This research elucidates the findings related to crustal deformation following the devastating 2001 Bhuj earthquake (M7.7), located within the Kachchh paleo-rift system in the western part of the Indian plate. The seismological data underscore the importance of a deeper understanding of the deformation patterns in this region. In response, the Institute of Seismological Research (ISR) established a dense geodetic GNSS network in this segment of the Indian plate. The geodetic results presented in this study are based on over a decade of continuous GNSS measurements in this intra-plate area. The results indicate that the central portion of the Kachchh rift continues to experience the highest levels of strain, particularly near the epicentral region of the 2001 earthquake. The geodetic data reveal both dip-slip and strike-slip fault movements, corroborated by the occurrence of earthquakes of both types. Regional stress is found to be more pronounced along the faults (IBF, ABF, KHF, KMF), while local stress significantly influences the SWF and GF. The study concludes that dip-slip earthquakes in Kachchh are primarily driven by regional stress, whereas strike-slip earthquakes are influenced by local stress conditions. The interplay of both local and regional stress conditions create Kachchh one of the most active regions within the intra-plate domain. The findings highlight the critical need for continued monitoring of seismogenic faults to improve the understanding of high strain areas within intra-plate regions.

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Crustal Deformation After Two Decades of Deadly 2001 Bhuj Earthquake

  • Rakesh K. Dumka,
  • D. Suribabu,
  • Sumer Chopra,
  • Sandip Prajapati

摘要

This research elucidates the findings related to crustal deformation following the devastating 2001 Bhuj earthquake (M7.7), located within the Kachchh paleo-rift system in the western part of the Indian plate. The seismological data underscore the importance of a deeper understanding of the deformation patterns in this region. In response, the Institute of Seismological Research (ISR) established a dense geodetic GNSS network in this segment of the Indian plate. The geodetic results presented in this study are based on over a decade of continuous GNSS measurements in this intra-plate area. The results indicate that the central portion of the Kachchh rift continues to experience the highest levels of strain, particularly near the epicentral region of the 2001 earthquake. The geodetic data reveal both dip-slip and strike-slip fault movements, corroborated by the occurrence of earthquakes of both types. Regional stress is found to be more pronounced along the faults (IBF, ABF, KHF, KMF), while local stress significantly influences the SWF and GF. The study concludes that dip-slip earthquakes in Kachchh are primarily driven by regional stress, whereas strike-slip earthquakes are influenced by local stress conditions. The interplay of both local and regional stress conditions create Kachchh one of the most active regions within the intra-plate domain. The findings highlight the critical need for continued monitoring of seismogenic faults to improve the understanding of high strain areas within intra-plate regions.