On the Link Between External Forcings and Slope Instabilities in the Piton de la Fournaise Summit Crater, Reunion Island

Durand, Virginie; Mangeney, Anne; Haas, Florian; Jia, Xiaoping; Bonilla, Luis Fabián; Peltier, Aline; Hibert, Clément; Ferrazzini, Valérie; Kowalski, Philippe; Lauret, Fréderic; Brunet, Christophe; Satriano, Claudio; Wegner, Kerstin; Delorme, Arthur; Villeneuve, Nicolas

doi:10.1029/2017jf004507

Cited by 31 publications

(36 citation statements)

References 83 publications

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“…The result of this study not only confirm previous observations relating to the combined effect of rainfall and earthquakes on either slow-moving landslides 60 , rapid landslides 17 activity 61 , but also provided quantitative data based on the dv/v which support the previous hypothesis that soil damage causes this combined effect 17 . Soil damage, interpreted as the creation of micro-/macrofractures as a result of earthquake shaking, generates preferential paths for water infiltration and thus impacts landslide motion after an earthquake until the soil has completely healed.…”

Section: Discussionsupporting

confidence: 89%

Rain and small earthquakes maintain a slow-moving landslide in a persistent critical state

et al. 2020

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In tectonically active mountain belts, landslides contribute significantly to erosion. Statistical analysis of regional inventories of earthquake-triggered-landslides after large earthquakes (Mw > 5.5) reveal a complex interaction between seismic shaking, landslide material, and rainfall. However, the contributions of each component have never been quantified due to a lack of in-situ data for active landslides. We exploited a 3-year geodetic and seismic dataset for a slow-moving landslide in Peru affected by local earthquakes and seasonal rainfalls. Here we show that in combination, they cause greater landslide motion than either force alone. We also show the rigidity of the landslide's bulk clearly decreasing during Ml ≥ 5 earthquakes. The recovery is affected by rainfall and small earthquakes (Ml < 3.6), which prevent the soil from healing, highlighting the importance of the timing between forcings. These new quantitative insights into the mechanics of landslides open new perspectives for the study of the mass balance of earthquakes.

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Section: Discussionsupporting

confidence: 89%

Rain and small earthquakes maintain a slow-moving landslide in a persistent critical state

et al. 2020

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“…Over the last two decades, seismic signals generated by granular flows (e.g., landslides, debris flows, and rockfalls) have been investigated increasingly as a useful complementary tool to sparse visual observations, in order to detect flows and deduce informations about their localization and dynamics (e.g., Arattano, 2000;Brodsky et al, 2003;Dammeier et al, 2011;Durand et al, 2018;Huang et al, 2007;Hibert, Ekström, et al, 2017;Hibert, Mangeney, et al, 2017;Kean et al, 2015;Lai et al, 2018;Schöpa et al, 2018;Suriñach et al, 2005;Pérez-Guillén et al, 2016;Yamada et al, 2016;Zhao et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Relations Between the Characteristics of Granular Column Collapses and Resultant High‐Frequency Seismic Signals

et al. 2019

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Deducing relations between the dynamic characteristics of landslides and rockfalls and the resultant high‐frequency (>1 Hz) seismic signal is challenging. To investigate relations that can be tested in the field, we conducted laboratory experiments of 3‐D granular column collapse on a rough inclined thin plate, for a large set of column masses, aspect ratios, particle diameters, and slope angles. The dynamics of the granular flows were recorded using a high‐speed camera, and the generated seismic signal was measured using piezoelectric accelerometers. Empirical scaling laws are established between the characteristics of the granular flows and deposits and that of the generated seismic signals. The radiated seismic energy scales with particle diameter as d3, column mass as M and aspect ratio as a1.1. The increase of the radiated seismic energy as slope angle increases correlates with a similar increase in particle agitation. Based on our experimental results, we revisit scaling laws reported in the field and discuss their possible physical origin. The discrepancy between field and experimental observations can be explained by the complex influence of the substrate on seismic signal and the difference of flow initiation in both cases. However, our empirical scaling laws allow us to determine which flow parameters could be inferred from a given seismic characteristic in the field. In particular, by assuming the flow average speed is known, we show that we can retrieve parameters d, M, and a within a factor of two from the seismic signal.

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“…Unique strategies for landslide detection, quantification, and monitoring can be designed from seismic data analysis (Chao et al 2017), making it possible to investigate the link between landslide activity and meteorological, climatic, seismic, or volcanic activity. As an example, based on these seismic approaches, Durand et al (2018) showed the stability Seismology and Environment, Fig. 2 (a) The Super Typhoon Ioke in the Pacific ocean from 22 August to 7 September 2006 has been tracked by the National Hurricane Center(blue line), tracks Ioke-generated P wave sources (red) using the Southern California Seismic Network (SCSN).…”

Section: Landslidesmentioning

confidence: 99%

Seismology and Environment

Montagner¹,

Mangeney²,

Stutzmann³

2020

Encyclopedia of Solid Earth Geophysics

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Field using seismic waves for investigating phenomena at the interface of solid and fluid Earth. Anthropic Seismology Field using seismic waves for investigating phenomena induced by anthropogenic activity (nuclear explosions, triggered seismic events in industry, mines, oil reservoirs, quarries, traffic,.. .). Glacial Earthquakes Earthquakes occurring in glaciers or ice polar caps, often associated with calving of icebergs at glacier terminus or at the discontinuity between bedrock and glaciers (specific class of icequakes with large magnitude). Hurricanes, typhoon Violent wind with a circular movement originating in tropical zones. Landslides Destabilization of rocks or soils from a sloping area such as a mountain, a cliff, or a volcano. Microseisms Small earth tremor whose sources are related to the ocean-wave activity. Primary microseisms are oscillating at the characteristic ocean-wave periods (approximately between 10 and 20 s periods) and result from the interaction of these waves with the shallow sea floor. Secondary microseisms are generated by interactions among ocean waves and have the double of their frequency. Seismic hum Continuous excitation of the Earth in the absence of earthquakes (at periods longer than 50 s) created by the interaction of long period ocean waves (infragravity waves) and the sea floor. This signal is weak but nevertheless large enough to excite the earth-free oscillations. Snow avalanches Destabilization of a mass of snow from a sloping topography turning into a flow of snow particles or aggregates that stop downslope. Very long period noise For periods larger than 200 s, the noise results from gravitational attraction changes induced by local pressure perturbations.

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On the Link Between External Forcings and Slope Instabilities in the Piton de la Fournaise Summit Crater, Reunion Island

Cited by 31 publications

References 83 publications

Rain and small earthquakes maintain a slow-moving landslide in a persistent critical state

Rain and small earthquakes maintain a slow-moving landslide in a persistent critical state

Relations Between the Characteristics of Granular Column Collapses and Resultant High‐Frequency Seismic Signals

Seismology and Environment

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