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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >The Sanfandila earthquake sequence of 1998, Queretaro, Mexico: activation of an undocumented fault in the northern edge of central Trans-Mexican Volcanic Belt
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The Sanfandila earthquake sequence of 1998, Queretaro, Mexico: activation of an undocumented fault in the northern edge of central Trans-Mexican Volcanic Belt

机译：墨西哥克雷塔罗1998年Sanfandila地震序列：横跨墨西哥中部火山带北缘的一个未记录的断层激活

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摘要

A sequence of small earthquakes occurred in Central Mexico, at the northern edge of the Trans-Mexican Volcanic Belt (TMVB) in the State of Queretaro, during the first 3 months of 1998. Medium to large events in the continental regime of central Mexico are not common, but the seismic history of the region demonstrates that faults there are capable of generating destructive events. The sequence was analyzed using data from a temporary network with the goals of identifying the causative fault and its relation to regional tectonics. Employing a waveform inversion scheme adapted from a method used for regional studies, we found that the source mechanisms conform to the style of faulting (i.e. extension in the E-W direction) representative of the Taxco-San Miguel Allende Fault system. This system has been proposed as the southernmost extension of the Basin and Range (BR) Province. The spatial distribution of hypocenters and source mechanisms indicate that the seismogenic segment was a fault with an azimuth of approximately 334degrees with almost pure dip slip. Since events which occurred just south from this region show features which are consistent with TMVB tectonics (i.e. extension in an N-S direction), the sequence may mark the boundary between the TMVB and BR stress domains. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 34]
机译：1998年的前三个月，墨西哥中部发生了一系列小地震，该地震位于克雷塔罗州的跨墨西哥火山带（TMVB）的北部边缘。墨西哥中部大陆政权的中至大地震是虽然并不常见，但是该地区的地震历史表明，那里的断层能够产生破坏性事件。使用来自临时网络的数据对序列进行了分析，目的是确定造成性断裂及其与区域构造的关系。通过采用一种适用于区域研究的方法的波形反演方案，我们发现源机制符合Taxco-San Miguel Allende故障系统代表的断层样式（即沿E-W方向扩展）。该系统已被提议为盆地与山脉（BR）省的最南端扩展。震源和震源机制的空间分布表明，地震成因段是断层，方位角约为334度，倾角几乎是纯滑动。由于从该区域向南发生的事件显示出与TMVB构造相一致的特征（即沿N-S方向延伸），因此该序列可能会标记TMVB和BR应力域之间的边界。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：34]

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