贝加尔湖裂谷系地震活动的分形维数和区域:对现代地球动力学的启示

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
A.V. Klyuchevskii , V.M. Dem'yanovich , F.L. Zuev , A.A. Klyuchevskaya , A.A. Kakourova , A.A. Golovko
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引用次数: 0

摘要

利用50年来(1964-2013)52,700次≥2.5级MLH的仪器数据,估算了贝加尔湖裂谷系(BRS)的分形几何形状和地震活动程度。地震模式的特征是箱计数Hausdorff维数D0、多重分形谱f(α)和地震活跃性表面积S在三个尺度上:裂谷系统作为一个整体,它的三个带和六个子带。多重分形谱记录了BRS地震活动性模式的自相似层次结构。分形维数(D0)和地震活动性面积(S)随时间的变化表现出较好的相关性。这两个参数取决于三个相关因素:仪器数据量的逐步增加(数据集大小)、发震断层网的结构和地球动力学活动。随着时间的推移,出现的资料越来越多,它们的局部值也越来越高,地震的范围和密度也越来越大。除裂谷两侧的一个带和一个亚带外,大部分地区的地震模式在统计上的自相似性在≈1.45-1.55之间。在裂谷系的西南部最大,东北部最小(D0≈1.60±0.02,D0≈1.37±0.02)。这种差异表明,发震断裂发生的机制不同:西南侧翼全球尺度碰撞压缩和区域裂陷叠加造成的分布破坏,以及东北侧翼准线性裂陷传播的结果。总的来说,在BRS的东北部,D0减小,在那里,地震的模式变得沿着界线局部化,而不是分布在一个地区。地震资料显示的D0和S的时空变化与裂谷吸引子的位置和活动脉冲一致,为裂谷吸引子的地球动力学和构造物理提供了现实的解释。全球岩石圈的压缩和区域裂谷吸引子的脉动活动控制着发震断裂网,而发震断裂网又控制着该地区地震活动性的分形几何和二维结构。得到的结果证实了区域地震活动性的年代际振荡动力学与裂谷吸引子的活动脉冲相关。这种振荡在全球低频地震活动周期减少的背景下更为突出。BRS岩石圈地球动力学符合具有耗散的非线性振子模型。分形几何和地震活动程度作为断裂演化的代用物的分析,为贝加尔湖裂谷系及其组成部分的现代地球动力学提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fractal dimension and area of seismicity in the Baikal Rift System: Implications for modern geodynamics

Fractal dimension and area of seismicity in the Baikal Rift System: Implications for modern geodynamics

The fractal geometry and extent of seismicity in the Baikal Rift System (BRS) are estimated from data on 52,700 instrumental events of MLH ≥ 2.5 magnitudes for fifty years (1964–2013). The seismic pattern is characterized by the box-counting Hausdorff dimension D0, multifractal spectra f(α), and surface area S of seismicity at three scales: the rift system as a whole, its three zones, and six subzones. The multifractal spectra record a self-similar hierarchical structure of the BRS seismicity pattern. The space and time variations in the fractal dimension (D0) and area of seismicity (S), which are mapped and plotted as a function of time, show good correlation. The two parameters depend on three related factors: progressive increase in the amount of instrumental data (dataset size), structure of seismogenic fault network, and geodynamic activity. They increase as ever more data appear with time and acquire high local values at increasing extent and density of quakes. Moreover, the obtained D0 estimates reflect statistical self-similarity of earthquake patterns being in the range ≈ 1.45–1.55 over most of BRS, except one zone and one subzone in the rift flanks. They are the highest in the southwest and the lowest in the northeast of the rift system (D0 ≈ 1.60 ± 0.02 and D0 ≈ 1.37 ± 0.02 respectively). This dissimilarity indicates that seismogenic faulting occurs by different mechanisms: distributed failure as a result of superposed global-scale collisional compression and regional rifting in the SW flank and quasi-linear rift propagation in the NE flank. In general, D0 decreases toward the northeastern part of the BRS, where the pattern of earthquakes becomes localized along lineaments instead of being distributed over an area. The space and time variations of D0 and S revealed in the earthquake data are consistent with the location and activity pulses of rifting attractors and provide a realistic explanation of BRS geodynamics and tectonophysics. The global lithospheric compression and the regional pulse-like activity of rifting attractors control the network of seismogenic faults which, in turn, govern the fractal geometry and 2D structure of seismicity in the region. The obtained results confirm the oscillatory dynamics of the regional seismicity at a decadal period correlated with activity pulses of rifting attractors. The oscillations stand out against the background of decreasing global low-frequency secular cycle of the BRS seismicity. The BRS lithospheric geodynamics fits the model of a nonlinear oscillator with dissipation. The suggested analysis of the fractal geometry and extent of seismicity as proxies of the faulting evolution provides insights into modern geodynamics of the Baikal Rift System and its constituents.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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