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北西太平洋地域における大地震の移動および発生サイクルと応力伝播に関する研究

西北太平洋地区大地震运动、发生周期与应力传播研究

基本信息

批准号：
03640366
负责人：
三雲健
金额：
$ 0.51万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至无数据
项目状态：
已结题

项目摘要

1.この研究では、北西太平洋地域のうち、日本海溝日本列島周辺日本海中国北部に発生した過去100年間のM【greater than or similar】5.5の浅発・中深発・深発大地震の発生位置,深さ,時系列などを系統的に解析して,これら地震の移動現象の存在を明らかにするとともに,リソスフェア,アスセノスフエアおよび沈み込むプレ-トより成る造構的モデルにもとづいて移動現象の物理的メカニズムの考察を行った。主な結2.(1)日本海溝に発生したM【greater than or similar】7.5の大地震後、地震活動は日本列島及び日本海下に沈み込む太平洋プレ-トの上面に沿って下方へ移動し、最深部の約600kmに達する。1896年以後このような5回サイクルが認められ、1サイクルに22年〜27年を要し、この約10年後に中国北部に浅発大地震が起ることが確かめられた。(2)線形粘弾性的リソスフェア及びクリ-プ則に従う非線形群塑性型アスセノスフエアの構造に温度・圧力の深さ分布を考慮し、3次元有限要素法による計算を行った結果、プレ-トの進行に伴う応力は最初40kmの深さの固結部分を破壊し、次にでこれによる弾性的応力変化とクリ-プ歪の緩和が300〜500kmの深さまで伝播して、こゝで応力降下量の大きい深発地震を発生させるこ(3)また沈み込むプレ-トの上面の海洋性地穀内で剪断破型深発地震が発生した場合、応力変化は断層周辺では比較的大きいのに反し、上部マントルから地穀部分へは伝播しにくく,この直上の地域で起る浅発大地震の発生を説明することは難しいことが分った。(4)大陸性地穀内で発生する大地震の断層動的破壊過程と地震後の応力回復過程を,地穀応力,断層強度,辷り摩擦応力の深さ分布を含む3次元モデルによって数値計算を行った。この結果,大地震の破壊核は完全脆性領域と半脆性領域の境界付近に形成されやすいこと,断層破壊の下限と断層辷り量は地穀内の温度分布に影響されることが解明された。

1. This research is conducted in the North Western Pacific Ocean region, Japan Trench, Japan Islands, Japan Sea, North China, Japan Islands, China, Japan Islands, China, Japan, China, China, Japan, Japan A survey of the physical aspects of the phenomenon of migration in the structure of the planet The Lord 2. (1)After the Japan Trench earthquake occurred on July 5, the seismic activity moved upward along the Pacific Ocean under the Japan Islands and the Sea of Japan, reaching a depth of about 600km. After 1896, a shallow earthquake occurred in northern China about 10 years later. (2)For linear viscosities, the temperature and pressure distributions in the structures of non-linear plastic groups are considered. The results of calculation by the three-dimensional finite element method are as follows: the first 40km depth of the consolidation part is broken, the second 40km depth of the consolidation part is broken, and the third 40km depth of the consolidation part is relaxed. The occurrence of deep earthquakes due to large force drops in the upper part of the oceanic valley is explained in the case of deep earthquakes due to shear breaks in the upper part of the oceanic valley, and in the case of large earthquakes due to large force changes in the upper part of the fault, and in the case of shallow earthquakes due to the occurrence of large earthquakes due to the occurrence of shallow earthquakes due to the occurrence of deep earthquakes due to the occurrence of shallow earthquakes due to the occurrence of shallow earthquakes due to the occurrence of deep earthquakes due to the occurrence of shallow earthquakes due to the occurrence of deep earthquakes due to the occurrence of deep earthquakes due to the occurrence of shallow earthquakes due to the occurrence of deep earthquakes due to shear breaks in the upper part of the oceanic valley. (4)The fault breaking process of a large earthquake occurring in a continental valley and the recovery process of seismic force after an earthquake are discussed. The deep distribution of valley force, fault strength and friction force is calculated by using three-dimensional numerical method. As a result, the fault core of a large earthquake is formed close to the boundary of a completely brittle region and a semi-brittle region, and the temperature distribution in the valley of the fault is affected by the lower limit of the fault rupture and the fault magnitude.