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Fractal dimension and lvalue mapping in the Andaman-Sumatra subduction zone

机译：安达曼-苏门答腊俯冲带的分形维数和左值映射

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The Andaman-Sumatra subduction zone is seismically one of the most active and complex subduction zones that produced the 26 December 2004 mega thrust earthquake (Mw 9.3) and large number of aftershocks. About 8,000 earthquakes, including more than 3,000 aftershocks (M > 4.5) of the 2004 earthquake, recorded during the period 1964-2007, are relocated by the EHB method. We have analysed this large data set to map fractal correlation dimension (Dc) and frequency-magnitude relation (fe-value) characteristics of the seismogenic structures of this 3,000-km-long mega thrust subduction zone in south-east Asia. The maps revealed the seismic characteristics of the Andaman-Sumatra-Java trenches, West Andaman fault (WAF), Andaman Sea Ridge (ASR), Sumatra and Java fault systems. Prominent N-S to NW-SE to E-W trending fractal dimension contours all along the subduction zone with Dc between 0.6 and 1.4 indicate that the epicentres mostly follow linear features of the major seismogenic structures. Within these major contours, several pockets of close contours with Dc 0.2 to 0.6 are identified as zones of epicentre clusters and are inferred to the fault intersections as well as asperity zones along the fault systems in the fore arc. A spatial variation in the b-value (1.2-1.5) is also observed along the subduction zone with several pockets of lowervalues (1.2-1.3). The smaller b-value zones are corroborated with lower Dc (0.5-0.9), implying a positive correlation. These zones are identified to be the zones of more stress or asperity where rupture nucleation of intermediate to strong magnitude earthquakes occurred.
机译：安达曼-苏门答腊俯冲带在地震上是最活跃，最复杂的俯冲带之一，产生了2004年12月26日的特大逆冲地震（Mw 9.3）和大量余震。 1964-2007年间记录​​的大约8000次地震，包括2004年地震的3,000多次余震（M> 4.5），通过EHB方法迁移。我们已经分析了这个大型数据集，以绘制该东南亚3,000公里长巨型逆冲俯冲带地震发生结构的分形相关维数（Dc）和频率-幅度关系（fe-value）特征图。这些地图揭示了安达曼－苏门答腊－爪哇海沟，西安达曼断裂（WAF），安达曼海岭（ASR），苏门答腊和爪哇断裂系统的地震特征。整个俯冲带的N-S到NW-SE到E-W趋势分形维数轮廓都突出，Dc在0.6到1.4之间，表明震中主要遵循主要地震成因结构的线性特征。在这些主要等高线内，Dc为0.2到0.6的几个紧密等值线的凹坑被确定为震中团簇区域，并被推断为沿前弧沿断层系统的断层相交和凹凸区域。沿着俯冲带还观察到b值（1.2-1.5）的空间变化，并出现了一些较低值（1.2-1.3）的凹坑。较小的b值区域与较低的Dc（0.5-0.9）确证了，这意味着正相关。这些区域被确定为是应力较大或粗糙的区域，在这些区域中发生了中级到强地震的破裂形核。

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