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Focal Mechanism Solutions And Seismic Implications For The Eastern Makran: A 30-Year Perspective

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  • Muhammad Imran Hafeez Abbasi

    (COMSATS University Abbottabad Campus.)

Abstract

The Makran Subduction Zone, straddling the nothern Arabian Sea along the borders of Pakistan and Iran, represents one of the most seismically complex regions on Earth, where the Arabian, Eurasian, and Indian plates converge. This study delves into the seismic intricacies of Eastern Makran, an area delineated by a labyrinth of tectonic demarcations including the Zendan, Jiroft, and Ornach-Nal faults, to uncover the underpinnings of its seismicity through an analysis of focal mechanism solutions (FMS) for earthquakes occurring between 1990 and 2019. Utilizing the Kikuchi and Kanamori method for modeling teleseismic P-waves and their surface reflections, this research filters through the data, discarding those compromised by noise, to present a clear picture of seismic activity ranging in magnitude from 4.0 to 7.8 Mw. Contrary to the expected prevalence of major earthquakes, findings reveal a rarity of such events in Eastern Makran, suggesting a nuanced interaction between the Indian and Eurasian plates marked by anticlockwise rotation. This rotation potentially fosters the isolation of microplates, hinting at a dynamic interplay of tectonic forces. Our comprehensive 30-year perspective provides new insights into the focal depths and fault plane solutions, contributing to a better understanding of the seismic behavior and tectonic mechanisms governing the Eastern Makran Subduction Zone.

Suggested Citation

  • Muhammad Imran Hafeez Abbasi, 2023. "Focal Mechanism Solutions And Seismic Implications For The Eastern Makran: A 30-Year Perspective," Malaysian Journal of Geosciences (MJG), Zibeline International Publishing, vol. 8(2), pages 131-137, January.
    • Handle: RePEc:zib:zbnmjg:v:8:y:2023:i:2:p:131-137
    DOI: 10.26480/mjg.01.2024.131.137
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    References listed on IDEAS

    as
    1. C. Rajendran & Kusala Rajendran & Majid Shah-hosseini & Abdolmajid Beni & C. Nautiyal & Ronia Andrews, 2013. "The hazard potential of the western segment of the Makran subduction zone, northern Arabian Sea," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 65(1), pages 219-239, January.
    2. Mohammad Mokhtari & Iraj Abdollahie Fard & Khaled Hessami, 2008. "Structural elements of the Makran region, Oman sea and their potential relevance to tsunamigenisis," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 47(2), pages 185-199, November.
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