Seismic vulnerability based on microtremor data and HVSR method in Krueng Raya, Aceh Besar

Asnawi, Yusran; Muksin, Umar; Tarniati, Yuni Putri; Simanjuntak, Andrean V. H.; Rizal, Syamsul; Syukri, Muhammad

doi:10.1063/5.0119573

Cited by 2 publications

(4 citation statements)

References 20 publications

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“…Seismic vulnerability indexes of Banda Aceh City and Aceh Besar Regency have been previously investigated by Simanjuntak et al [1], Simanjuntak et al [6], and Asnawi et al [7] by using an HVSR method. In the research performed by Simanjuntak et al [6], microtremor surveys were conducted surrounding the Seulimeum fault area at 20 points with an interval of 1 km between each point.…”

Section: Introductionmentioning

confidence: 99%

“…The results of the seismic vulnerability around the study area are 0.1 -0.5. The lastest research conducted by Asnawi et al [8] in the Darul Imarah sub-district focused on estimating shear wave velocity (Vs) closed to the Seulimum fault. Although, the microtremor surveys were conducted at 19 points, the analysis process was only applied for four points.…”

Section: Introductionmentioning

confidence: 99%

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Seismic vulnerability of the Campus II Universitas Syiah Kuala

Asra,

Fuhtra,

Muksin

et al. 2023

E3S Web Conf.

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Universitas Syiah Kuala (USK) is planning to develop a new campus (Campus II). The location of the study area is relatively close to the Seulimum fault which historically has generated a devastating earthquake. Therefore, a seismic vulnerability study is important to conduct in use for reference before the development. This study aims to determine the seismic vulnerability index in the Campus II development area of USK in Mesjid Raya District, Aceh Besar Regency using a Horizontal to Vertical Spectral Ratio (HVSR) method. Potential earthquake damage can be studied by analyzing the dominant frequency (f0), amplification (A0), seismic vulnerability (Kg), and Vs 30. The microtremor acquisition was carried out by using a Broadband seismometer with 100 sps at 37 measurement points with a distance of 500 meters for each station. We use the Geopsy software to analyze seismic data by applying Fourier transform and STA/LTA concept to Rayleigh waves and obtain the dominant frequency value. The 1D velocity inversion was derived by Dinver using the Neighborhood Algorithm (NA). The results of the analysis show that the dominant frequency value is higher around the STA17 point, while the amplification value and seismic vulnerability are highest in the north (at STA2 and STA3) and in the south (at STA28, STA29, and STA30). The higher amplification region is associated soft soil identified as alluvium (Qh). On the other hand, the 1D inversion results at a depth of 30 shows Vs values of 661.142 - 1106.31 m/s (at STA3 and STA17) which indicates the presence of bedrock, making it suitable for future development although more detail investigation is required.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic vulnerability of the Campus II Universitas Syiah Kuala

Asra,

Fuhtra,

Muksin

et al. 2023

E3S Web Conf.

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“…Buildings situated in the soft rocks regions are normally more vulnerable to be damage by earthquake shaking [5]. properties is important to have an overview of rock types prior large development [5,7].…”

Section: Introductionmentioning

confidence: 99%

“…The SPAC method provides a frequency -phase velocity relationship called a dispersion curve. The 1D velocity values were inferred from the relation between frequency and velocity[7].…”

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confidence: 99%

Microzonation of the seismically active region along the Seulimum fault

Syarani,

Muksin,

Asra

et al. 2023

E3S Web Conf.

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Banda Aceh and Aceh Besar regency is located between the two active faults, the Seulimeum and Aceh segments. In the near future, a large infrastructure development will be constructed in an area closed to the Seulimum fault. One of the development areas is the Campus II of Universitas Syiah Kuala. To prevent possible damage of infrastructure by a devastating earthquake, the developer needs to consider soil and rock types where the building is located. A region characterized by soft soil can lead to seismic amplification which can cause the damage of buildings and infrastructure. The objective of the research is to investigate the types of soil and rocks, called microzonation, in a seismically active region closed to the Seulimum fault. The types of rocks or soils can be classified based on the values of shear wave velocity (Vs) derived from the microtremor data. The acquisition of seismic data was carried out using a 4.5 Hz triangle array geophone at 35 measurement points. The microtremor data at each location was analysed by using the Spatial Autocorrelation (SPAC) to obtain the Rayleigh wave dispersion curve. The Vs values are then classified based on SNI 1726:2019. The results of the microtremor analysis showed that the Vs values are relatively high ranging from 300 m/s – 1500 m/s at different depths associated with hard rock as also observed in the field. At depth of 30 km, Vs30 is higher in the west and in the southeast while in the north the velocity is lower at around 300 m/s. It is suggested to investigate more detail and local type of rocks before infrastructure development to mitigate possible damages.

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Seismic vulnerability based on microtremor data and HVSR method in Krueng Raya, Aceh Besar

Cited by 2 publications

References 20 publications

Seismic vulnerability of the Campus II Universitas Syiah Kuala

Seismic vulnerability of the Campus II Universitas Syiah Kuala

Microzonation of the seismically active region along the Seulimum fault

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