Natural Hazards

, Volume 81, Issue 1, pp 123–144 | Cite as

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

  • Atsuko Nonomura
  • Shuichi Hasegawa
  • Ryota Kageura
  • Katsushi Kawato
  • Tatsuro Chiba
  • Satoshi Onoda
  • Ranjan Kumar Dahal
Original Paper
First Online:
Received:
Accepted:

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.

Keywords

Resistivity Loosened zone Deep-seated landslide Earthquake-induced landslide 
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Notes

Acknowledgments

This research was financially supported by the Japanese Ministry of Land, Infrastructure, Transport, and Tourism (ID: 08080243). English writing was supported by Mr. William Vogler, ELSS service, and American Journal experts. Mr. Minoru Okumura gave us technical advice.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Atsuko Nonomura
    • 1
  • Shuichi Hasegawa
    • 1
  • Ryota Kageura
    • 2
  • Katsushi Kawato
    • 2
  • Tatsuro Chiba
    • 3
  • Satoshi Onoda
    • 3
  • Ranjan Kumar Dahal
    • 4
  1. 1.Department of Safety Systems Construction Engineering, Faculty of EngineeringKagawa UniversityTakamatsuJapan
  2. 2.Nippon Engineering ConsultantsTokyoJapan
  3. 3.Asia Air SurveyTokyoJapan
  4. 4.Department of GeologyTribhuvan UniversityKathmanduNepal

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