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首页> 外文期刊>Journal of Asian earth sciences >Rifting Attractor Structures in the Baikal Rift System: Location and Effects
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Rifting Attractor Structures in the Baikal Rift System: Location and Effects

机译：贝加尔湖裂谷系统中的裂谷吸引子结构：位置和作用

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The current geodynamics and tectonophysics of the Baikal rift system (BRS) as recorded in lithospheric stress and strain are discussed in the context of self organization of nonlinear dissipative dynamic systems and nonlinear media. The regional strain field inferred from instrumental seismic moment and fault radius data for almost 70,000 M_(LH) ≥ 2.0 events of 1968 through 1994 shows a complex pattern with zones of high strain anisotropy in the central part and both flanks of the rift system (the South Baikal, Hovsgoel, and Muya rift basins, respectively). The three zones of local strain anisotropy highs coincide with domains of predominantly vertical stress where earthquakes of different magnitudes are mostly of normal slip geometry. Pulse-like reversals of principal stresses in the high-strain domains appear to be nonlinear responses of the system to subcrustal processes. In this respect, the BRS lithosphere is interpreted in terms of the self organization theory as a geological dissipative system. Correspondingly, the domains of high strain anisotropy and stress change, called rifting attractor structures (RAS), are the driving forces of its evolution. The location and nonlinear dynamics of the rifting attractors have controlled lithospheric stress and strain of the rift system over the period of observations, and the same scenario may have been valid also in the Mesozoic-Cenozoic rifting history. The suggested model of a positive-feedback (fire-like) evolution of nonlinear dynamical systems with rifting attractors opens a new perspective on the current geodynamics and tectonophysics of the Baikal rift system.
机译：在非线性耗散动力系统和非线性介质的自组织情况下，讨论了岩石圈应力和应变中记录的贝加尔湖裂谷系统（BRS）当前的地球动力学和构造物理。从仪器地震矩和断层半径数据推论的1968年至1994年近70,000 M_（LH）≥2.0事件的区域应变场显示出一个复杂的模式，在中部和裂谷系统的两侧都有高应变各向异性的区域（南贝加尔湖，霍夫斯高尔和穆亚裂谷盆地）。局部应变各向异性高的三个区域与主要为垂直应力的区域重合，在这里，不同震级的地震大多具有正常的滑动几何形状。高应变域中主应力的脉冲状逆转似乎是系统对子壳过程的非线性响应。在这方面，根据自组织理论将BRS岩石圈解释为地质耗散系统。相应地，高应变各向异性和应力变化的区域称为裂隙吸引结构（RAS），是其演化的驱动力。在观察期内，裂谷吸引子的位置和非线性动力学控制了裂谷系统的岩石圈应力和应变，并且在中新生代裂谷历史中，同样的情况可能也是有效的。带有裂隙吸引子的非线性动力学系统的正反馈（类火）演化模型建议为贝加尔湖裂谷系统的当前地球动力学和构造物理学提供新的视角。

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