Abstract
On 16 August 2018, a Mw 5.1 earthquake occurred in the Molise region (Central Italy) during an intense rainfall event which cumulated up to 140 mm in 3 days. Within 5 days after the seismic event, 88 landslides were surveyed and classified in disrupted and coherent as well as in first-time failures and reactivation. As it resulted by the inventorying, most of the surveyed ground effects were represented by coherent landslides involving clays, marly clays, and cover deposits on low dipping slopes. A spatial distribution analysis of landslides in relation to seismic action and rainfall intensity was carried out to evaluate the possible contribution of both the rainfall-induced saturation and the earthquake shaking to landslide triggering. Based on this analysis, in the epicentral area, it is not possible to clearly split the role of seismic and hydraulic destabilising actions, while, at greater distances, the joined contribution of rainfall and earthquake shaking could have promoted slope failures. Comparisons among collected data and existing worldwide catalogues allow to highlight, through the analysis of the spatial distribution of the surveyed landslides, the possible and not negligible effect of soil saturation during the seismic shaking both in epicentral distance vs. magnitude distribution and in number and spatial concentration of triggered ground effects.
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Acknowledgements
The authors acknowledge P.F. De Pari and the company Geoservizi S.r.l. for the logistic support provided during the field activities. The scientific responsible also thanks the Regione Molise Civil Protection Agency and A. Cardillo and S. Di Pilla for providing the rainfall data.
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The Research Centre for Geological Risks (CERI) of the University of Rome “Sapienza” funded the field surveys and activities.
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In the present study, S. Martino was the scientific responsible of the research group. F. Bozzano and C. Esposito coordinated specific research activities and contributed to pre-processing. B. Antonielli, P. Caprari, M.E. Discenza, M. Fiorucci, and R. Iannucci performed field surveys and data acquisition. L. Schilirò completed the statistical analysis of historical rainfall data and analysed the rainfall event. M. Fiorucci and G.M. Marmoni performed the geospatial and statistical analyses and contributed to the geo-database management and post-processing. All authors contributed to the interpretation of results and to the manuscript writing.
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Martino, S., Antonielli, B., Bozzano, F. et al. Landslides triggered after the 16 August 2018 Mw 5.1 Molise earthquake (Italy) by a combination of intense rainfalls and seismic shaking. Landslides 17, 1177–1190 (2020). https://doi.org/10.1007/s10346-020-01359-w
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DOI: https://doi.org/10.1007/s10346-020-01359-w