Geologic hazards and relative slope stability of the inactive part of the Slumgullion Landslide, southwestern Colorado

Parise, Mario; Moscariello, Andrea

doi:10.3133/ofr97706

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The lobes usually show a well-defined fabric (Parise & Moscariello, 1997;Blair & McPherson, 1998;Major, 1998). Elongated clasts, show their long (a) axis preferentially orientated parallel to the lobe margin, being parallel to the fan slope at the lobe side, and having a transverse orientation at the lobe snout.…”

Section: Sedimentary Faciesmentioning

confidence: 99%

Alluvial Fans in the Italian Alps: Sedimentary Facies and Processes

Moscariello

Marchi

Maraga

et al. 2002

Flood and Megaflood Processes and Deposits

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Sediment gravity flows are very common sedimentary processes in the Alpine region and are often characterized by rapid deposition of large amounts of material. Hazard evaluation in such mountainous areas depends on proper identification of the dominant sedimentary processes, interpreted both from modern and ancient sedimentary facies and their distribution. Three main groups of alluvial fans, characterized by different dominant sedimentary processes, have been distinguished on the basis of lithological characteristics of the catchment area. The dominant catchment lithologies are: 1 massive and/or crudely stratified carbonate rocks (dolomite and massive limestones); 2 fine-grained sedimentary and metamorphic rocks (schists, calc-schists, mica schists, slate, phyllites and quartzites); 3 massive crystalline rocks (granites, granodiorites). Their main characteristics are illustrated by three case studies concerning large debris-flow events that occurred in the recent past. The comparison of sediment texture and grain-size distribution indicates that important differences in the sedimentological features of debris flows are generated by the three different rock types in the catchments. Colluvium lithology strongly controls the grain-size distribution of the debris available on the catchment that is mobilized, transported and accumulated on the fan during catastrophic flood events. The proportion of fine-grained particles (clay and fine silt) within the colluvium plays a key role in controlling the dominant primary sedimentary processes. The study of 23 flood events over the past 30 yr indicates that the catchments of group 1 and 2 fans produce large amounts of clay and fine silt, which typically can lead to the generation of cohesive sediment gravity flows. Group 3 fan catchments produce colluvium free of clay and fine silt that can be mobilized and transported by water flow processes, and which in extreme flood events usually are associated with non-cohesive sediment gravity flows.

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Section: Sedimentary Faciesmentioning

confidence: 99%

Alluvial Fans in the Italian Alps: Sedimentary Facies and Processes

Moscariello

Marchi

Maraga

et al. 2002

Flood and Megaflood Processes and Deposits

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“…The boulders are generally arranged with their longest axis at right angles with respect to the trend of the ridge. Field observations at the contact between the rock-fall deposits at the upper portion of the Slumgullion landslide (Parise and Moscariello, 1997) and the active leftlateral ridge suggest that the large boulders present on top of narrow ridges could be interpreted as the remnants of a wider cover made up by large blocks that was reworked and dismembered by the building up of the flank ridges ( fig. 7).…”

Section: Discussionmentioning

confidence: 99%

“…Secondary slope movements, mostly rotational slides, falls and flows, were observed on the sides of several flank ridges at the Slumgullion landslide. Slope movements are present, for example, on the main left flank ridge downslope from the active toe; downcutting by Slumgullion Creek on one side, and by a perennial stream on the other causes frequent slope movements (Parise and Moscariello, 1997).…”

Section: The Flank Ridges At the Slumgullion Landslidementioning

confidence: 99%

Evidence from flank ridges for long-term diminishing movements of the Slumgullion landslide, Hinsdale County, Colorado

Parise¹,

Moscariello²,

Fleming³

1997

Open-File Report

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The Slumgullion landslide, in southwestern Colorado, is a complex phenomenon consisting of an active landslide currently moving on the upper-middle part of an older, larger, and inactive landslide. It is bounded for most of its length by flank ridges that are linear ridges of landslide material that have formed during movement along the lateral boundaries of the landslide. Flank ridges formed by deformation of landslide material, as well as formed by deposition of landslide material onto the adjacent ground surface, were recognized on the inactive Slumgullion landslide. Flank ridges are the best preserved features in the deposits of the inactive Slumgullion landslide. They extend continuously for several hundred meters, following the landslide boundaries. The several generations of flank ridges were mapped on aerial photographs and later field checked; observation of their main geomorphic, pedologic, and sedimentologic characters helped in reconstructing the chronology of their formation. An attempt was also made to correlate the identified sets of flank ridges with the known history of movement of the Slumgullion landslide. Maps and profiles were used to estimate previous width and thickness of the landslide at the time of formation of the identified sets of flank ridges. Comparison of these values with the present width and thickness of the Slumgullion landslide showed a thinning and narrowing trend, which will eventually result in inactivity of the presently active part of the landslide, unless a new amount of material is available from the source area.

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“…Complex networks have been perfected to control the development of landslides such as Ancona, Montaguto, Mt.de La Saxe, Rotolon, and Ruinon [3][4][5][6]. In other countries, similar methods have been applied to monitor landslide complexes such as Randa (Switzerland) [7], La Vallette (France), Super Sauze (France) [8,9], Sado Island (Japan) [10], and Slumgullion (USA) [11]. However, based on the parameters representing the process, three types of warning systems landslides can be divided: (1) Direct warning based on the direct measurement of the displacement of the sliding mass, (2) Early warning based on "thresholds" for landslides : pore water pressure, humidity and precipitation, (3) Combination of the two above systems.…”

Section: Introductionmentioning

confidence: 99%

Simulate landslide activities during flood season 2020 - 2021 in Phong Nha - Ke Bang National Park

Do,

La,

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Research highlights in study area, there are various small-scale landslide points occurred and located surround from major landslide point with already 42 field-investigated points. The core zone of study area has the gravity displacement coefficient (Kg) by 0.0006, the buffer zone has Kg by 0.0033, all of them are weak and relative stable. The core zone of the National Park has more than 60 landslide points with total area of 81.19 hectares, and total landslide soil volume is over 2.6 mil m3. The largest landslide volume in study area is about 2.4 mil m3, with added 14 large-scale lanslide volume from 1,000 to 65,000 m3. In particular, a number of slopes occurred consecutively during flood seasons in years of 2020 - 2021. Landslide activities strongly affecting the integrity and aesthetic value of Phong Nha – Ke Bang (PNKB) National Park with calculation results, for the largest landside point during rainny season in October, 2020, show that the sliding soil blocks have displaced more than 130 m, with low factor of safety (FS) by 0.32 and the total sliding soil volume is 2.1 million m3, also consistent with field monitoring data and analysis of remote sensing images (2.4 mil m3).

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Geologic hazards and relative slope stability of the inactive part of the Slumgullion Landslide, southwestern Colorado

Cited by 3 publications

References 10 publications

Alluvial Fans in the Italian Alps: Sedimentary Facies and Processes

Alluvial Fans in the Italian Alps: Sedimentary Facies and Processes

Evidence from flank ridges for long-term diminishing movements of the Slumgullion landslide, Hinsdale County, Colorado

Simulate landslide activities during flood season 2020 - 2021 in Phong Nha - Ke Bang National Park

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