Seismic anisotropy observations provide a potential tool to constrain the signatures of various continental-scale deformations that have shaped the lithospheric structure of various mobile belts and ancient cratons across the world. They shed light on various aspects of evolutionary tectonics in any region. The current study primarily aims at examining the direct S-wave derived seismic anisotropy beneath the Eastern Ghats Mobile Belt (EGMB) and the adjacent Archean Singhbhum and Bastar Cratons. The granulite Terrane of EGMB represents the complex deformational history and is a crucial link in the reconstruction of Rodinia and Gondwana supercontinents. The Terrane underwent collision and rifting in Mesoproterozoic, followed by thermal overprint of the mid-Neoproterozoic to early Phanerozoic orogeny modifying its lithospheric structure. We have implemented the Reference Station Technique and obtained 854 well-constrained individual splitting measurements. The observations are based on 185 earthquake events (with Mw$⩾$5.5, and epicentral distance ranging 30$°$ to 90$°$) recorded at 27 seismic stations deployed in the study area. The large splitting delay times (1.2–2.3 s) suggest that the lithospheric mantle is highly anisotropic. The NNE-SSW oriented Fast Polarization Directions (FPDs) observed at the Singhbhum Craton can be devoted to the evolutionary tectonic regime of the craton. The strained minerals at the deeper depths, result in FPD patterns sub-parallel to the Kerajung Fault Zone ($~$70$°$) in the Angul Domain. The FPDs are predominantly oriented along the Absolute Plate Motion (APM) direction of the Indian plate ($~$39$°$) for the Bastar Craton. However, the varying FPD patterns in the Eastern Ghats Boundary Shear Zone (Khariar Domain) signify the influence of the lithospheric deformation along with APM. The imprints of the continental building orogenies, that have modified the lithospheric structure of the study area over the Mesoproterozoic, mid-Neoproterozoic, and early Phanerozoic periods, are preserved as frozen anisotropic signatures. Our observations highlight these signatures. The study also investigates seismic anisotropic patterns in the hitherto uncharted regions close to Chilka Lake using the core-mantle refracted (SKS, SKKS, and PKS) and direct S phases. The markedly distinct E-W (average $~$95$°$) oriented fast wave azimuths, against the $~$47$°$ average FPD of the adjacent western Phulbani Domain, distinguishes it as a separate block amongst the collage of domains forming the Eastern Ghats Province.

地震各向异性观测提供了一个潜在的工具，可以约束各种大陆尺度变形的特征，这些变形已经塑造了世界各地各种移动带和古代克拉通的岩石圈结构。他们阐明了任何地区的演化构造学的各个方面。当前的研究主要目的是研究东高止山脉移动带（EGMB）以及邻近的太古宙格邦和Bastar Cratons下方直接S波衍生的地震各向异性。EGMB的花岗石地层代表了复杂的变形历史，是罗丹尼亚和冈瓦纳超大陆重建的关键环节。Terrane在中古生代经历了碰撞和裂谷，随后是中新古生代到早生代造山带的热套印，从而改变了其岩石圈结构。我们已经实施了参考站技术，并获得了854个受约束的个体分裂测量值。观测结果基于185个地震事件（兆瓦级$⩾$5.5，震中距离为30$°$ 至90$°$）记录在研究区域内部署的27个地震台站上。大的分裂延迟时间（1.2–2.3 s）表明岩石圈地幔是高度各向异性的。在辛格哈顿克拉通观测到的NNE-SSW取向的快速极化方向（FPD）可以用于克拉通的演化构造体系。较深深度的应变矿物导致FPD图样与Kerajung断层带平行（$〜$70$°$）在Angul域中。FPD主要沿印度板块的绝对板块运动（APM）方向定向（$〜$39$°$）用于Bastar Craton。然而，东高止山脉边界剪切带（Khariar域）中FPD模式的变化表明岩石圈变形和APM的影响。大陆构造造山带的印记被保存为冻结的各向异性特征，这些印记改变了中元古代，中期新元古代和早古生代时期研究区的岩石圈结构。我们的观察突出了这些签名。该研究还利用岩心幔折射（SKS，SKKS和PKS）和直接S相研究了奇尔卡湖附近迄今未知的地区的地震各向异性模式。明显不同的电子战（平均$〜$95$°$）定向的快速波方位角 $〜$47$°$ 相邻的Phulbani西部地区的平均FPD值将其区分为构成东高止山脉省的各个地区的一个单独区域。