Hary Christady Hardiyatmo

Universitas Gadjah Mada

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Dwikorita Karnawati

Meteorological, Climatological, And Geophysical Agency

Dwi Winarti

University of Muhammadiyah Mataram

Arif Ismul Hadi

University of Bengkulu

Fikri Faris

Universitas Gadjah Mada

J Prayogo

Universitas Gadjah Mada

Srijono Srijono

Universitas Gadjah Mada

Kirbani Sri Brotopuspito

Universitas Gadjah Mada

Subagyo Pramumijoyo

Universitas Gadjah Mada

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Universitas Gadjah Mada

ADA University

Meteorological, Climatological, And Geophysical Agency

University of Muhammadiyah Mataram

University of Bengkulu

Shimane University

University of Shimane

University of Yangon

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ANALYSIS OF LIQUEFACTION EFFECT ON SETTLEMENT USING ROCSCIENCE SETTLE AT MALALAYANG BEACH AREA, NORTH SULAWESI

J Prayogo Fikri Faris Hary Christady Hardiyatmo

The Malalayang Beach area is a strategic tourist destination close to Manado city. Arrangement of the area is carried out by building several buildings that can support this area as a tourist destination. Liquefaction is a phenomenon when the soil loses its strength of contact between particles. This is due to earthquake shocks that trigger an increase of water pressure in areas with loose sand characteristics (not dense). The settlement of soil due to liquefaction is a vertical deformation of the soil in the soil layer caused by soil compaction due to earthquakes. The study purpose is to determine how much reduction could occur at the research site as an early stage of the early stages of risk management. With the N-SPT data, the Yoshimine method and the computational method Rocscience Settle 3D can be used to analyze the settlement. Yoshimine method indicates settlement with a very low classification in BH-MLY-01 and high in BH-MLY-05. In RS Settle 3D, the location of BH-MLY-01 has a very low classification, and the location of BH-MLY-05 is dominated by low classification. The maximum settlement resulted from the Rocscience Settle 3D at the BH-MLY-05 location by 11,588 cm.

Settlement (finance)

Soil Compaction

Soil liquefaction

10.20885/icsbe.vol4.art38

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Mineralogical and Geochemical Control of Altered Andesitic Tuff upon Debris Slide Occurences at Pelangan Area, Southern Mountain of Lombok Island, Indonesia

Journal of Applied Geology (2016)

Dwi Winarti Dwikorita Karnawati Hary Christady Hardiyatmo Srijono Srijono

Debris slides were recently found in the Pelangan area at Southern Mountain of Lombok Island, Indonesia. Pelangan is well known as the gold mineralization and hydrothermal alteration area. This study is aimed to identify the mineralogy and geochemistry of altered andesitic tuff that controlled slope instability and induced debris slides. For this purpose, it is necessary to prepare the field observation and laboratory analyses. Landslide inventory reveals that the Pelangan debris slides mostly occur in altered andesitic tuff. Based on the outcrop observations in the field, andesitic tuff found around the Pelangan debris slides have been altered in general. The strong intensity of alteration developed by hydrothermal alteration in this study area produces large amount of clay minerals especially montmorillonite, kaolinite, and illite. The abundance of those clay minerals reflect the intermediate argillic alteration. Montmorillonite is a type of clay mineral that easily swells at wet condition and easily shrinkages at dry condition. Swelling of clay mineral destroys intersheet and interlayer bonds, and reduces shear strength. The presence of clay minerals in the altered andesitic tuff of intermediate argillic zone can be considered as one of the factors that induced to the Pelangan debris slides. Further studies on geotechnical and slope stability analysis of the landslide area are crucial to be done for better understanding of the characteristics of the altered rocks inducing hazardous landslides.

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10.22146/jag.26953

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Regional Landslide Potential Mapping in Earthquake-Prone Areas of Kepahiang Regency, Bengkulu Province, Indonesia

Geosciences (2018)

Arif Ismul Hadi Kirbani Sri Brotopuspito Subagyo Pramumijoyo Hary Christady Hardiyatmo

Kepahiang regency is an area above the Musi segment of the Sumatran fault system. This condition makes the study area prone to natural disasters such as landslides in the slope area caused by earthquakes due to tectonic plate movement. The objective of this study was to locate potential landslide areas in earthquake-prone areas of Kepahiang regency, Bengkulu province, Indonesia. We performed horizontal to vertical spectral ratio (HVSR) analysis and simple additive weighting (SAW) methods to accomplish the goal. The acquisition of field data involved a broad band seismometer PASI Gemini-2 (triaxial geophone). The microtremor data recorded in the field were then analyzed by the wave spectrum. The results showed that the landslide potential in the study area could be divided into three categories, i.e., low, medium, and high potential. Areas with high potential should be more aware of the threat of landslides, especially in population-dense areas. The greatest threat in the study area is an earthquake along Sumatra’s active fault. An earthquake that occurs in a very steep, landslide-prone area can increase risk and trigger a landslide.

Microtremor

Seismometer

Geophone

Rockfall

10.3390/geosciences8060219

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Citations (16)