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<p>Jharia Coalfield is one of the oldest and most crucial mining regions. It faces ongoing challenges with land subsidence due to mining operations and coal seam fires. Previous studies often overlooked the combined impact of ascending and descending pass line-of-sight (LOS) time-series displacement characteristics, along with the seasonal impacts and periodicity behaviour. In this paper, a detailed analysis of LOS displacement and periodicity in ascending and descending pass time-series displacement was conducted using PS-InSAR to assess deformation patterns in East Jharia. Multisparse point processing was used to obtain the comprehensive time-series deformation of various persistent scatterers obtained in ascending and descending passes over the study area. This approach increases the number of persistent scatterers and also enhances the distribution over the area with diverse terrain. Ascending and descending passes showed 2.88% subsidence and 2.36% upliftment, and 7.54% subsidence and 11.76% upliftment, respectively. However, the integration of both passes revealed 8.24% subsidence and 10.73% upliftment, highlighting the inability to capture deformation using a single pass in diverse terrain conditions. Further, the Fast Fourier Transformation reveals differences in frequency amplitude distribution between both passes. The maximum amplitude for the ascending pass is 0.4161 at a 51-day cycle, and for the descending pass, it is 0.2676 at a 72-day cycle. It suggests that deformation patterns are influenced by factors such as satellite pass direction, environmental conditions, and geological structures. Deformation assessment of most stable points highlights that though the points seem to be stable during the period, significant seasonal patterns are present, as a maximum of 17.84–20.74 mm of deformation range is observed in ascending and descending passes, respectively, which can affect the overlaying structures. Overall, the study provides valuable insights into the spatial distribution of subsidence for 2023, highlighting the importance of integrated pass PS-InSAR data in assessing and managing ground movement in mining-affected regions.</p>

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Comprehensive analysis of line-of-sight displacement and periodicity in ascending and descending pass time-series ground deformation in the mining-affected East Jharia Coalfield

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Aditya Kumar Thakur,
  • Rahul Dev Garg,
  • Kamal Jain

摘要

Jharia Coalfield is one of the oldest and most crucial mining regions. It faces ongoing challenges with land subsidence due to mining operations and coal seam fires. Previous studies often overlooked the combined impact of ascending and descending pass line-of-sight (LOS) time-series displacement characteristics, along with the seasonal impacts and periodicity behaviour. In this paper, a detailed analysis of LOS displacement and periodicity in ascending and descending pass time-series displacement was conducted using PS-InSAR to assess deformation patterns in East Jharia. Multisparse point processing was used to obtain the comprehensive time-series deformation of various persistent scatterers obtained in ascending and descending passes over the study area. This approach increases the number of persistent scatterers and also enhances the distribution over the area with diverse terrain. Ascending and descending passes showed 2.88% subsidence and 2.36% upliftment, and 7.54% subsidence and 11.76% upliftment, respectively. However, the integration of both passes revealed 8.24% subsidence and 10.73% upliftment, highlighting the inability to capture deformation using a single pass in diverse terrain conditions. Further, the Fast Fourier Transformation reveals differences in frequency amplitude distribution between both passes. The maximum amplitude for the ascending pass is 0.4161 at a 51-day cycle, and for the descending pass, it is 0.2676 at a 72-day cycle. It suggests that deformation patterns are influenced by factors such as satellite pass direction, environmental conditions, and geological structures. Deformation assessment of most stable points highlights that though the points seem to be stable during the period, significant seasonal patterns are present, as a maximum of 17.84–20.74 mm of deformation range is observed in ascending and descending passes, respectively, which can affect the overlaying structures. Overall, the study provides valuable insights into the spatial distribution of subsidence for 2023, highlighting the importance of integrated pass PS-InSAR data in assessing and managing ground movement in mining-affected regions.