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Jurnal Stasiun Geofisika Sleman (JSGS)
Published by Stasiun Geofisika Kelas I Sleman
ISSN : -     EISSN : 30263875     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Jurnal Stasiun Geofisika Sleman (JSGS) diterbitkan oleh Stasiun Geofisika Kelas I Sleman sebagai media apresiasi Karya Tulis Ilmiah (KTI) yang bersumber dari kegiatan penelitian berbasis ilmu-ilmu Meteorologi, Klimatologi, Kualitas udara, dan Geofisika (MKKuG).
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 21 Documents
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Pemetaan Kecepatan Gelombang Geser Hingga Kedalaman 30 Meter di Wilayah Jakarta Selatan Menggunakan Inversi Eliptisitas Rayleigh Bambang Sunardi; Dwi Budi Susanti; Nana Dyana; Amirul Fitria Adila; Wuri Handayani
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 1 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Recent research has revealed that there is a potential for large earthquakes in the southern area of Jakarta due to the Baribis fault which extends from Purwakarta, Karawang, Bekasi, south of Jakarta, Tangerang, to Banten. The fault is most likely active, with the western part still locked. This locked section makes Jakarta and its surroundings vulnerable to major earthquakes in the future. The purpose of this study was to map the average shear wave velocity to a depth of 30 m (Vs30) in the South Jakarta area using the Rayleigh wave ellipticity inversion method. The microtremor data used were 15 points around the South Jakarta area. Microtremor data were analyzed using the HVTFA method from Geopsy, and inversion was performed to obtain a shear wave velocity (Vs) profile for each measurement point. Furthermore, the value of Vs30 is calculated based on the formula in SNI 1726:2019. The results showed that the value of Vs30 varied from 190–350 m/s. The Vs30 mapping shows that the northern part of Pesanggrahan and Kebayoran Lama Districts has a higher Vs30 value. Detailed soil condition maps based on the Vs30 distribution are very important not only for urban settlements but also for site selection and site safety evaluation studies
Identifikasi Daerah Rawan Longsor Berdasarkan Kecepatan Gelombang Geser (Vs30) Di Desa Salamkanci, Kecamatan Bandongan Ilqima Rahma; Dian Susri Nurhaci
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 1 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Bandongan District is one of the sub-districts in Magelang Regency which has a detailed area of 45.79 km2 which has a fairly high history of landslides. This research aims to identify landslide-prone areas based on microseismic parameters using microtremor measurement data by BMKG Class I Sleman Yogyakarta. Microtremor analysis was carried out using the HVSR method with the help of Geopsy software. The H/V curve inversion was carried out using the dinver program to obtain a ground profile containing the depth of each layer relative to the shear wave velocity value. The research results show that the range of dominant frequency values is relatively varied and is in the range between 1.01502 - 17.6748 Hz. The amplification value is in the range between 2.64533 - 23.5064 with a large distribution of dominantly high amplification factors. The value of shear wave velocity up to a depth of 30 meters (Vs30) in this area is classified as moderately dominant with a range of 209.16 – 876.90 m/s which is included in the classification of solid soil and soft rock in the form of clay and breccia. This area has varying sediment thickness but is dominated by thick sediment with a range of 3.86 – 232 meters. The area in Bandongan District, Magelang Regency which has the highest level of vulnerability to landslides is found at measurement point number 19 with a high risk of damage.
Analisis Koefisien Korelasi Peak Ground Acceleration Dengan Metode Oliviera dan Shakemap BMKG, Studi Kasus Gempabumi Bantul 16 Januari 2022 Salma Aprillina Kurniawan; Efita Pratiwi Adi; Wuri Handayani; Setyoajie Prayoedhie
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 1 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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The analysis of the coefficient correlation of peak ground acceleration (PGA) using Oliviera Method and BMKG’s shakemap based on case study of the earthquake in Bantul January, 16th 2022. This study aims to determine of peak ground acceleration value and to determine coefficient correlation value of peak ground acceleration and BMKG’s shakemap. The earthquake data used is the earthquake data on January 16th 2022 in Bantul. Based on this data, PGA value when using the Oliviera method is 10.109 gals or 0.0101 g. Meanwhile, PGA value of BMKG’s shakemap is 70.28543 gals or 0.070285 g. The result of the coefficient correlation between PGA value uses Oliviera method with PGA value of BMKG’s shakemap is 0.9958. It shows the relationship between the two values has a positive curve and shows a strong relationship.
Studi Awal Mikrozonasi dan Klasifikasi Site Wilayah Jakarta Selatan Rifa Salma Salsabila; Bambang Sunardi; Setyoajie Prayoedhie
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 1 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Microzonation mapping is very necessary in the south Jakarta area because the effects of earthquakes are often felt. This region also has a very high population density. Microzonation is needed to reduce the risk if an earthquake occurs. Another effort to support earthquake microzonation is by conducting site classification. One of the data that can be used is microtremors which are then processed using the Horizontal to Vertical Spectral Ratio (HVSR) method. Furthermore, the HVSR inversion process can be used to obtain the value of the shear wave velocity (Vs). In this research, the creation of a microzonation map includes a dominant frequency map, amplification factor, seismic vulnerability index, and site classification map. The research results show that in the South Jakarta area, especially the Pesangrahan, Kebayoran Lama, Kebayoran Baru, Setiabudi and Tebet districts, the dominant frequency (fo) is relatively low, the amplification factor is relatively high, and the dominant site is classified as medium soil (SD). Based on this, in general the South Jakarta area has a relatively high risk of earthquakes.
Penentuan Aftershock Gempabumi Yogyakarta Tanggal 6 Juni 2006 Dengan Menggunakan Metode Geiger Dinda Shakila Farah; Setyoajie Prayoedhie; Budiarta Budiarta; Dini Vermiratih; Yusuf Hadi Perdana
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 1 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
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Abstract

