Paleostress analysis on the landslide boundary faults is able to explain the sliding mechanism. This method is particularly useful to study a paleolandslide. About 30 striated fault planes from the Parangtritis paleo-landslide, located in the Yogyakarta coastline, were analyzed to define their principle stress axes. The eastern boundary fault, named as the Girijati Fault, was the main fault responsible for the mass movement and leaving a considerable steep cliff. It moved normal in a left lateral sense with ENE – WSW extension and dragged the rockmass southward, creating a NNW – SSW extension along the Parangtritis Fault and turn it into the western boundary fault. The rockmass slided along the stratigraphic contact between the underlying Nglanggran Formation and the overlying Wonosari Formation, created a semi-circular crown cliff as the northern boundary and produced some isolated topographic highs of the thrust block near the toe. Keywords: Paleostress, landslide boundary, fault, paleolandslide
The Indonesian Archipelago is one dynamic volcanic arc region, where landslides frequently occur during the rainy season. Not only are geological conditions and high precipitation in the region, but also uncontrolled land use development and high social-vulnerability of the community living in landslide prone areas, that have become the major cause of landslide disasters in Indonesia. Accordingly, a strategic program for landslide risk reduction has been carried out by establishing an appropriate landslide risk management program with respect to social vulnerability. Such programs mainly emphasize the improvement of community resilience in landslide prone areas through community based landslide mitigation and early warning system, as well as public education. Geological investigations combined with social survey and analyses were also carried out to support the implementation of this risk reduction program in Central Java. Finally, it was concluded that the effectiveness of landslide disaster risk reduction was mainly driven by the community empowerment for disaster prevention and mitigation at the village level.
A rain-induced landslide has occured in Guyon Village, Tengklik Tawangmangu District Karanganyar Regency, Central Java Province, Indonesia on February 2009. The movement was initiated by crack occurrence, 30 cm in depth and 2 meter in length. Such crack continuously developed in depth, extention and numbers, until then it resulted in land subsidence up to 260 cm in depth. Accordingly, ten houses were damaged and ten of families must be evacuated. This subsidence is very potential to further grow and create more consequences for human life and houses / land damage. Therefore, this research is carried out to understand the influence of geological factors and rainfall to the landslide phenomena. This research conducted engineering geology investigation such as mapping, drilling, insitu test, XRD test, soil mechanic test and slope stability analysis by limit equilibrium method i.e. Seep/W and Slope/W. By those research activities, the cause and mechanism of landslide can be understood. Rainfall characteristics which triggered such landslide can also be identified. Based on those investigations, it is found that the landslide occurred in slow rate sliding (creep) due to the control of slope stratigraphy conditions and gentle slope inclination, which is induced by rainfall. Stratigraphy condition that plays important role in landslide mechanism are the permeable layers consisted of sandy silt (shear strength 12 kPa) and silty sandstone (shear strength 18 kPa) overlaid above impermeable andesite breccia (shear strength 104 kPa). Undulating slope may induce landslide in creep rotational type. Based on slope stability simulation, it is known that rainfall triggered landslide is rainfall 20 mm/ day average precipitation in 55 days and rainfall 20 mm/ day average precipitation in 49 days followed by one day with 178 mm/ day average precipitation. Keywords: Landslides, slope stability
A big earthquake occurred on September 20, 2009 in Padang, West Sumatra, Indonesia. This earthquake caused damage and loss of both property and lives. The earthquake also triggered the emergence of rock falls in several areas in Padang, especially in the road of Padang to Bukitinggi. After the earthquake in September, several big rockfalls occurred more than three times that cost lives. Based on field investigations, the incidence of rock falls was caused by field conditions which was prone to rockfall, such as steep slope and exposure of rocks to intensive structures that then triggered by earthquake and rainfall. Therefore, fast action is needed to be taken in order to minimize the impact of the rockfall disaster. Keywords: Rockfall, slope, rock structure, earthquake, rainfall
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