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Improving urban seismic risk estimates for Bishkek, Kyrgyzstan, through incorporating recently gained geological knowledge of hazards

Author

Listed:
  • Ruth M. J. Amey

    (University of Leeds)

  • John R. Elliott

    (University of Leeds)

  • C. Scott Watson

    (University of Leeds)

  • Richard Walker

    (University of Oxford)

  • Marco Pagani

    (GEM Foundation
    Nanyang Technological University)

  • Vitor Silva

    (GEM Foundation)

  • Ekbal Hussain

    (British Geological Survey, Natural Environment Research Council, Environmental Science Centre)

  • Kanatbek E. Abdrakhmatov

    (Institute of Seismology, National Academy of Sciences)

  • Sultan Baikulov

    (Institute of Seismology, National Academy of Sciences)

  • Gulkaiyr Tilek Kyzy

    (Institute of Seismology, National Academy of Sciences)

Abstract

Many cities are built on or near active faults, which pose seismic hazard and risk to the urban population. This risk is exacerbated by city expansion, which may obscure signs of active faulting. Here, we estimate the risk to Bishkek city, Kyrgyzstan, due to realistic earthquake scenarios based on historic earthquakes in the region and an improved knowledge of the active fault sources. We use previous literature and fault mapping, combined with new high-resolution digital elevation models to identify and characterise faults that pose a risk to Bishkek. We then estimate the hazard (ground shaking), damage to residential buildings and distribution of losses (economical cost and fatalities) using the Global Earthquake Model OpenQuake engine. We model historical events and hypothetical events on a variety of faults that could plausibly host significant earthquakes. This includes proximal, recognised, faults as well as a fault under folding in the north of the city that we identify using satellite DEMs. We find that potential earthquakes on faults nearest to Bishkek—Issyk Ata, Shamsi Tunduk, Chonkurchak and the northern fault—would cause the most damage to the city. An Mw 7.5 earthquake on the Issyk Ata fault could potentially cause 7900 ± 2600 completely damaged buildings, a further 16,400 ± 2000 damaged buildings and 2400 ± 1500 fatalities. It is vital to properly identify, characterise and model active faults near cities to reduce uncertainty as modelling the northern fault as a Mw 6.5 instead of Mw 6.0 would result in 37% more completely damaged buildings and 48% more fatalities.

Suggested Citation

  • Ruth M. J. Amey & John R. Elliott & C. Scott Watson & Richard Walker & Marco Pagani & Vitor Silva & Ekbal Hussain & Kanatbek E. Abdrakhmatov & Sultan Baikulov & Gulkaiyr Tilek Kyzy, 2023. "Improving urban seismic risk estimates for Bishkek, Kyrgyzstan, through incorporating recently gained geological knowledge of hazards," 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. 116(1), pages 365-399, March.
  • Handle: RePEc:spr:nathaz:v:116:y:2023:i:1:d:10.1007_s11069-022-05678-0
    DOI: 10.1007/s11069-022-05678-0
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    References listed on IDEAS

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    1. Vitor Silva & Helen Crowley & Marco Pagani & Damiano Monelli & Rui Pinho, 2014. "Development of the OpenQuake engine, the Global Earthquake Model’s open-source software for seismic risk assessment," 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. 72(3), pages 1409-1427, July.
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