The 2006 Yogyakarta earthquake was a shallow crustal tectonic earthquake that rocked the Special Region of Yogyakarta (DIY) and its surroundings on May 27, 2006. This earthquake was followed by many aftershocks up to 10 days later, namely on June 6, 2006. To get information about the distribution aftershock of earthquake, aftershock parameter processing was carried out on June 6, 2006. Determination of the aftershock parameters was carried out using SeisComp3 software with the principles and theory of the Geiger method. The Geiger method is a method that uses least squares optimization to determine the hypocenter and epicenter points. There were 122 earthquakes that occurred on June 6, 2006 with earthquake magnitudes ranging from 0.8 – 3.7 and occurring at depths of 1.5 km – 18.6 km. Aftershock aftershocks spread along the border of Bantul and Gunungkidul Regencies, due to the Opak fault and the many minor faults around the Opak fault. This causes the Bantul and Gunungkidul Regency areas to be very active in terms of seismicity.
Penentuan Klasifikasi Tanah Dengan Menggunakan Metode Multi-channel Analysis of Surface Waves Di Kapanewon Pleret, Kabupaten Bantul Zawawi, Aditya Fais; Sunardi, Bambang; Setyoajie Prayoedhie, Setyoajie
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Kapanewon Pleret, Bantul Regency, is one of the areas prone to earthquakes. One of the earthquakes that occurred was the 27 May 2006 earthquake with a magnitude of 6.3. The area most heavily affected by the earthquake was Kapanewon Pleret. The average shear wave velocity to a depth of 30 m (Vs30) is an important criterion in determining soil type classification. One geophysical method for determining Vs30 is the Multichannel Analysis of Surface Wave (MASW) method. The results of research in Kapanewon Pleret using the MASW method show that the Vs30 value in Kapanewon Pleret, Bantul Regency, is in the range of 212 – 396 m/s. Based on the Vs30 value that has been obtained, it can be classified that the soil types in Kapanewon Pleret, Bantul Regency, are dominated by medium soil (SD), and a small portion of very dense soil (SC).
Analisis Indeks Kerentanan Seismik di Desa Kalongan, Kecamatan Ungaran Timur, Kabupaten Semarang Menggunakan Metode Horizontal to Vertical Spectral Ratio Mentari, Nur faqhina mentari; Susanti, Dwi Budi
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
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Research has been conducted on the seismic vulnerability index (Kg) in Kalongan Village, East Ungaran District, Semarang Regency. This study used the Horizontal to Vertical Spectral Ratio (HVSR) method. The purpose of this study is to determine the dominant frequency value (f0), amplification factor (A0), and Kg and analyze the value of the seismic vulnerability index based on data acquisition in Kalongan Village, East Ungaran District, Semarang Regency from June 1 to 4, 2023. Microtremor signals will be read through Geopsy software to obtain f0 and A0 values which will later be used to calculate Kg values in Ms. Excel. From the results of data processing, varying f0 values were obtained, which were between 0.5-11.9 Hz. Similar to f0 values, A0 and Kg values also varied, namely 1.6-3.8 and 0.5-18.8. Based on the contour map of the Kg index, Kalongan Village, East Ungaran District has a low to high vulnerability index.
Identifikasi Litologi dan Pergerakan Tanah Menggunakan Metode Mikrotremor Wilayah Barat di Desa Kalongan, Kecamatan Ungaran Timur, Kabupaten Semarang Jawa Tengah Indah Enggar Pratiwi; Handayani, Wuri
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
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Abstract

