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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Remnants of large magnitude earthquakes: Evidences from the Great Rann sediments, Kachchh, Western India
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Remnants of large magnitude earthquakes: Evidences from the Great Rann sediments, Kachchh, Western India

机译：大地震的残留物：来自印度西部卡奇的大兰恩沉积物的证据

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During our investigations on the seismicity of the Kachchh region of Gujarat, we recorded a variety of seismically-induced deformational features from the Great Rann sediments. The structures identified, viz, small-scale folding, pseudo-sand blow, sand dike and micro-faulting from the newly-excavated trenches are attributed to liquefaction and fluidization of water-saturated sediment resulting due to upward propagation of cyclic shear waves, generated during earthquake. Other features identified were craters with no connecting feeder dikes from the bottom. We envisage that these craters might have been formed due to sudden down slip along en-echelon faults developed at the crest and on the limb of an anticlinal structure (? Ludiya anticline), suggestive of reactivation of anticlinal structure caused by the tectonic movement during Holocene period. These structures provide not only more data on the diversity of the deformational features, but also enable to suggest the likely tectonic mechanism responsible for the genesis of these structures, and point to the occurence of seismic events of magnitude M-s greater than or equal to 5 which may have been responsible for the deformation of the Holocene sediments of Rann. [References: 21]
机译：在对古吉拉特邦Kachchh地区的地震活动进行调查的过程中，我们记录了大拉恩沉积物中各种地震诱发的形变特征。从新开挖的沟槽中识别出的结构，即小规模折叠，伪砂吹，堤防和微断层，归因于循环剪切波的向上传播所导致的水饱和沉积物的液化和流化在地震中。识别出的其他特征是火山口，底部没有连接的供料堤。我们设想这些陨石坑可能是由于沿背斜构造（顶角背斜线）的顶部和四肢上形成的梯级断层突然滑落而形成的，这暗示了全新世构造运动引起的背斜构造的重新活化。期。这些结构不仅提供了有关变形特征多样性的更多数据，而且还能够提出可能导致这些结构发生的构造机制，并指出发生了地震级数Ms大于或等于5的事件。可能是造成Rann全新世沉积物变形的原因。 [参考：21]

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