Vs<sub>30</sub>Mapping and Site Classification in Surakarta City Based on Multichannel Analysis of Surface Waves Method

Kurniawan, Muhammad Fachrul Rozi; Koesuma, Sorja; Legowo, Budi

doi:10.1088/1742-6596/1204/1/012087

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…The geophysics study using microtremor analysis was later reported that the location of bed rock surface of Surakarta is at a depth variation of 145 m to 185 m [19]. The result of the geophysics studies also provided the information of shear wave velocity at a depth of 30 m from the surface and the variation of seismic site class map of Surakarta [20].…”

Section: Figure 1 the Location Of Surakartamentioning

confidence: 97%

Assessment of Seismic Loss in Surakarta School Buildings

Purwana¹,

Goro²,

Fitri³

et al. 2022

cea

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Surakarta is a relatively small yet is categorized as a densely populated city. There are a lot of types of public buildings, such as hospitals, supermarkets, government infrastructures, and school buildings. The city has more than 1100 school buildings threatened by many potential earthquakes. The possibility of an earthquake hitting Surakarta may be fatal and cause significant losses of buildings. However, studies on seismic hazard of the city are still very rare and need more attention. This paper presents a recent study on the seismic loss assessment of school building in Surakarta. The survey has been conducted by a team to visit, check, record and document all the required information to obtain exposure, combined with the information from google map application, while the seismic hazard analysis was carried out using the event-based stochastic method. An open-source application, OpenQuake, was utilized to assess the seismic loss and the results were presented here. The elaborated analysis is presented concluding that the exposure and vulnerability of school buildings are very important factors to determine a risk of loss. It indicates that the wooden school building contributes a highest risk of loss, whereas the confined masonry ones give a lowest risk. Among the whole sub districts in Surakarta, it is assessed that Laweyan suffers the biggest seismic loss of 2.36 million USD due to 500 years return period earthquake and 5.39 million USD due to 2500 years return period earthquake. These results of this study are valuable information for government in order to overcome disaster mitigation policy of Surakarta.

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Section: Figure 1 the Location Of Surakartamentioning

confidence: 97%

Assessment of Seismic Loss in Surakarta School Buildings

Purwana¹,

Goro²,

Fitri³

et al. 2022

cea

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“…Located along the banks of the Bengawan Solo River, Surakarta City is set in the lowlands, approximately 90 meters above sea level. However, the soft alluvial sedimentary [8] soil prevalent in the river basin area poses a challenge for constructing civil buildings [9]. The soil's high compressibility [10], low bearing capacity, and tendency to swell require careful [11], [12], [13] consideration in foundation design [14] , [15].…”

Section: Introductionmentioning

confidence: 99%

Geotechnical information system employs spatial analysis to utilize information gathered from Cone Penetration Testing (CPT)

Yanto

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Surakarta has diverse structures, including malls, shopping centers, hotels, offices, markets, hospitals, colleges, and schools. However, the Regional Government lacks a comprehensive data information system about the Cone Penetration Test (CPT). Such a system benefits investors seeking to develop new infrastructure in Surakarta. In order to tackle this problem, a research study was carried out to develop an Information System based on CPT data regarding the depth of hard soil throughout the city. The investigation analyzed pre-existing CPT data, its compilation, and cartographic representation. However, the arbitrary allocation of CPT data presents a challenge. Results of the study indicate that the most predominant depth of compacted soil qc 250 kg/cm2 in Surakarta is 3-5 meters below the surface. Moreover, comparing the depth of CPT soil in the field with GIS at multiple observation points indicates findings that mostly conform to GIS predictions and those of in situ tests. Combining CPT data with ArcGIS software has been a highly successful approach in identifying projects and providing robust geotechnical information.

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“…Soil characterization for seismic analyses has been conducted in some cities in Java, such as Jakarta by Asrurifak et (2013), andAldimar et al (2013), Semarang by Jananda et al (2014), Surakarta by Purwana, et al (2005), Sa'adah et al (2015), Warman et al (2016), and Kurniawan (2019). The seismic site classification map has been developed by Warman (2015) using 32 boreholes.…”

Section: Introductionmentioning

confidence: 99%

Updating of Surakarta Seismic Site Class Map Based on Standard Penetrtion Test

2020

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Surakarta is one of the cities in Java island with a high population growth rate, triggering the increase in the construction, especially for high-rise buildings. The city is close to several earthquake sources, causing a high level of seismic hazard. One of the main parameters of earthquake resistant buildings design is the value of peak ground acceleration at surface level. It is obtained by multiplying the peak ground acceleration in the bedrock by a multiplier factor that depends on the site class conditions of the location. A previous study has been conducted in 2015 using 32 boreholes indicating that around 19.5% of Surakarta area is classified as SC (hard soil), and 80.5% of the rest is SD (medium soil). To increase the accuracy, another 31 additional boreholes data are adopted. The new result shows that Surakarta is divided into three different seismic site class. Around 4.80% the area is classified as SC (hard soil), 94.50% is SD (medium soil), and 0,70% is SE (soft soil). The southern part of Surakarta has a higher level of vulnerability to earthquakes, especially in the border area between Banjarsari, Laweyan, and Serengan subdistricts which have a SE (soft soil) seismic site class. ABSTRAKSurakarta merupakan salah satu kota di Pulau Jawa dengan tingkat pertumbuhan penduduk dan sektor konstruksi yang tinggi. Kota ini cukup rentan terhadap gempa karena relatif dekat dengan sumbersumber gempa. Salah satu parameter utama disain bangunan gedung tahan gempa adalah percepatan puncak di permukaan tanah. Percepatan ini diperoleh dari perkalian percepatan puncak di batuan dasar dengan suatu faktor pengali yang tergantung pada kondisi kelas situs suatu tempat. Studi sebelumnya yang dilakukan pada tahun 2015 menggunakan 32 lubang bor menunjukkan bahwa sekitar 19.5% area Surakarta digolongkan sebagai tanah SC (tanah keras), dan sisanya 80.5% merupakan lapisan tanah SD (tanah sedang). Untuk meningkatkan akurasi, 31 data bor baru telah ditambahkan. Hasilnya menunjukkan bahwa sekitar 4.8% merupakan tanah SC (tanah keras), 94.5% merupakan tanah SD (tanah sedang), dan 0.7% merupakan tanah SE (tanah lunak). Tanah SE ini terlatak di bagian selatan Surakarta yaitu di perbatasan Kec. Banjarari, Laweyan, dan Serengan, dan merupakan area dengan tingkat kerentanan terhadap gempa paling tinggi.

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Vs₃₀Mapping and Site Classification in Surakarta City Based on Multichannel Analysis of Surface Waves Method

Cited by 3 publications

References 12 publications

Assessment of Seismic Loss in Surakarta School Buildings

Assessment of Seismic Loss in Surakarta School Buildings

Geotechnical information system employs spatial analysis to utilize information gathered from Cone Penetration Testing (CPT)

Updating of Surakarta Seismic Site Class Map Based on Standard Penetrtion Test

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Vs30Mapping and Site Classification in Surakarta City Based on Multichannel Analysis of Surface Waves Method

Cited by 3 publications

References 12 publications

Assessment of Seismic Loss in Surakarta School Buildings

Assessment of Seismic Loss in Surakarta School Buildings

Geotechnical information system employs spatial analysis to utilize information gathered from Cone Penetration Testing (CPT)

Updating of Surakarta Seismic Site Class Map Based on Standard Penetrtion Test

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Product

Resources

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Vs₃₀Mapping and Site Classification in Surakarta City Based on Multichannel Analysis of Surface Waves Method