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A method for regionally mapping gravitationally deformed and loosened slopes using helicopter-borne electromagnetic resistivity data

Author

Listed:
  • Atsuko Nonomura

    (Kagawa University)

  • Shuichi Hasegawa

    (Kagawa University)

  • Ryota Kageura

    (Nippon Engineering Consultants)

  • Katsushi Kawato

    (Nippon Engineering Consultants)

  • Tatsuro Chiba

    (Asia Air Survey)

  • Satoshi Onoda

    (Asia Air Survey)

  • Ranjan Kumar Dahal

    (Tribhuvan University)

Abstract

Earthquake-induced deep-seated landslides are prone to occur at gravitationally deformed and loosened slopes. These slopes need to be identified for landslide susceptibility mapping and landslide risk assessment. Surface morphology is an effective factor for finding the slopes, but is not effective for estimating the degree and the area of loosening. Subsurface geophysical investigations are quite useful for determining subsurface geological structures in regions where loosening has occurred. In this study, a method was developed for regionally mapping gravitationally deformed and loosened slopes as earthquake-induced deep-seated landslide susceptible zones by differentiating from sound bedrocks in flexural toppled slopes. Using the helicopter-borne electromagnetic resistivity data, “average ruggedness of resistivity” was proposed as an index parameter for differentiating the loosened zones. The estimated loosened zones were compared with observed geomorphological features during field survey, and it is shown that “average ruggedness of resistivity” is a useful parameter for regional mapping of earthquake-induced deep-seated landslide susceptible slopes.

Suggested Citation

  • Atsuko Nonomura & Shuichi Hasegawa & Ryota Kageura & Katsushi Kawato & Tatsuro Chiba & Satoshi Onoda & Ranjan Kumar Dahal, 2016. "A method for regionally mapping gravitationally deformed and loosened slopes using helicopter-borne electromagnetic resistivity data," 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. 81(1), pages 123-144, March.
    • Handle: RePEc:spr:nathaz:v:81:y:2016:i:1:d:10.1007_s11069-015-2068-0
    DOI: 10.1007/s11069-015-2068-0
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    References listed on IDEAS

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    1. Leeladhar V, 2007. "Customer Centricity and the Reserve Bank," Working Papers id:1265, eSocialSciences.
    2. Runqiu Huang & Jianjun Zhao & Nengpan Ju & Guo Li & Min Lee & Yanrong Li, 2013. "Analysis of an anti-dip landslide triggered by the 2008 Wenchuan earthquake in China," 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. 68(2), pages 1021-1039, September.
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