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All Journal Jurnal Fisika Unand Jurnal Dampak SEMIRATA 2015 Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) Jurnal Ilmu Fisika INTEGRITAS : Jurnal Pengabdian BERNAS: Jurnal Pengabdian Kepada Masyarakat Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Indonesian Journal of Community Empowerment and Service
Dwi Pujiastuti
Jurusan Fisika FMIPA Universitas Andalas
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Analisis Deformasi di sekitar Sesar Cimandiri Akibat Gempa Cianjur 2022 Menggunakan Data Indonesia Continuously Operating Reference Station Fery Kurnia Sandi; Dwi Pujiastuti; Marzuki Marzuki; Vira Friska
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.504-510.2024

Abstract

The preseismic and coseismic deformation due to the 21st November Cianjur Earthquake with a magnitude of 5.6 Mw has been analyzed. This study uses Global Navigation Satellite Station (GNSS) data and 13 Indonesian Continuously Operating Reference Station (InaCORS) daily displacement data to reveal the source of the 21 November 2022 Cianjur earthquake. The InaCORS stations used include BAKO, CANG, CBTU, CJKT, CJUR, CLBG, CLDO, CPTN, CPWK, CROL, CSUM, and CUMI. This research uses GLOBK/GAMIT software and is interpreted in a deformation map. From the data processing results, the deformation pattern of station shifts in the pre-earthquake phase indicates that the movement of the Cimandiri Fault did not cause the 21 November 2022 Cianjur earthquake but was likely caused by a new fault. This is indicated by the difference between the deformation direction of the InaCORS station close to the epicenter and the direction of the Cimandiri Fault movement. The most significant horizontal coseismic deformation was obtained at 43.86 mm at CJUR station, with deformation towards the southeast. The most significant vertical coseismic deformation (uplift) was obtained at 25.9 mm at the CLDO station. 
Penentuan Potensi Cadangan Batu Andesit Menggunakan Metode Geolistrik Tahanan Jenis di Koto Alam, Kabupaten Lima Puluh Kota Mayola Fariza; Dwi Pujiastuti
Jurnal Fisika Unand Vol 13 No 3 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.3.420-426.2024

Abstract

Telah dilakukan penelitian untuk menentukan potensi cadangan batu andesit di Koto Alam, Kabupaten Lima Puluh Kota menggunakan metode geolistrik tahanan jenis dua dimensi konfigurasi Wenner-Schlumberger. Pengukuran dilakukan pada 2 lintasan dengan bentangan 100 meter dan jarak antar elektroda 5 meter. Lintasan 1 terletak pada koordinat 0°00’14.10”LS dan 100°44’54.46”BT sampai 0°00’12.90”LS dan 100°44’56.41”BT. Lintasan 2 terletak pada koordinat  0°00’14.16”LS dan 100°44’57.66”BT sampai 0°00’13.02”LS dan 100°44’59.47”BT. Daerah penelitian ini merupakan daerah dengan kondisi geografis berlereng atau perbukitan dengan tinggi lereng adalah 13 m dan sudut kemiringan lereng 85°. Lintasan 1 berada pada ketinggian 293 mdpl dan Lintasan 2 berada pada ketinggian 300 mdpl. Data hasil pengukuran diolah dengan menggunakan software Res2Dinv. Berdasarkan hasil inversi disimpulkan bahwa di bawah permukaan teridentifikasi adanya lapisan  batu andesit. Dari hasil penelitian diestimasikan pada Lintasan 1 terdapat cadangan batu andesit di kedalaman 1,25 sampai 19,8 meter dengan nilai tahanan jenis berkisar dari 890 sampai 2322 Ωm serta ketebalan 18 meter. Lintasan 2 lapisan batu andesit berada pada kedalaman 1,25 sampai 12,4 meter dengan nilai tahanan jenis berkisar dari 170 sampai 9249 Ωm serta ketebalan 11 meter.
Studi Bahaya Seismik dengan Metode PSHA (Probabilistic Seismic Hazard Analysis) di Nusa Tenggara Barat Menggunakan Data Gempa Tahun 1900 - 2023 Nadya Rezky Ananda; Dwi Pujiastuti
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.665-670.2024

