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首页> 外文期刊>Annals Of Geophysics >Recent Seismotectonic Stress Regime of most Seismically active zones of gulf of Guinea and its Kinematic implications on the adjoining sub-Sahara west African region
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Recent Seismotectonic Stress Regime of most Seismically active zones of gulf of Guinea and its Kinematic implications on the adjoining sub-Sahara west African region

机译：几内亚海湾湾大多数地震活动区的最近地震局部应力制度及其对邻近撒哈拉西非地区的运动学影响

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The Tectonic stress regime of Gulf of Guinea region has been studied by stress tensor inversion analysis for the area bounded by lati? tude ?10.0 0 S to 4.0 o N and longitude ?25 0 W to ?11.0 0 E. A total of one hundred and four focal mechanism solutions, pertaining to the earthquake events which have occurred in this region, were used for this study. In order to decipher the stress pattern of this region, we have divided the region into four fracture zones namely Romanche, Chain?Romanche, Charcot and Ascension fracture?zones based on seismicity clustering, tectonics and available focal mechanism solutions. The seismicity pattern indicates that none of the nearby coun? tries on the border line between the west Africa region and the gulf of Guinea is devoid of seismicity. Simultaneously, the stress tensor inversion in the four subzones of investigation indicates different types of stress orientations. All of these zones are characterized by vary? ing principal axial directions. The orientation of the principal axial direction along Romanche, Chain?Romanche, Charcot and Ascen? sion fracture?zones are along NE?SW, NE?SW, ENE?WSW and ESE?WNW respectively. The stress tensor inversion results indicate that Chain?Romanche, Charcot and Ascension fracture zones are characterized by extensional stress regime while Romanche fracture zone is characterized by strike?slip stress regime respectively. These patterns imply sea floor spreading activities in and around the mid oceanic ridges and the general orientation of the extensional stress regime is found towards the continents, along the line of migration / progression of earthquakes.
机译：由拉提界限的区域的应力张量反演分析研究了几内亚区域湾的构造压力制度？ TUDE？10.0 0 S至4.0 O N和经度Δ250W到？11.0 0 E.总共有一百和四个焦点机制解决方案，与该地区发生的地震事件有关，用于本研究。为了破译该地区的应力模式，我们已经将该区域分成了四个裂缝区，即romanche，链条，基于地震聚类，构造和可用焦点机制解决方案的区域。地震表现形式表明附近没有哪些国家？试图在西非地区和几内亚海湾之间的边界线上缺乏地震性。同时，调查四个子区域中的应力张量反转表明了不同类型的应力取向。所有这些区域都有各种各样的特点？主轴向。沿romanche，链条，Charcot和Ascen的主轴向的定向？ Sion骨折？区域沿着NE？SW，NE？SW，ENE？WSW和ESE？WNW分别。压力张量反演结果表明链条？ROMANCHE，CHARCOT和提升断裂区域的特征在于延伸应力状态，而ROMANCHE骨折区域的特征在于分别的撞击应力制度。这些模式暗示了中海山脊的海底蔓延，沿着地震迁移/进展的大陆发现了大陆的延伸压力制度的一般取向。

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