Spatio-temporal distribution of coupled area preparing Tokai Earthquake -Interaction between coupled and decoupled zones-

东海地震耦合区的时空分布 -耦合区与解耦区的相互作用-

• 批准号: 23740336
• 负责人: IKUTA Ryoya
• 金额: $ 2.41万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23740336/
• 关键词: 地殻変動; 海底変動; プレート境界の固着分布; アスペリティ; スロースリップ; GPS; 南海トラフの巨大地震; 固着; 遷移域; 南海トラフ; プレート境界

We studied spatiotemporal distribution of inter-plate coupling beneath the Nankai Trough using three dimensional GPS coordinates. First we developed an effective method to remove common mode error between time series of different GPS stations. Next we took difference between a couple of every 10 days-long averages with a gap of 1 week. The difference data set was used to deduce inter-plate coupling distribution by Bayesian inversion method. As a result, we successfully detected short-term slow slip events associated with activations of deep low frequency tremors occurring at down dip extension of the coupled area. Long term slow slip events beneath Lake Hamana and Bungo Channel as well as constant draggingby the subducted slab were also detected.

利用三维GPS坐标研究了南海海槽板块间耦合的时空分布。首先，我们开发了一种有效的方法来消除共模误差之间的时间序列不同的GPS站。接下来，我们将每10天的平均值与1周的差距进行比较。利用差分数据集，采用贝叶斯反演方法，反演板间耦合分布。因此，我们成功地检测到短期缓慢滑动事件与激活的深低频震颤发生在下倾延伸的耦合区域。在滨名湖和丰后海峡下的长期缓慢滑动事件以及俯冲板片的持续拖曳也被检测到。

项目成果

Relation between the interplate coupling distribution before and the slip at the time of the 2011 East Japan Earthquake (Mw 9.0)

2011年东日本地震（Mw 9.0）之前的板间耦合分布与滑移的关系

• 发表时间: 2011
• 作者: Ryoya Ikuta;Seiichi Shimada;Mikio Satomura
• 通讯作者: Mikio Satomura

Monitoring of coupling distribution and small Short-term SSEs in southwest Japan based on GEONET data

基于GEONET数据的日本西南部耦合分布和小型短期SSE监测

• 发表时间: 2011
• 作者: Fujita A.;R. Ikuta;M. Satomura;S. Shimada;T. Kato
• 通讯作者: T. Kato

2011 年東北地方太平洋沖地震の小さく強いアスペリティ

2011年东北地震太平洋沿岸小而强的凹凸不平

• 发表时间: 2011
• 作者: Kita;S.;A. Hasegawa;J. Nakajima;T. Okada;T. Matsuzawa;and K. Katsumata;生田領野,里村幹夫,藤田明男,島田誠一
• 通讯作者: 生田領野,里村幹夫,藤田明男,島田誠一

A small persistent locked area associated with the 2011 Mw9.0 Tohoku-Oki earthquake, deduced from GPS data

根据 GPS 数据推断出与 2011 年 Mw9.0 Tohoku-Oki 地震相关的小型持续锁定区域

• DOI: 10.1029/2012jb009335
• 发表时间: 2012
• 期刊: J. Geophys. Res
• 作者: Ikuta;R.;M. Satomura;A. Fujita;S. Shimada;and M. Ando
• 通讯作者: and M. Ando

Inversion of interplate coupling beneath Tokai region using GEONET data

利用GEONET数据反演东海地区下方板间耦合

• 发表时间: 2011
• 作者: R. Ikuta;M. Satomura
• 通讯作者: M. Satomura