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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
 1   2   3 
Pemanfaatan Fatiando a Terra untuk Analisis Data Gravitasi GGMplus berbasis Pustaka Python Amelia, Tri; Sunardi, Bambang; Mardiyanto; 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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The gravity method is one of the methods that can be used for regional geological studies according to differences in rock density due to variations in the Earth's gravitational field. Gravity data is not limited to field data but can also use satellite data such as GGMplus. The interpretation of gravity data in this paper is based on the results of regional anomalies and residual anomalies in the research area. Initially, the data was processed using the python verde, harmonica, boule, and pooch libraries by Fatiando a terra. The results of processing GGMplus gravity data using the python library by Fatiando a Terra indicate regional anomaly values ranging from 60 mGal to 130 mGal whereas the residual anomaly is between -30 mGal to 30 mGal. Synchronization between the position of positive and negative values of the residual anomaly and the fault coordinates coincide so that the faults in the Special Region of Yogyakarta are identified.
Analisis Perbandingan Waktu Peluruhan Gempa Bumi Menggunakan Metode Omori dan Mogi 1 dengan Software Peluruhan V2.0 Saefurohmah, Mufti; Susanti, Dwi Budi; Effendi, Mukhtar
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
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Jumlah kejadian gempa dalam kurun waktu tertentu yang menggambarkan tingkat keaktifan seismik atau kegempaan suatu wilayah menjadi urgensi yang harus diketahui rentang waktunya. Hal ini dikarenakan aktivitas kegempaan bukan hanya kejadian sekali namun seringkali diikuti gempa susulan sehingga diperlukan penelitian yang bertujuan untuk mengetahui lama waktu yang diperlukan untuk mencapai kestabilan setelah pelepasan energi gempa. Pada penelitian ini mengambil kasus Gempa Bantul 30 Juni 2023 M 6.0. Metode yang digunakan adalah metode Omori dan metode Mogi I melalui pengaplikasian konsep regresi  linear sederhana pada software peluruhan v2.0. Data yang digunakan adalah data gempa bumi Bantul pada bulan Juni-Juli 2023 yang diperoleh dari Seiscomp4. Data tersebut diolah dalam Microsoft Excell, diselesaikan dengan konsep regresi linear sederhana, dan ditampilkan dengan grafik pada software peluruhan v2.0. Hasil menujukkan koefisien regresi dari metode omori sebesar 0,476 dengan waktu peluruhan selama 18 hari setelah gempa utama terjadi, sedangkan dari metode Mogi I didapatkan koefisien regresi sebesar -0,797 dengan waktu peluruhan selama 36 hari setelah gempa utama terjadi. Data tersebut merupakan data kalkulasi. Dari kedua metode tersebut, metode Mogi 1 dinilai lebih akurat untuk menentukkan waktu berakhirnya gempa susulan karena taksirannya lebih mendekati data observasi yang menunjukkan waktu peluruhan gempa selama 32 hari.
Analisis Mikrotremor Berbasis Metode HVSR Untuk Mengetahui Indeks Kerentanan Seismik Di Wilayah Kabupaten Kulonprogo Yogaswara, Azriel Raditya Decca; Kuncahyani, Arin
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
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Pada wilayah Kabupaten Kulon Progo bertepatan dengan adanya Sesar Progo, suatu sesar dengan tanda-tanda aktivitas sepanjang sekitar 35 km. Daerah ini termasuk dalam kawasan aktif seismik karena berdekatan dengan aktivitas subduksi lempeng, membuatnya rawan gempa bumi. Kondisi ini menjadikan Kulon Progo sebagai daerah yang berpotensi mengalami gempa bumi. Keberadaan Sesar Progo yang lebih panjang dibandingkan dengan Sesar Opak menunjukkan risiko lebih besar, memungkinkan terjadinya gempa bumi yang lebih besar dan merusak di masa depan, dibandingkan dengan peristiwa gempa tahun 2006 di Bantul. Mendapatkan nilai faktor amplifikasi (A0) dan frekuensi dominan (f0) menggunakan metode HVSR membantu untuk melihat indeks kerentanan seismik (Kg) di daerah tersebut. Temuan dari penelitian di wilayah Kabupaten Kulon Progo dengan menggunakan metode HVSR menunjukkan bahwa nilai faktor amplifikasi memiliki rentang nilai antara 1,4 sampai 6,2 dan nilai indeks kerentanan seismik 0,4 – 22,4, dimana daerah dengan kerentanan seismik yang tertinggi terlihat berada di sekitar titik TA72 yaitu sebesar 22,4 yang merupakan daerah wilayah Jatirejo Kecamatan Lendah.
