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All Journal Jurnal Stasiun Geofisika Sleman (JSGS) Sunan Kalijaga Journal of Physics
Susanti, Dwi Budi
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Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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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
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

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 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
Publisher : Stasiun Geofisika Kelas I Sleman

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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
Publisher : Stasiun Geofisika Kelas I Sleman

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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
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

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.  
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
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

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.
Jurnal Analisis Kesesuaian Lahan Permukiman pada Daerah Tidak Rawan Bencana Gempa Bumi di Kabupaten Bantul Nuraini, Risna Wahyu; Khoirunisa, Wafiq; Susanti, Dwi Budi; Handayani, Wuri
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 2 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Desember 2024
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Kabupaten Bantul terletak di zona seismik aktif, di mana pergeseran lempeng tektonik sering menyebabkan gempa bumi. Kesesuaian lahan permukiman sangat mempengaruhi besaran dampak bencana gempa bumi bagi masyarakat. Penelitian ini menggunakan Analytical Hierarchy Process (AHP) dan Sistem Informasi Geografis (SIG). dengan teknik skoring dan overlay. AHP digunakan untuk pembobotan tiap parameter dalam pengambilan keputusan, sementara SIG berperan penting dalam menganalisis dan mengevaluasi kesesuaian lahan berdasarkan parameter yang ditentukan. Berdasarkan analisis AHP yang dilakukan, didapatkan nilai pengaruh untuk tiap parameter: 63.72% kemiringan lereng, 14.12% kerawanan gempa bumi, 9.63% jarak kedekatan terhadap sesar Kali Opak, 7.93% jenis tanah, dan 4.59% intensitas curah hujan. Hasil overlay peta klasifikasi dari skoring tiap parameter menunjukkan kesesuaian lahan permukiman di Kabupaten Bantul terbagi atas empat kelas yakni tinggi, sedang, rendah, dan sangat rendah.
Earthquake Hazard Analysis in Probolinggo Region as a Mitigation Effort Using Probabilistic Seismic Hazard Analysis Method: Analisis Bahaya Gempa Bumi Di Wilayah Probolinggo Sebagai Upaya Mitigasi Menggunakan Metode Probabilistic Seismic Hazard Analysis Al Ghifari, Muhammad Taufiq Akbar; Sunardi, Bambang; Susanti, Dwi Budi; Handayani, Wuri
Sunan Kalijaga Journal of Physics Vol. 6 No. 1 (2024): Sunan Kalijaga Journal of Physics
Publisher : Prodi Fisika Fakultas Sains dan Teknologi UIN Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/physics.v6i1.5153

Abstract

Probolinggo is one of the areas traversed by an active fault, namely the Probolinggo Fault. As an area that is prone to earthquake disasters, Probolinggo needs to have an earthquake hazard modeling as a mitigation effort to minimize the impact of an earthquake that occurs in the future. Earthquake hazard modeling is a multidisciplinary science that aims to predict earthquakes, and the ground shaking they produce. One method that can be used is Probabilistic Seismic Hazard Analysis (PSHA). This study aims to analyze the earthquake hazard in Probolinggo area using the PSHA method as an effort to mitigate earthquake prone areas. The data used is historical earthquake data from the Agency for Meteorology, Climatology, and Geophysics (BMKG) for the 1973-2020 period with a magnitude of Mw ≥ 5, a depth of 0-300 km, and a radius of 300 km from the study area. The earthquake source model used includes megathrust, faults, and background earthquake sources. Three sets of Ground Motion Prediction Equation (GMPE) were used for each earthquake source. PSHA was performed for the condition of a 2% probability of being exceeded in 50 years. The average shear wave velocity to a depth of 30 m (Vs30) from the United States Geological Survey (USGS) were used to model the peak ground acceleration on the surface. The results showed that the peak ground acceleration (PGA) at bedrock ranged from 0.27 to 0.71 g. PGA at the surface (PGAM) ranges from 0.27 to 0.83 g. The distribution of the amplification value in Probolinggo area is 1.02 to 1.12. The earthquake hazard analysis obtained shows that the northern part of the Probolinggo area has a higher earthquake hazard than the southern part. The results of the study can be used as consideration in regional development based on earthquake risk reduction.
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)
Publisher : Stasiun Geofisika Kelas I Sleman

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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.
Co-Authors Al Ghifari, Muhammad Taufiq Akbar Bambang Sunardi, Bambang Erni Asanti Khoirunisa, Wafiq Mentari, Nur faqhina mentari Mukhtar Effendi Nuraini, Risna Wahyu Pulo Boli, Lusia Silfia Saefurohmah, Mufti Safitri, Maylialfinatun SALSABIILA ANINDYA NOOR CANDRANINGTYAS Umi Pratiwi, Umi Utami, Rizky Widya Wuri Handayani