Liquefaction investigation of Balaroa, Central Sulawesi on liquefied and non-liquefied areas

Muhanifah, Hevina; Adi, Agus Darmawan; Faris, Fikri

doi:10.1088/1755-1315/861/5/052039

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…Then, a classification was carried out based on the division of the risk level of potential liquefaction to get the category of potential liquefaction [8]. This categorization has been confirmed in several other studies [9] and [10]. Then the category of potential liquefaction can be seen in Table 1.…”

Section: Theoretical Studiesmentioning

confidence: 64%

Analysis of liquefaction potential in the Malalayang beach area, North Sulawesi

Prayogo,

Faris

2023

IOP Conf. Ser.: Earth Environ. Sci.

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North Sulawesi Province was locating in a tectonically active area, affected by subduction of the Sulawesi Sea plate, Sangihe, and Halmahera. These plates are still active to provide an earthquake threat. Several large earthquakes that came from various plates around Manado City have been recorded. A large earthquake that shakes sandy soil can produce liquefaction events. The Malalayang beach area, located in the West of Manado City a part of Malalayang Beach Area Arrangement Work Package and the Bunaken Village Ecotourism Arrangement, was chosen as the research object to analyse the possibility of liquefaction. The research begin with collect boring testing data, lab test data, and earthquake data such as the moment of magnitude and Peak Ground Acceleration (PGA). This study also uses various methods or attenuation equations to determine the peak ground acceleration from the history of earthquakes obtained from multiple sources. Based on the data obtained from the field and laboratory tests, data processing is carried out to determine the liquefaction potential. From the results of the Liquefaction Potential Index (LPI) calculation, it was found that the Malalayang Beach Area has the potential for the occurrence of the liquefaction phenomenon.

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Section: Theoretical Studiesmentioning

confidence: 64%

Analysis of liquefaction potential in the Malalayang beach area, North Sulawesi

Prayogo,

Faris

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…7. Liquefaction layers of greater thickness in close proximity to the ground surface, which provide direct support for buildings at ground level, can result in more significant instances of ground failure [31]. It is recalled that at the base value, which was the input earthquake record, has a peak of 0.25 g. The peak horizontal acceleration value at the crest of the slope reached a value 0.441 g, as is evident from Fig.…”

Section: Soil Liquefactionmentioning

confidence: 78%

Geotechnical Assessment of Sublake Slopes and Liquefaction Hazard in Lake Toba, Indonesia

Ariani

2023

GEOMATE

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Lake Toba, the largest lake in Sumatra Island, is a volcanic lake that holds great significance both geologically and culturally. It has a breathtaking natural wonder that captivates visitors from around the world. The fluctuation of surface levels in Lake Toba adds another layer of complexity to the stability of its sublake slopes during seismic activity. The key aim of this paper is to study the sublake slope stability, likelihood of liquefaction potential, and permanent deformation that subject to the fluctuation of Lake Toba surface levels. This research was conducted the numerical analysis of GeoStudio 2022.1 software by combining QUAKE/W, SLOPE/W, and SIGMA/W to evaluate the pre-and post-earthquake condition. The slope stability in the pre-earthquake condition was stable regardless of the reduced safety factor along with the declining lake surface level, but in the post-earthquake condition the safety factor was reduced nearly 60%, resulting in slope instability. An earthquake exhibits 0.25 g of acceleration within a period of 44.435 s, caused liquefaction up to 7.7 m layer of soil structure and high amplification of the ground surface approximately to 0.44 g. Massive permanent deformation occurred as the result were varying from 7 m to 12.1 m. As the surface level decreases, potential for liquefaction decreases as well but the safety factor value of slope stability increases, which can lead to a greater increase in the potential for permanent deformation. This indicates that the declining of the lake surface level influences slope failure during an earthquake.

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“…Thus, knowledge of the liquefaction potential of alluvial deposits is necessary to reduce the risk associated with earthquake-induced liquefaction phenomena in Palu City. Some previous studies have been conducted to analyze liquefaction phenomena, especially in flow liquefaction areas using SPT [3,4] and Vs methods [5]. This paper presents the results of liquefaction potential analysis based on the CPT method in some locations around the city where sand boiling occurred during the 2018 earthquake.…”

Section: Introductionmentioning

confidence: 99%

Liquefaction potential analysis for Palu City based on CPT method

Tohari¹,

Soebowo²,

Wibawa³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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During the 28 September 2018 Palu-Donggala earthquake, liquefaction was also a prominent hazard causing significant damage to buildings and infrastructures in Palu City. To mitigate such a hazard in Palu City, knowledge of the depth of the liquified soil layer is necessary. This paper presents the results of CPT-based liquefaction potential analysis in some locations around the city where sand boiling and ground settlement occurred. The analysis shows that liquefaction occurs at various depths less than 15 m and may induce ground settlement up a few centimeters. In the Palu-Koro Fault zone, the liquified sand layer is likely thicker than in other locations. Consequently, the total ground settlement is higher than in other locations The results of this study suggest that the liquefaction potential should be accounted for in the development of Palu City to reduce future earthquake risk.

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Liquefaction investigation of Balaroa, Central Sulawesi on liquefied and non-liquefied areas

Cited by 7 publications

References 4 publications

Analysis of liquefaction potential in the Malalayang beach area, North Sulawesi

Analysis of liquefaction potential in the Malalayang beach area, North Sulawesi

Geotechnical Assessment of Sublake Slopes and Liquefaction Hazard in Lake Toba, Indonesia

Liquefaction potential analysis for Palu City based on CPT method

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