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首页> 外文期刊>Geochemistry, geophysics, geosystems >Crustal anisotropy from tectonic tremor in Guerrero, Mexico
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Crustal anisotropy from tectonic tremor in Guerrero, Mexico

机译：墨西哥格雷罗构造地震的晶体各向异性

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摘要

We present new shear wave anisotropy measurements in the continental crust in northern Guerrero obtained from tectonic tremor. Measurements of crustal anisotropy had not been performed in this area due to the lack of seismicity. However, tectonic tremor activity is abundant and offers an opportunity to determine anisotropy parameters. Polarization and splitting analyses were performed using broadband three-component seismograms. Results show that splitting times range between 0.07 and 0.36 s. These values are similar to the splitting magnitudes typically observed in the continental crust. The state of stress in the continental crust was investigated by inverting focal mechanisms determined in this study, and also from previous structural geology studies. Unfortunately, no stress measurements were possible in the area where tectonic tremor occurs. It was determined that, to the south of the study area, near the Pacific coast, and to the north, in the volcanic arc, the maximum compressive stress shows a general E-W trend. The fast polarization directions are oriented NE-SW and are oblique to the observed maximum compressive stress surrounding the study area. Thus, the relationship between the maximum compressive stress and the observed anisotropic pattern cannot be conclusively established. Several factors such as nonlinear strain in the continental crust as a result of Slow Slip Events, variations of pore fluid pressure, deep crustal mineralogy, and/or upper crust foliations and schistosity could be inducing the observed anisotropy pattern. In general, the fast axes tend to parallel the regional Laramide and Tertiary folds-and-thrusts which strike NNE-SSW. This system of folds-and-thrusts is highly foliated in low-grade schist and seems likely to control the anisotropic structure observed within the tectonic tremor region in Guerrero.
机译：我们介绍了从构造震颤获得的北部格雷罗北部大陆壳中的新剪切波各向异性测量结果。由于缺乏地震活动性，未在该地区进行地壳各向异性的测量。但是，构造震颤活动丰富，为确定各向异性参数提供了机会。使用宽带三分量地震图进行了极化和分裂分析。结果表明，分裂时间为0.07至0.36 s。这些值类似于在大陆地壳中通常观察到的分裂幅度。通过逆转本研究确定的震源机制以及先前的构造地质研究，研究了地壳的应力状态。不幸的是，在构造震颤发生的地区无法进行应力测量。已确定，在研究区域的南部，太平洋海岸附近，以及在北部的火山弧中，最大压缩应力表现出普遍的E-W趋势。快速极化方向指向NE-SW，并且与研究区域周围观察到的最大压缩应力倾斜。因此，不能最终确定最大压缩应力与观察到的各向异性模式之间的关系。缓慢滑动事件导致的大陆壳非线性应变，孔隙流体压力的变化，地壳深层矿物学和/或上地壳的叶性和集聚性等多种因素可能导致了观测到的各向异性。通常，快轴趋向于平行于区域NEAR-SSW的Laramide和第三纪褶皱和逆冲。这种褶皱和冲断系统在低品位片岩中高度成叶，似乎很可能控制了格雷罗州构造震颤区内观察到的各向异性结构。

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