Abstract

Research has been conducted on earthquake hazard in West Nusa Tenggara using the Probabilistic Seismic Hazard Analysis (PSHA) method. Earthquake data from 1900 2023 were obtained from the United States Geological Survey (USGS) catalog. PSHA uses earthquake parameters that produce maximum ground acceleration (PGA). The PGA value is calculated using an attenuation function based on the earthquake source. The results of the analysis show that for West Nusa Tenggara, the maximum PGA is 0,65 g with a 10% return event probability in 50 years and 0,71 g with a 2% return event probability in 50 years. Areas with high earthquake risk with 2% and 10% return event probability in 50 years are Sumbawa with PGA ranges of 0,26-0,68 g and 0,18 0,26 g and Lombok with PGA ranges of 0,26-0,47 g and 0,26-0,42 g, respectively. Areas with the lowest to moderate earthquake risk with a probability of re-occurrence of 2% and 10% in 50 years are Bima with a PGA of 0,37 g and 0,26 g, Badjo with a PGA range of 0,37-0,47 g and 0,26 g, and Kore with a PGA range of 0,26-0,37 g and 0,18-0,26 g, respectively. Based on the PGA values obtained, Sumbawa is an area that has the greatest level of earthquake risk due to its location close to the subduction zone.
Analisis Parameter Seismisitas a-Value dan b-Value serta Percepatan Tanah Maksimum (PGA) Sebelum dan Sesudah Gempa Ambon 2019 Menggunakan Metode Probabilistic Seismic Hazard Analysis (PSHA) Indah Putri Utami; Dwi Pujiastuti
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.813-819.2024

Abstract

Probabilistic Seismic Hazard Analysis (PSHA) is a method to estimate earthquake risk in a region by considering uncertainties in earthquake sources and local ground response. To estimate earthquake risk and seismic impacts in a region, an in-depth analysis of seismicity parameters, such as a-value and b-value, as well as maximum ground acceleration (PGA), is required. This study aims to analyze changes in seismicity parameters, particularly b-value (rock fragility) and a-value (seismicity index) in the Maluku region before and after the 2019 Ambon earthquake. This study also aims to see whether there are changes in Peak Ground Acceleration (PGA) values for the Maluku region after the 2019 Ambon Earthquake. The seismic data used in this study comes from the USGS catalogue recorded from 2000 to 2022. The results of this study show that the b-Value of the Maluku region as a whole before the earthquake was 1.15 and decreased to 0.91 after the 2019 Ambon earthquake. However, the a-Value and b-Value for each seismic source zone increased. In addition, the PGA value for the Maluku region is 1.25g. These results provide the conclusion that the Maluku region is included in the zone with medium seismic hazard with the level of earthquake damage included in category VI of the MMI scale.
Education of Disaster Awareness through Disaster Readiness Socialization as an Effort to Increase Community Knowledge around the Nobita Hill Tourism Area on Disaster Mitigation Marzuki Marzuki; Mutya Vonnisa; Harmadi Harmadi; Dwi Pujiastuti; Arif Budiman; Dwi Puryanti; Sri Oktamuliani; Imam Taufiq; Meqorry Yusfi; Rahmat Rasyid; Astuti Astuti; Sri Handani; Sri Rahayu Alfitri Usna; Dian Fitriyani; Elvaswer Elvaswer; Muhammad Arif; Muhammad Kahfi; Naela Amalia Zulfa; Iqbal Ramadhan; Nurul Hasanah; Feriska Handayani Irka
Warta Pengabdian Andalas Vol 31 No 2 (2024)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.31.2.353-361.2024

Abstract

Nobita Hill, a tourist site in Padang City, is undergoing development as a tourist destination that offers a bird's-eye view of Padang City. Unfortunately, the hilly topography with steep slopes increases the risk of landslides in this area. In order to address the problem, the community service team from the Physics Department of Andalas University has carried out a six-month community service program from July to December 2022. It focused on disaster awareness education and used a qualitative approach. This activity aims to socialize disaster mitigation efforts, especially those related to landslides and earthquakes, considering that Padang City is also prone to earthquakes. The results of this activity showed an increase in the knowledge of the local community after the socialization, but repeated activities are needed to achieve optimal results. This ongoing activity is essential to ensure continuous improvement in the community's understanding of disaster mitigation and to support efforts to make Bukit Nobita a disaster-resilient area. Thus, this activity makes a positive contribution to shaping a safe, sustainable, and disaster-resilient tourism environment.
Indonesia IDENTIFIKASI PERCEPATAN TANAH MAKSIMUM MENGGUNAKAN METODE MIKROTREMOR DI KOTA PADANG Illona giovanni, Vannessa; Pujiastuti, Dwi; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.1-7.2025

