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Variation patterns of landslide basal friction revealed from long-period seismic waveform inversion

Author

Listed:
  • Dan Yu

    (China Earthquake Networks Center)

  • Xinghui Huang

    (China Earthquake Networks Center)

  • Zhengyuan Li

    (China Earthquake Networks Center)

Abstract

A catastrophic landslide struck the Xiaoba village in Fuquan, Guizhou, southwestern China at about 8:30 p.m. (Beijing Time, UTC + 8) on August 27, 2014. The landslide and induced impulse water waves destroyed two villages and killed 23 persons. By reprocessing seismic signals from a seismic network deployed in the surrounding area of the landslide, we recognized the event from low-frequency seismic signals and subsequently performed a long-period seismic waveform inversion to obtain its force–time history. The inversion results reveal that the maximum force for the landslide is 5 × 109 N, and the duration of the landslide is 38.4 s. The landslide reached its maximum velocity of 12.4 m/s at 13.2 s after its initiation, and the mass center plugged into the quarry at 24.2 s. Based on the inversion results, we estimated basal friction of the landslide. We found the friction coefficient rapidly reduces to a relatively steady-state value of ~ 0.4 at a steady-state distance of 35 m and subsequently reduces in a near-linear manner that satisfies the empirical formula $$ \mu = - 1.4d + 0.44 $$μ=-1.4d+0.44, where $$ d $$d is sliding distance in km. The reduction in friction revealed by the formula is compatible with the finding of previous studies for landslides of similar volume in landslide acceleration stage. However, our result does not make it possible for the friction coefficient to increase again in landslide deceleration stage that a velocity-dependent friction law would allow. The friction variation patterns can be used to constrain input parameters in numerical landslide simulation, which can predicate runout distance and deposit areas for massive landslides to carry out landslide hazard assessment.

Suggested Citation

  • Dan Yu & Xinghui Huang & Zhengyuan Li, 2020. "Variation patterns of landslide basal friction revealed from long-period seismic waveform inversion," 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. 100(1), pages 313-327, January.
    • Handle: RePEc:spr:nathaz:v:100:y:2020:i:1:d:10.1007_s11069-019-03813-y
    DOI: 10.1007/s11069-019-03813-y
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    References listed on IDEAS

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    1. Antoine Lucas & Anne Mangeney & Jean Paul Ampuero, 2014. "Frictional velocity-weakening in landslides on Earth and on other planetary bodies," Nature Communications, Nature, vol. 5(1), pages 1-9, May.
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