Paleostress Analysis to Interpret the Landslide Mechanism: A Case Study in Parangtritis, Yogyakarta

Husein, Salahuddin; Sudarno, Ignatius; Pramumijoyo, Subagyo; Karnawati, Dwikorita

doi:10.22146/jag.7251

Cited by 8 publications

(11 citation statements)

References 2 publications

(3 reference statements)

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“…The extension of Girijati and Parangtritis Fault which forms a semi-circular crown structure (Prasetyadi et al, 2011) produced paleo-landslides deposits with estimated dimensions of 2,700 m long, 1,500 m wide, and 810 million m 3 of landslide volumes (Husein et al, 2010) in a gravel-boulder grain size. These landslide deposits are very prone to move and/or collapse and believed to be one of the causes of most recent landslide events in the study area.…”

Section: Rockfall Hazard Zonationmentioning

confidence: 99%

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Slope Mass Rating-based Analysis to Assess Rockfall Hazard on Yogyakarta Southern Mountain, Indonesia

Triana

Hermawan

2020

Preprint

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In the Parangtritis Beach tourism area located in the Southern Mountain of Yogyakarta, karst hills were excavated to build the main accessing road and produce some of long and very steep slopes along the sides of the road. But still, there was none of the slope reinforcement installed along the road. Meanwhile, at several nearby locations within Southern Mountain, rockfall incidents have occurred many times even caused casualties. The potential of rockfall hazard also could be found in the main road of Parangtritis Beach as the study area. The purpose of this study is to determine the rockfall hazard assessment along the main road using Slope Mass Rating (SMR) analysis with the additional parameter of the slope height and the rock block size. The necessary data obtained by direct measurement and laboratory test. Geomechanics analysis, stereographic projection analysis, and hazard parameters weighting were carried out to produce the Rockfall Hazard Zonation Map of the study area. Based on 17 measurement stations, there are 4 (four) rockfall hazard classes in the study area, i.e., very low, low, moderate, and high. The class of very low, which also included road segments without slope, has the largest percentages of 83.83%, followed by the classes of moderate, low, and high with the percentage of 7.16%, 4.28%, and 4,19%, respectively. SMR was assumed as the most significant parameter that influences the rockfall hazard zonation. Historical rockfall points were overlaid over the Rockfall Hazard Zonation Map to validate the predicted hazard zones. Since 91.23% of the rockfall occurred in the moderate and high hazard classes, the zonation map considered reliable to predict future rockfall. This study also identified several landslide potential zones and provides the recommendation of slope reinforcement to be installed in the study area. Keywords: Rockfall, Slope Mass Rating, Hazard zonation, Slope reinforcement, Hills.

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Section: Rockfall Hazard Zonationmentioning

confidence: 99%

“…But still, there was none of the slope reinforcement installed along the road. The road also located near to the Girijati Fault, which has 250 meters of steep slope and estimated to be the main trigger of the rock mass movements in the area (Husein et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Slope Mass Rating-based Analysis to Assess Rockfall Hazard on Yogyakarta Southern Mountain, Indonesia

Triana

Hermawan

2020

Preprint

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“…This road access has a fairly dense activity and frequently visited by local and international visitors. The Girijati Fault which has 250 meters of steep slope is estimated to be the main trigger of the rock mass movement in the area (Husein et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…This fault movement activates the Parangtritis Fault as the extension in the west. Both of these faults produced a rock-shaped semi-circular landslide crown (Husein et al, 2010) that was traversed by the main road access connecting both villages. Meanwhile, to entering the area, karst mountain cutting is needed to support the growth of the tourism sector.…”

Section: Introductionmentioning

confidence: 99%

Slope Mass Rating-based Analysis to Assess Rockfall Hazard on Yogyakarta Southern Mountain, Indonesia

