Mochizuki;T. Akuhara;K. Nishida

High-resolution seismic constraint on the seafloor sediments using the teleseismic body waves: towards deeper structure analysis using receiver functions

使用远震体波对海底沉积物进行高分辨率地震约束：使用接收器函数进行更深入的结构分析

• 发表时间: 2022
• 作者: HyeJeong Kim;Hitoshi Kawakatsu;Takeshi Akuhara;Nozomu Takeuchi
• 通讯作者: Nozomu Takeuchi

Towards continuous seismic imaging from offshore to land along the Japan trench: effects of offshore structures (sediment layers and lateral heterogeneities)

沿着日本海沟从近海到陆地的连续地震成像：近海结构的影响（沉积物层和横向不均匀性）

• 发表时间: 2020
• 作者: Kim HyeJeong;Kawakatsu Hitoshi;and Akuhara Takeshi
• 通讯作者: and Akuhara Takeshi

Receiver Function Imaging of the Amphibious NE Japan Subduction Zone—Effects of Low‐Velocity Sediment Layer

• DOI: 10.1029/2021jb021918
• 发表时间: 2021-08
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Hyejeong Kim;H. Kawakatsu;T. Akuhara;M. Shinohara;H. Shiobara;H. Sugioka;R. Takagi

Continuous imaging of the subducting Pacific under Japan using receiver function analysis of the amphibious array data

使用两栖阵列数据的接收器函数分析对日本下方的俯冲太平洋进行连续成像

• 发表时间: 2019
• 作者: Kim;HJ;H. Kawakatsu;T. Akuhara;M. Shinohara;H. Shiobara;H Sugioka;R. Takagi
• 通讯作者: R. Takagi