Analisis Percepatan Tanah Maksimum Menggunakan Metode Donovan dan MC Guirre (Studi Kasus Gempabumi Bantul 30 Juni 2023) Safitri, Maylialfinatun; Susanti, Dwi Budi; Handayani, Wuri
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
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Pada praktik kerja lapangan ini telah dilakukan pengolahan data percepatan tanah maksimum menggunakan metode Donovan dan MC Guirre di daerah Kabupaten Bantul berdasarkan data gempa 30 Juni 2023 yang didapatkan dari SeiscomP3. Penelitian ini bertujuan untuk mengetahui nilai percepatan tanah maksimum wilayah Bantul berdasarkan kedua metode tersebut, menganalisis peta kontur nilai percepatan tanah maksimum dari setiap metode, dan mengetahui hubungan nilai percepatan tanah maksimum dengan skala Modified Mercalli Intensity (MMI). Hasil pengolahan data menunjukkan nila percepatan tanah maksimum metode Donovan berkisar antara 36,99 gal hingga 43,06 gal sedangkan metode MC Guirre diperoleh nilai percepatan tanah maksimum berkisar antara 38,80 gal sampai dengan 45,18 gal. Nilai percepatan tanah maksimum menggunakan metode MC Guirre lebih tinggi dibandingkan metode Donovan. Nilai ini mempengaruhi warna pada kontur, daerah yang berwarna merah menunjukkan nilai percepatan tanah maksimum tertinggi lebih banyak ditunjukkan dengan metode MC Guirre dibandingkan metode Donovan. Berdasarkan hubungan percepatan tanah maksimum dengan skala MMI didapatkan nilai klasifikasi skala MMI III-V untuk kedua metode.
Analisis Waktu Berakhirnya Gempa Bumi Susulan Menggunakan Metode Mogi II dan Utsu (Studi Kasus Gempa Bumi Bantul 30 Juni 2023) Erni Asanti; Susanti, Dwi Budi; Pulo Boli, Lusia Silfia
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
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An earthquake with a large magnitude, such as the Bantul earthquake on June 30, 2023, has the potential to trigger aftershocks. This study aims to determine the time required to reach the stability of energy release from the earthquake, compare the decay of aftershocks using the Mogi II and Utsu methods, and identify the most accurate method for predicting the end of aftershocks based on observational data. The data used are recordings of the Bantul earthquake from SeisComP4, which were then analyzed using the equations of each method. The analysis results show differences in the end time of aftershocks (t) and correlation coefficients (r) between the two methods. The Utsu method indicates the end of aftershocks on August 4, 2023, with a correlation coefficient close to -1, indicating strong interpretation, while the Mogi II method estimates the end of aftershocks on July 29, 2023. The Utsu method is closer to the observational results, which show that the aftershocks ended on the 32nd day after the main earthquake, on July 31, 2023.
Analisis Perbandingan Nilai Peak Ground Acceleration (PGA) Dengan Metode Esteva dan Oliviera (Studi Kasus : Gempa Bumi Bantul 30 Juni 2023) Utami, Rizky Widya; Pratiwi, Umi; Susanti, Dwi Budi; Handayani, Wuri
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
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This study aims to calculate and compare the peak ground acceleration (PGA) values using the Esteva and Oliviera methods, analyze the differences in patterns and values on the contour maps produced by both methods and correlate the PGA values with the Modified Mercalli Intensity (MMI) scale. The case study focuses on the earthquake in Bantul on June 30, 2023, with earthquake data obtained from BMKG. The data were processed using the equations of each method to generate PGA contour maps. The results show that the PGA values calculated using the Esteva method range from 5.47 to 6.73 gal, while the Oliviera method produced higher values, ranging from 9.64 to 12.14 gal. The contour maps of both methods exhibit similar distribution patterns but significant value differences. The Oliviera method's contour map shows higher PGA values than the Esteva method. The results from both methods align with the BMKG earthquake intensity map for the June 30, 2023 event, indicating perceived earthquake intensity at levels III-V MMI. This study demonstrates that the Esteva and Oliviera methods can map PGA distribution, albeit with different sensitivities.  
Analisis Peak Ground Acceleration Kabupaten Bantul Menggunakan Metode Campbell dan Oliviera (Studi Kasus Gempa Bumi Bantul 30 Juni 2023) Melda Gian Priyanita; Darsono, Darsono; Handayani, Wuri
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
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The earthquake on June 30, 2023, centered in the southwest sea of Bantul The earthquake that occurred on June 30, 2023, with its epicenter located southwest of Bantul Regency, was one of the destructive earthquakes in Yogyakarta. One of the objectives of this study is to determine the most suitable empirical formula method for Bantul Regency in calculating the Peak Ground Acceleration (PGA) in the form of distribution maps and bar charts. The PGA value provides an indication of the level of building damage caused by the earthquake. This study conducted the PGA calculations using Campbell and Oliveira's empirical formula methods. Earthquake data were obtained from Shakemap released by BMKG. Based on the analysis, the Campbell method yielded PGA values with an MMI scale ranging from II to IV, while the Oliveira method resulted in an MMI scale ranging from II to III. The villages in Bantul Regency with the highest PGA values for each method are Parangtritis, Tirtohargo, Gadingsari, Gadingharjo, Srigading, and Poncosari.
