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A broadband seismological observatory at Larsemann Hills, Antarctica: Noise characteristics and data quality
Polar Science ( IF 1.8 ) Pub Date : 2023-07-16 , DOI: 10.1016/j.polar.2023.100970
B. Padma Rao , Krishna Jha , T. Suresh Kumar

Antarctica, the southernmost ice-covered continent, plays a pivotal role in unraveling Earth's intricate evolutionary processes. Several studies have been conducted to comprehend the crustal structure of West Antarctica. However, our understanding of the sub-surface structure in the East Antarctica region, particularly along Princess Elizabeth Land (PEL), remains limited due to the scarcity of geophysical data. To bridge this knowledge gap, we (NCESS) established a permanent broadband seismological observatory in the captivating region of Larsemann Hills, East Antarctica. In addition, we investigate the noise characteristics at the station, employing power spectral density (PSD) measurements. Results have been promising, indicating that the noise levels are within the range of New High Noise Model and New Low Noise Model. Monthly variations in PSD reveal different noise levels throughout the year, with winter months exhibiting lower levels of microseismic noise attributed to lower temperatures and frozen sea surfaces. The long-period noise is higher in April & May, possibly due to high-speed winds and lower in September & October. The outcomes serve as a testament to the success of our installation and ensure a valuable data set. The data will contribute to a comprehensive investigation of sub-surface structures in the PEL region of East Antarctica, enhancing our understanding of geological processes and tectonic evolution. Furthermore, the findings will serve as a valuable resource for future research and contribute to our knowledge of Earth's dynamic processes.



中文翻译:

南极洲拉瑟曼山的宽带地震观测站:噪声特征和数据质量

南极洲是最南端冰雪覆盖的大陆,在揭示地球复杂的进化过程中发挥着关键作用。为了了解西南极洲的地壳结构,已经进行了几项研究。然而,由于地球物理数据的缺乏,我们对东南极洲地区,特别是伊丽莎白公主地(PEL)沿线的地下结构的了解仍然有限。为了弥补这一知识差距,我们(NCESS)在南极洲东部拉尔斯曼山迷人的地区建立了一个永久性宽带地震观测站。此外,我们还采用功率谱密度 (PSD) 测量来研究该站的噪声特性。结果令人鼓舞,表明噪声水平在新高噪声模型和新低噪声模型的范围内。PSD 的每月变化揭示了全年不同的噪声水平,冬季月份由于较低的温度和冰冻的海面而表现出较低的微震噪声水平。长周期噪音在四月和五月较高,可能是由于高速风,而在九月和十月较低。结果证明了我们安装的成功并确保了有价值的数据集。这些数据将有助于对东南极洲 PEL 地区地下结构的全面调查,增强我们对地质过程和构造演化的理解。此外,这些发现将作为未来研究的宝贵资源,并有助于我们了解地球动态过程。

更新日期:2023-07-16
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