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首页> 外文期刊>Journal of Asian earth sciences >Magnetotelluric studies in the Central India Tectonic Zone: Implications for intraplate stress regimes and generation of shallow earthquakes
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Magnetotelluric studies in the Central India Tectonic Zone: Implications for intraplate stress regimes and generation of shallow earthquakes

机译：印度中部构造带的大地电磁研究：对板内应力状态和浅层地震产生的影响

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The Central India Tectonic Zone (C1TZ) dissects the Indian Peninsula into the northern and southern crus-tal blocks. The CITZ has been a seismically active region since the Precambrian. Whereas the relatively deep crustal earthquakes near the Narmada faults in the eastern part of the CITZ have been well-investigated, the mechanisms for the shallow earthquakes in the western part remain unknown. Here we present results from a new magnetotelluric study to derive the crustal structure and to understand its implications. Our data show a thick and highly resistive (＞500 ohm m) crust in the south of Tapti River, as against a less resistive one in the north. These results in conjunction with heat flow values indicate that the crust below the southern part has stable continental cratonic signatures. On the northern side of the Tapti River, we infer the ascent of basaltic magmas from the mantle into the shallow crust and crystallization into layered intrusions. These mafic-ultramafic bodies could be a potential cause for the shallow earthquakes in the western part of the CITZ. The mafic-ultramafic bodies below the crust of CITZ would locally modify the intraplate stresses, which in turn would facilitate the occurrence of earthquakes due to reactivation of pre-existing faults. Thus, the large accumulation of strain energy in the deep crust beneath the region can be attributed to the presence of high stress bodies emplaced at depth during the Deccan Volcanic activity.
机译：印度中部构造带（C1TZ）将印度半岛分为北部和南部地壳。自前寒武纪以来，CITZ一直是地震活跃地区。尽管已经对CITZ东部Narmada断层附近的相对较深的地壳地震进行了充分的调查，但西部地区的浅层地震的机制仍然未知。在这里，我们介绍了一项新的大地电磁研究的结果，以得出地壳结构并了解其含义。我们的数据显示，塔皮蒂河以南的地壳厚而电阻率高（＞ 500 ohm m），而北部的电阻率低。这些结果与热流值一起表明，南部以下的地壳具有稳定的大陆克拉通特征。在塔皮蒂河的北侧，我们推断出玄武岩浆从地幔到浅地壳的上升，然后结晶成分层的侵入体。这些镁铁质超音波生物体可能是在CITZ西部发生浅层地震的潜在原因。在CITZ地壳以下的镁铁质超拉美体将局部改变板内应力，这反过来又将有利于由于重新存在的断层而引起地震。因此，在该区域下方深层地壳中应变能的大量积累可以归因于在Deccan火山活动期间深处存在高应力体。

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