Triana

Hermawan

2020

Preprint

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The main road to the Parangtritis Beach tourism site in the southern Yogyakarta Province, Indonesia, has full of local and economic activities. The road was made mainly by karst mountains cutting and resulting in almost vertical long and high slopes by its side. Rockfall is being the most potential hazards occurred in this area. The purpose of this study is to determine the rockfalls hazard assessment along the main road using Slope Mass Rating (SMR) analysis. Parameters used in rockfall hazard assessment are SMR with additional valuation from the slope height and the block size. The necessary data of each parameter obtained by direct measurement and the uniaxial compressive strength test in the laboratory. Geomechanics analysis, stereographic projection analysis, and hazard parameters weighting are needed to produce research results in form Rockfall Hazard Zonation Map in the research location. The results showed that the largest percentage of rockfalls hazard class is very low class, with 83,83% of the total hazard classes, associated with normal SMR score (51,66 – 51,75), slope height between 2,85 – 4,57 m, and block size 0,2 – 0,3 m. Followed by intermediate class with 7,16% of the total hazard classes with very bad to bad SMR score (5,82 – 38,15), slope height between 4,26 – 8,96 m, and block size 0,3 – 1,0 m. In the third position followed by a low class with 4,28% of the total hazard classes with bad to normal SMR score (31,17 – 53,03), slope height between 3,52 – 5,28 m, and block size 0,2 – 0,7 m. The last position was taken by high class with 4,19% of the total hazard classes with very bad to bad SMR score (18,31 – 36,50), slope height between 3,62 – 7,82 m, and block size 0,7 – 1,3 m. The SMR analysis also identified the influence of rock types with the rockfall occurrence. Hazard zonation map verification showed a congeniality with the results of rockfalls quantity inventory in the research area.

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“…Although basal shear stress and pore fluid pressure measurements have been made in MTDs (e.g., Iverson 1997;Ilstad et al 2004aIlstad et al , 2004bD'Agostino et al 2013), it is difficult to directly measure pore fluid pressures. Previous studies have therefore employed stress tensor inversions to reconstruct the paleostresses within gravitational slope failures (e.g., Husein et al 2010;Naruse and Otsubo 2011a;Baroň et al 2013Baroň et al , 2017. Naruse and Otsubo (2011a) documented the internal structure of a submarine MTD in the Akkeshi Formation of the central section of the Upper Cretaceous-Paleocene Nemuro Group, eastern Hokkaido Island, northern Japan (Figs.…”

Section: Introductionmentioning

confidence: 99%

Temporal changes in the internal stresses and pore pressures in a large-scale submarine mass transport deposit

Otsubo

Naruse

Miyakawa

2018

Prog Earth Planet Sci

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We examined the temporal changes in the internal stresses and pore fluid pressures of a submarine mass transport deposit (MTD) in the Akkeshi Formation of the Upper Cretaceous-Paleocene Nemuro Group, eastern Hokkaido Island, Japan. We first analyzed previous paleostress field results from meso-scale faults in the MTD blocks, which indicated two phases during the evolution of the debris flow: phase I, radial spreading of the flow body during downslope movement; phase II, the flow body underwent compression during deposition on the basin plain. We also estimated the pore fluid pressure ratio from the fault orientation distribution. There was a large increase in the pore fluid pressure ratio during the transition from phase I to phase II that continued to rise during the initial stage of phase II and then decreased in its latter stages, whereas the maximum horizontal compressive stress increased throughout phase II. This variation in pore fluid pressure relates to the dynamics and evolution of the debris flow, where the clasts in the central part of the flow were supported by the excess pore pressure due to the compression of the debris flow as the flow head decelerated. Although pore fluid pressure plays a critical role in the dynamics of debris flows, there was no previous methodology to quantify both the stress fields and pore fluid pressures in large debris flows and their resultant MTDs. Our results implemented for outcrop studies imply that meso-scale faults in MTDs can provide clues to better understand these paleoflow mechanisms.

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Paleostress Analysis to Interpret the Landslide Mechanism: A Case Study in Parangtritis, Yogyakarta

Cited by 8 publications

References 2 publications

Slope Mass Rating-based Analysis to Assess Rockfall Hazard on Yogyakarta Southern Mountain, Indonesia

Slope Mass Rating-based Analysis to Assess Rockfall Hazard on Yogyakarta Southern Mountain, Indonesia

Slope Mass Rating-based Analysis to Assess Rockfall Hazard on Yogyakarta Southern Mountain, Indonesia

Temporal changes in the internal stresses and pore pressures in a large-scale submarine mass transport deposit

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