Seismic Microzonation Studies Considering Local Site Effects for Yogyakarta City, Indonesia

Fathani, Teuku Faisal

doi:10.21660/2017.32.63655

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…The model applied earthquake ground motions at the base of the soil column to analyze seismic wave propagation [12,13,14]. In this investigation, three seismic acceleration records from PEER NGA database were used.…”

Section: Seismic Motionmentioning

confidence: 99%

Seismic Response Analysis of a Layered Soil Column Under Different Water Conditions

Ibagon¹

2023

GEOMATE

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The seismic site effect is influenced by the soil's dynamic properties. These properties are affected by the soil´s water content, which varies according to climatic conditions. This work aims to analyze the seismic site effect of a thirty-meter soil column which has different water table levels. An evaporation simulation is conducted on these columns. The mechanical properties under different suction pressures were obtained from previous research. Then, a finite-difference model was used to simulate the soil-environment interaction and the results were applied to build the water profiles of the column. Finally, a finite element model was used to simulate the seismic response at the top of the deposit. The results showed a remarkable difference in soil response according to the degree of saturation of the column. The change in saturation due to climate conditions does not have a significant effect. On the other hand, the results showed that the water table level affects the response of the deposit. The deposit with dryer conditions had a greater response acceleration in the surface than the deposit in a wetter state. This work opens many research possibilities, where the influence of water content and climate conditions in soil's mechanical and dynamical properties can be studied. These investigations would help achieve a better understanding of soil behavior and its interaction with the environment.

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Section: Seismic Motionmentioning

confidence: 99%

Seismic Response Analysis of a Layered Soil Column Under Different Water Conditions

Ibagon¹

2023

GEOMATE

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“…Non-linear earthquake site response analyses (NERA) is an excel-based software developed by Bardet and Tobita (2001) to calculate one-dimensional site response in layered soil, considering shear wave velocity at each layer and acceleration response spectrum (including PGA) as output [19]. Fathani and Wilopo (2017) have used the use of NERA in determining the PGA value for Yogyakarta City, and the result PGA value from NERA is higher than other methods (Attenuation function and microtremor) [20]. The output of NERA is dependent on ground motion input selection.…”

Section: Non-linear Earthquake Site-response Analysismentioning

confidence: 99%

Ground Motion and Liquefaction Study at Opak River Estuary Bantul

Zakariya,

Rifa’i,

Ismanti

2023

IOP Conf. Ser.: Earth Environ. Sci.

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In Mei 2006, an earthquake occurred, and liquefaction was induced in Bantul Regency in the form of lateral spreading and sand boiling. Based on Indonesia’s liquefaction susceptibility zone map 2019, the Bantul coast was identified as a high liquefaction hazard zone. There is a high risk of liquefaction in that location, and if liquefaction occurs, the effective stresses of the soil will be lost. This study aimed to determine ground motion-induced liquefaction potential in Opak river estuary in Bantul. The peak ground acceleration can be predicted by probabilistic seismic hazard analysis (PSHA) based on Indonesian spectra design application, deterministic seismic hazard analysis (DSHA) based on the mechanism of a recent earthquake in Bantul, and non-linear earthquake site response analysis (NERA) based on the 2004 Parkfield California earthquake, the 1986 Chalfant Valley California earthquake, and the 1987 Superstition Hill California earthquake. The value of acceleration from site-specific responses with DSHA and NERA is 0.558 g. Then, the maximum acceleration, seismic magnitude, N-SPT bore log soil, and other soil parameters are analyzed with a semi-empirical simplified method to estimate the safety factor of liquefaction potential using Settle3. The liquefaction safety factor was calculated by dividing the cyclic resistance ratio by the cyclic stress ratio; liquefaction occurs if the safety factor is less than 1. The result indicates that the Opak river estuary has a liquefaction potential beneath the surface from -1.5 to -16.5 m depth with various thick each boreholes. It implies that the bearing capacity design of the foundation system in this area and the liquefaction effect that will emerge when an earthquake occurs must be appropriately considered.

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“…However, there is a lack of comprehensive research regarding the determination of Peak Ground Acceleration at this specific location. Comparative research on PGA and PGA microzonation in Indonesia has only been conducted in Yogyakarta [2]. The research reported a range of PGA values, from 0.05 g based on microtremor measurements to 0.57 g calculated using the Indonesian seismic code SNI 1726:2012.…”

Section: Introductionmentioning

confidence: 99%

Seismic Microzonation Studies in Jogja–bawen Toll Road, Magelang Regency, Indonesia

Dayen Siadari

2023

GEOMATE

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Peak Ground Acceleration (PGA) is a crucial factor in infrastructure planning, particularly in the context of constructing the Jogja-Bawen Toll Road in Magelang Regency. However, there is a lack of comprehensive research on the optimal PGA value for this region. This research addressed this gap by analyzing two significant earthquake scenarios, namely the Bantul and Yogyakarta earthquakes, with magnitudes of 6.3 Mw and 7.44 Mw, respectively. Three methods were employed for this analysis, namely the Indonesian seismic code, Kanno (2006), and Fukushima (1990) attenuations, as well as microtremor measurements. The PGA value generated by the seismic code ranges from 0.348-0.380g. For the 6.3 Mw earthquake scenario, the Kanno attenuation results in a PGA range of 0.115-0.181g, the Fukushima attenuation yielded 0.082-0.114g, and the microtremor measurements indicated 0.036-0.092g. In the case of the 7.44 Mw earthquake scenario, the Kanno attenuation generated a PGA range of 0.202-0.265g, the Fukushima attenuation produced 0.052g-0.062g, and the microtremor measurements indicated 0.036g-0.088g. The result showed that the PGA value derived from the seismic code is relatively higher because it considered various earthquake models and magnitudes. Meanwhile, the PGA value obtained from microtremor measurements was smaller due to the consideration of site class and site-specific amplification factors at the study site.

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Seismic Microzonation Studies Considering Local Site Effects for Yogyakarta City, Indonesia

Cited by 3 publications

References 16 publications

Seismic Response Analysis of a Layered Soil Column Under Different Water Conditions

Seismic Response Analysis of a Layered Soil Column Under Different Water Conditions

Ground Motion and Liquefaction Study at Opak River Estuary Bantul

Seismic Microzonation Studies in Jogja–bawen Toll Road, Magelang Regency, Indonesia

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