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Landslide characterization using active and passive seismic imaging techniques: a case study from Kerala, India

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  • Francisco J. Chávez-García

    (Universidad Nacional Autónoma de México)

  • Thulasiraman Natarajan

    (Jawaharlal Nehru Centre for Advanced Scientific Research)

  • Martín Cárdenas-Soto

    (Universidad Nacional Autónoma de México, Ciudad Universitaria)

  • Kusala Rajendran

    (Center for Earth Science, Indian Institute of Sciences)

Abstract

The unusually intense precipitations of the 2018 monsoon triggered numerous landslides in the Western Ghats region, southwest of India. Although the landslides caused no casualties, significant damage to property and infrastructure was observed. We present, as a case study, the results of active and passive seismic prospecting at two of those landslides with the goal of characterizing them, in a first application of shallow seismic exploration to landslides in the region. Our deployments included both sites perturbed by the landslides and unperturbed slopes adjacent to them with the purpose of identifying possible structural differences between slopes that underwent landsliding from slopes that were not affected. We analyze seismic sections obtained using the multi-channel analysis of surface waves technique and compare the results with seismic noise analyzed using seismic interferometry. We show that different analyses give similar results. The lateral variations observed in the shear-wave velocity distribution below the different profiles are well correlated with dominant frequency determined from seismic noise horizontal-to-vertical spectral ratios. Our measurements were taken after the landslides occurred. In hindsight, our results suggest that soil thickness played a major role in the triggering of landslides.

Suggested Citation

  • Francisco J. Chávez-García & Thulasiraman Natarajan & Martín Cárdenas-Soto & Kusala Rajendran, 2021. "Landslide characterization using active and passive seismic imaging techniques: a case study from Kerala, India," 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. 105(2), pages 1623-1642, January.
    • Handle: RePEc:spr:nathaz:v:105:y:2021:i:2:d:10.1007_s11069-020-04369-y
    DOI: 10.1007/s11069-020-04369-y
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    1. Yawar Hussain & Martin Cardenas-Soto & Salvatore Martino & Cesar Moreira & Welitom Borges & Omar Hamza & Renato Prado & Rogerio Uagoda & Juan Rodríguez-Rebolledo & Rafael Cerqueira Silva & Hernan Mart, 2019. "Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil," Sustainability, MDPI, vol. 11(23), pages 1-18, November.
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