Magnitude of the sediment transport event due to the Late Pleistocene sector collapse of Asama volcano, central Japan

Yoshida, Hidetsugu; Sugai, Toshihiko

doi:10.1016/j.geomorph.2006.08.006

Cited by 14 publications

(13 citation statements)

References 33 publications

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“…On the other hand, even if some small primary hummocks were formed at the initial stage, they could have been hidden by post-collapse modifications and surficial sediment deposition in this upstream area of the DAD (Yoshida and Sugai, 2007a), as indicated by the presence of convex-up cross profiles at an elevation of 2800-2300 m (Fig. 9, or around the letter B in Fig.…”

Section: Debris Avalanche and Formation Of Hummocksmentioning

confidence: 98%

“…The volume of the missing edifice by the sector collapse is calculated as the sum of the elevation differences between the reconstructed surface and the present landform: 12.75 × 10 8 m 3 by the linear method and 10.67 × 10 8 m 3 by the Bézier method. If we assume the preexisting fluvial dissection of the edifice or a crater on the top (Aramaki, 1963), this reconstructed volume may be reduced by approximately 10 % (Aramaki, 1963;Yonechi et al, 1988;Yoshida and Sugai, 2007a). The estimated source volume of the sector collapse is then given as 9.60-11.48 × 10 8 m 3 .…”

Section: Volume Estimation Of Dad By the Source Area Reconstructionmentioning

confidence: 99%

“…Because of the expansion of the original mass and/or sediment entrainment during transport, the volume of DAD is greater than the source volume by 25-30 % (Siebert, 1984;Yoshida and Sugai, 2007a). Accounting for the estimated source volume of 9.6-11.5 × 10 8 m 3 , the potential volume of the DAD would become 12-15 × 10 8 m 3 .…”

Section: Characteristics Of the Debris Avalanche Inferred From The Vomentioning

confidence: 99%

“…Furthermore, sector collapse can repeatedly occur on the same volcano after regrowing an unstable flank (Tibaldi and Vezzoli, 2004;Zernack et al, 2009). Such recurrence of sector collapse is often expected in single or multiple directions (Lagmay et al, 2000;Yoshida and Sugai, 2007a;Paguican et al, 2012Paguican et al, , 2014. However, since the recurrence interval is not constant and the stationary period can last for more than 10 3 to 10 4 years (Moriya, 1988), the areas around an unstable volcano can be highly urbanized without considering the risk of a sector collapse.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of debris avalanche deposits inferred from source volume estimate and hummock morphology around Mt. Erciyes, central Turkey

Hayakawa

Yoshida

Obanawa³

et al. 2018

Nat. Hazards Earth Syst. Sci.

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Abstract. Debris avalanches caused by volcano sector collapse often form characteristic depositional landforms such as hummocks. Sedimentological and geomorphological analyses of debris avalanche deposits (DADs) are crucial to clarify the size, mechanisms, and emplacement of debris avalanches. We describe the morphology of hummocks on the northeastern flank of Mt. Erciyes in Kayseri, central Turkey, likely formed in the late Pleistocene. Using a remotely piloted aircraft system (RPAS) and the structurefrom-motion and multi-view stereo (SfM-MVS) photogrammetry, we obtained high-definition digital elevation model (DEM) and orthorectified images of the hummocks to investigate their geometric features. We estimated the source volume of the DAD by reconstructing the topography of the volcano edifice using a satellite-based DEM. We examined the topographic cross sections based on the slopes around the scar regarded as remnant topography. Spatial distribution of hummocks is anomalously concentrated at a certain distance from the source, unlike those that follow the distance-size relationship. The high-definition land surface data by RPAS and SfM revealed that many of the hummocks are aligned toward the flow direction of the debris avalanche, suggesting that the extensional regime of the debris avalanche was dominant. However, some displaced hummocks were also found, indicating that the compressional regime of the flow contributed to the formation of hummocks. These indicate that the flow and emplacement of the avalanche were constrained by the topography. The existing caldera wall forced the initial eastward flow to move northward, and the north-side caldera wall forced the flow into the narrow and steepened outlet valley where the sliding debris underwent a compressional regime, and out into the unconfined terrain where the debris was most likely emplaced on an extensional regime. Also, the estimated volume of 12-15 × 10 8 m 3 gives a mean thickness of 60-75 m, which is much deeper than the reported cases of other DADs. This suggests that the debris avalanche must have flowed further downstream and beyond the current DAD extent. Assessments of the DAD incorporating the topographic constraints can provide further insights into the risk and mitigation of potential disasters in the study area.

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Section: Debris Avalanche and Formation Of Hummocksmentioning

confidence: 98%

Section: Volume Estimation Of Dad By the Source Area Reconstructionmentioning

confidence: 99%

Section: Characteristics Of the Debris Avalanche Inferred From The Vomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of debris avalanche deposits inferred from source volume estimate and hummock morphology around Mt. Erciyes, central Turkey

Hayakawa

Yoshida

Obanawa³

et al. 2018

Nat. Hazards Earth Syst. Sci.

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“…Initial landslide volume can be estimated by different methodologies depending on the mathematical description selected, with hydrological, geomorphological or both kind of features taken into account (Gartner et al 2008;Marchi et al 2010;Chang et al 2011;Friedel 2011;Tsai et al 2011;Robinson and Clynne 2012;Rocco et al 2012). Other authors including Yoshida and Sugai (2007) or Santi and Morandi (2013) propose measuring and simplifying the deposit dimensions using common methods such as truck remobilization or field observations (thickness, sediment width, and flow-path length). Geographical information systems (GIS) are also commonly used to estimate sediment volume based on pre-and post-topographical layers where the slide boundary has been identified (e.g.…”

Section: Introductionmentioning

confidence: 99%

Runout and deposit morphology of Bingham fluid as a function of initial volume: implication for debris flow modelling

et al. 2014

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Debris flow modelling has become an important tool for assessing the related hazard so as to undertake appropriate mitigation actions and reduce the associated risk. Volume values are key input data for landslides numerical modelling. This work analyses the influence of the uncertainties related to initial volume and initial mass morphology (using the aspect ratio as a parameter) on the spreading of Bingham fluid. The dependency of this effect on slope changes is also analysed using three interesting landscape configurations: a horizontal plane, a simplified bilinear topography with increasing slope angle, and a real topography (Colima volcano landscape). We use the smoothed particle hydrodynamics (SPH) model to carry out this analysis. The SPH model is a depth-integrated model, which was previously validated by reproducing problems with analytical results (1D break dam). The initial aspect ratio is a primordial control parameter of the spreading in the case of a quasi-horizontal plane or very gentle slope, but this effect dissipates when the slope angle increases and the flow dynamics become essentially controlled by its volume. Even if most hydrodynamic models using different rheological approach can successfully reproduce real events, input data uncertainties and model sensitivity should be taken into account.

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Terminology and Strategy to Describe Large Volcanic Landslides and Debris Avalanches

Bernard

Takarada

Andrade

et al. 2020

Advances in Volcanology

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Magnitude of the sediment transport event due to the Late Pleistocene sector collapse of Asama volcano, central Japan

Cited by 14 publications

References 33 publications

Characteristics of debris avalanche deposits inferred from source volume estimate and hummock morphology around Mt. Erciyes, central Turkey

Characteristics of debris avalanche deposits inferred from source volume estimate and hummock morphology around Mt. Erciyes, central Turkey

Runout and deposit morphology of Bingham fluid as a function of initial volume: implication for debris flow modelling

Terminology and Strategy to Describe Large Volcanic Landslides and Debris Avalanches

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