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首页> 外文期刊>Pure and Applied Geophysics >An Appraisal of the 2001 Bhuj Earthquake (Mw 7.7, India) Source Zone: Fractal Dimension and b Value Mapping of the Aftershock Sequence
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An Appraisal of the 2001 Bhuj Earthquake (Mw 7.7, India) Source Zone: Fractal Dimension and b Value Mapping of the Aftershock Sequence

机译：2001年普吉地震（印度瓦特7.7）震源区评估：余震序列的分形维数和b值映射

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摘要

We examined seismic characteristics, b value and fractal dimension of the aftershock sequence of the January 26, 2001 Bhuj earthquake (Mw 7. 7) that occurred in the Kutch failed rift basin, western margin of the Stable Continental Region (SCR) of India. A total of about 2,000 events (M ≥ 2. 0) were recorded within two and a half months, immediately after the main shock. Some 795 events were precisely relocated by simultaneous inversion. These relocated events are used for mapping the frequency-magnitude relation (b value) and fractal correlation dimension (Dc) to understand the seismic characteristics of the aftershocks and the source zone of the main shock. The surface maps of the b value and Dc reveal two distinct tectonic arms or zones of the V-shaped aftershock area, western zone and eastern zone. The b value is relatively higher (~1. 6) in the western zone compared to a lower value (~1. 4) in the eastern zone. The Dc map also shows a higher value (1. 2-1. 35) in the western zone compared to a lower Dc (0. 80-1. 15) in the eastern zone; this implies a positive correlation between Dc and b value. Two cross sections, E-W and N-S, are examined. The E-W sections show similar characteristics, higher b value and higher Dc in the western zone and lower in the eastern zone with depth. The N-S sections across the fault zones, however, show unique features; it imaged both the b and Dc characteristics convincingly to identify two known faults, the Kutch Mainland fault and the South Wagad fault (SWF), one stepping over the other with a seismogenic source zone at depth (20-35 km). The source zone at depth is imaged with a relatively lower b and higher Dc at the 'fault end' of the SWF showing a negative correlation. These observations, corroborated with the seismic tomography as well as with the proposed geological/tectonic model, shed a new light to our understanding on seismogenesis of the largest SCR earthquake in India in the recent years.
机译：我们研究了2001年1月26日发生在印度稳定大陆地区（SCR）西缘库奇失败的裂谷盆地的普杰地震（Mw 7、7）的余震序列的地震特征，b值和分形维数。在主震发生后的两个半月内，总共记录了约2,000个事件（M≥2。0）。通过同时反演，精确定位了795个事件。这些重新定位的事件用于映射频率-幅度关系（b值）和分形相关维数（Dc），以了解余震的地震特征和主震源区。 b值和Dc的表面图显示了V形余震区的两个明显的构造臂或区域，即西部区域和东部区域。 b值在西部地区相对较高（〜1.6），而在东部地区则较低（〜1.4）。与东部地区的Dc较低（0. 80-1。15）相比，西部地区的Dc映射还显示了较高的值（1.2.1.3）。这意味着Dc和b值之间呈正相关。检查了两个横截面，即E-W和N-S。 E-W断面具有相似的特征，西部的b值较高，Dc较高，东部的深度较低。但是，跨断层带的N-S部分显示出独特的特征。它令人信服地成像了b和Dc特征，以识别出两个已知的断层，即库奇大陆断层和南瓦加德断层（SWF），一个越过另一个断层，其深度为20-35 km。在SWF的“故障端”，以相对较低的b和较高的Dc对深处的源区成像，显示负相关。这些观察结果与地震层析成像以及拟议的地质/构造模型相吻合，为我们对近年来印度最大的SCR地震的成因提供了新的认识。

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