Landslides or often called land movements have occurred in Kalongan Village, East Ungaran District, Semarang Regency. This research uses the microtremor method for the purpose of determining the dominant frequency (f0), amplification (A0), seismic vulnerability index (Kg), and subsurface lithology analysis based on shear wave velocity (Vs) values in Kalongan Village, East Ungaran District. In the area to be analyzed (to the west) there are two formations, namely the Kerek Formation and the Kaligetas Formation. The research results provide information about areas in Kalongan Village that have seismic vulnerability values (Kg) which have the potential to experience damage if ground movement occurs, such as at the KL 59 location which has soft soil with sedimentary rock lithology which is very vulnerable to earthquakes. The lithology of Kalongan Village as a whole consists of layers of Tuffan Sandstone, interbedded Claystone, Conglomerate in the Kerek Formation and Volcanic Breccia in the Kaligetas Formation.
PENGGUNAAN SOTWARE GMT 6 DAN PYTHON UNTUK MENAMPILKAN PETA SEISMISITAS DAN MENGHITUNG BESAR SUDUT SUBDUKSI DIPULAU JAWA TAHUN 2021 Maulina Putri Lestari; Budiarta, Budiarta; Perdana, Yusuf Hadi
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
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Abstract

Mapping the seismicity of an area, especially in subduction areas which are prone to earthquakes such as Java, is needed in order to prove the existence of natural activities in the form of plate shifts and identify faults and lead people to be aware of possible disasters in the same area. In this context, research was carried out with the aim of making seismicity maps, cross sections, and focal mechanisms in the Java region using GMT 6 software and using the PYTHON programming language and script processing software in the form of ANACONDA. Then, area slices were made and subduction angles were calculated for each slice segment. The data used in this study is secondary data sourced from the BMKG and USGS with the data collection range from January to December 2021. The area taken is at coordinates 10.99° LS – 5.50° LS and 105.100° E – 115.145° E. Based on the analysis results obtained on the cross section map, there is evidence that in Java this is a plate subduction path marked by a decrease in the hypocenter of the earthquake. The mapped focal mechanism shows that the Java area is dominated by thrust faults. Earthquakes that occur very often are those with a small magnitude category, namely on a scale of 3-5 with a shallow depth of around 0-60 km. Plate shifts show that the steeper the plate, the older the subduction angle. The size of the angle according to BMKG data for 2021 for each slice segment is segment A-A' 75.7° – 80.1°, B-B' 80.8° – 82.7°, C-C' 69.8 ° – 75.2°, and D-D' 80.6° – 82.9°
Mikrozonasi Indeks Kerentanan Seismik Menggunakan Metode HVSR di Kapanewon Galur, Kabupaten Kulon Progo Kalyana Mita, Ailing; Sunardi, Bambang; Mardiyanto
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
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Abstract

Kapanewon Galur in Kulon Progo is close to the Progo Fault, a fault with signs of activity about 35 km long. This area is included in a seismically active area because it is close to plate subduction activity, making it prone to earthquakes. This condition makes Kapanewon Galur an area that has the potential to experience earthquakes. The longer existence of the Progo Fault compared to the Opak Fault indicates a greater risk, allowing larger and more destructive earthquakes to occur in the future, compared to the 2006 earthquake in Bantul. Obtaining the dominant frequency (f0) and amplification factor (A0) values using the HVSR method helps to see the seismic vulnerability index (Kg) in the area. The microzonation of the area is also an important criterion for identifying earthquake-prone areas in the Kapanewon Galur area. Findings from research in Kapanewon Galur using the HVSR method show that the f0 ranges from 0.15 to 1.57 Hz, A0 value ranges from 1.24 to 3.61, and Kg ranges from 4.8 to 87.85. By considering these values, it can be concluded that Kapanewon Galur can be classified as an area with a high seismic vulnerability index.

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