Analisis Kerentanan Tanah di Selatan Zona Longsor Desa Kalongan, Kabupaten Semarang Menggunakan Metode Horizontal to Vertical Spectral Ratio (HVSR) Helena, Nahda Helena Sekarsari; Wuri Handayani
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 2 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Desember 2024
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The Semarang Regency, despite being far from the subduction zone in the southern part of Java Island, still faces the threat of landslides. One of the vulnerable areas is Kalongan Village, East Ungaran Sub-district, which experienced a significant landslide in 2022. The high potential for damage in residential areas underscores the need for a soil vulnerability analysis based on geophysical parameters. This study employs the microtremor method with Horizontal to Vertical Spectral Ratio (HVSR) analysis to determine dominant frequency, amplification factor, and seismic vulnerability index parameters. Data processing was conducted using Geopsy software, resulting in 2D and 3D contour maps. The results indicate that the dominant frequency in this area is low (<2.5 Hz), suggesting the presence of soft soil layers with sediment thickness exceeding 30 meters. The amplification factor mostly ranges between 1 and 3.5, with some points reaching 6, indicating a high potential for ground motion amplification. The seismic vulnerability index varies from 1 to 17, with the highest values in densely populated residential areas in the southern part of the study zone. Kalongan Village exhibits a high level of soil vulnerability, especially in areas with high amplification and seismic vulnerability index values. These findings can serve as a basis for developing landslide disaster mitigation strategies, including safer land use planning for the community.
Mikrozonasi Frekuensi Dominan (F0) dan Faktor Amplifikasi (A0) Di Desa Pacarejo Bagian Barat, Semanu, Gunungkidul, Yogyakarta SALSABIILA ANINDYA NOOR CANDRANINGTYAS; Susanti, Dwi Budi
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 2 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Desember 2024
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Yogyakarta is a region with high seismic activity influenced by the interaction of the Indo-Australian and Eurasian plates and the presence of local faults. One of the areas significantly affected is Pacarejo Village, Semanu District, Gunungkidul, which experienced damage from the June 30, 2023 earthquake with a magnitude of M6.0. This study aims to conduct microzonation of predominant frequency (f0) and amplification factor (A0) in the area using the Horizontal to Vertical Spectral Ratio (HVSR) method based on microtremor analysis as an earthquake disaster mitigation effort. A total of 19 measurement points were conducted to determine the f0 and A0 values. The analysis results indicate that f0 values range from 1.46 to 11.04 Hz, with higher values in the southern part of the study area, reflecting hard and thin rock layers. In contrast, lower values indicate thick and soft sediment layers. The A0 values range from 1.07 to 3.4, predominantly classified as low to moderate. The highest A0 value was found near earthquake-affected houses, reflecting the interaction between soil characteristics and seismic wave amplification. The resulting microzonation maps of predominant frequency and amplification factor provide an overview of the area's seismic characteristics. These findings are expected to serve as a basis for earthquake disaster mitigation in Pacarejo and its surroundings and support safer and more sustainable development planning.
Identifikasi Kawasan Rawan Longsor di Banjarsari, Purwoharjo, Kulon Progo Menggunakan Metode HVSR dan Vs30 Sunardi, Bambang; Kartiko, Ilham Bayu
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 2 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Desember 2024
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Landslides are processes involving the downward movement of material, such as rocks or soil, influenced by topographical, geological, and soil characteristics. The Banjarsari, Purwoharjo areas have been identified as having a high potential for landslide hazards due to their diverse and vulnerable soil conditions. This study utilized microtremor data analyzed using the HVSR and Vs30 methods to conduct microzonation to identify areas with a high potential for landslides. Key parameters analyzed include dominant frequency (f0), amplification (A0), seismic vulnerability index (Kg), peak ground acceleration (PGA), average shear wave velocity (Vs30), ground shear strain (GSS), and slope gradient. The analysis also involved a comparison of the Vs30 values obtained in this study with the USGS reference values. The microzonation results indicate that locations 2, 3, and 4 have the highest landslide vulnerability levels compared to other areas. These findings provide a critical basis for landslide disaster mitigation planning in the Banjarsari, Purwoharjo regions and serve as a reference for geophysics-based disaster risk management.

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