Abstract

The position of Padang City on the coast and close to the subduction zone makes it very vulnerable to the impact of earthquakes, therefore mitigation efforts against potential disasters are very important to reduce the risk of such events. This study was conducted to map ground acceleration using the microtremor method as one of the efforts in earthquake disaster mitigation. The calculation of the maximum ground acceleration (PGA) value uses dominant frequency data (f0), amplification factor (A0 ) and soil vulnerability (kg) as input data obtained from microtremor data analysis using the Horizontal to vertical spectral ratio (HVSR) method. The microtremor data processed were 33 measurement points in 11 sub-districts in Padang City with a distance between points of 1-5 km. The dominant frequency, amplification, vulnerability and maximum ground acceleration values were then mapped to determine areas prone to earthquake disasters. Areas of Padang City with a high level of vulnerability can be seen in Bungus Teluk Kabung District and Padang Barat District.
Co-Authors Adrial, Rico Afdal Afdal Afdal Afdal Afdal, Afdal Afdhal Muttaqin Afrizal Afrizal Ahmad Fauzi Pohan Ahmad Furqan Alifvia Daswita Alimin Mahyudin Andiyansyah Sabarani Andiyansyah Z Sabarani Annisa Zahratul Hilma Annisa Zahratul Hilma Ardian Putra Ardian Putra Ardian Putra Ari Febriana Kabisat Arif Budiman Arif Budiman Ariqah Ardelia Arisa, Deasy Asep Firman Ilahi Astuti Astuti - Astuti Astuti Astuti Astuti Atin Nur Aulia Atin Nur Aulia Aulia Latifah Aulya Rahayu Badrul Mustafa Badrul Mustafa, Badrul Br. Sitanggang, Regina Mai Anggriani Dahyunir Dahlan Damayanti, Elok Daz Edwiza, Daz Deasy Arisa Deasy Arisa Deasy Arisa Dedi Mardiansyah Denisa Syafriana Desi Indriani Dian Fitriyani Dian Fitriyani Dian Milvita Diana Saputri Dika Aprilia Susanti Dimas Pramudito Dwi Puryanti Ednofri - Ednofri - Ednofri Ednofri, Ednofri Edwards Taufiqurrahman, Edwards Ekarama Putri Eldiani Arifya Elistia Liza Namigo, Elistia Elvaswer Elvaswer Fadilla Monica Fadilla Monica Feriska Handayani Irka, Feriska Handayani Fery Kurnia Sandi Fhatihatul Rahmi Fitri Gustiana Fitri Gustiana Friska Puji Lestari Gustiana, Fitri Hamdy Arifin Hamdy Arifin Hamdy Arifin, Hamdy Hanif Hidayat Harmadi Harmadi Herifa - Hilma, Annisa Zahratul Ikhwan Safrima Illona giovanni, Vannessa Imam Taufik Imam Taufiq Indah Putri Utami Indri Septiani Iqbal Ramadhan Irma Kurniawati Jarnal Witarsa Koko Ondara Lina Handayani Lusi Fitrian Sani Luthfia Hafizhah M. Arif Mairisdawenti - Marlisa Marlisa Marzuki Marzuki Marzuki Marzuki Maya Minangsih Maya Minangsih Mayang Putri Andini Mayola Fariza Meqorry Yusfi Minangsih, Maya Mochammad Imron Awalludin Mohammad Ali Shafii Mora Mora Muhamad Rizki Agfustian Muhammad Arif Muhammad Kahfi Muhammad Razi Muhammad Ridho Amirudin Muldarisnur, Mulda Mutya Vonnisa Nadila Syarah Nadya Rezky Ananda Naela Amalia Zulfa Nini Firmawati Nofaslah, Rido Novia Anggraini Novia Dwi Agusri Nurdin Nurdin Nurul Annisa Nurul Hasanah Okci Mardoli Rachmad Billyanto Rachmad Billyanto Rachmad Billyanto Rahma Fidia Rahmad Aperus Rahmad Aperus Rahmad Baihaqi Rahmat Rasyid Rahmi Nanda Pertiwi Ramacos Fardela Regina Mai Anggriani Regina Mai Anggriani Br. Sitanggang Rido Nofaslah Rido Nofaslah Rika Desrina Saragih Rika Desrina Saragih Riska Wulan Dari Rita Ummi Sahida Tanjung Rohadatul Aisy Syafda Solly Aryza Sri Handani Sri Oktamuliani Sri Wahyuni Sucy Lestari Wirma Sumi Daniati, Sumi Titi Anggono Toni Widianto Trengginas Eka Putra Sutantyo Trevi Jayanti Puspasari Usna, Sri Rahayu Alfitri Velli Shinta Violina Oktaviani Vira Friska Wendi Harjupa Widi Satria Indriani Wildan Hafni Wiwit Reflidawati Yoci Darwita Putri Yoci Darwita Putri Yudi Darma Zulfi Zulfi Abdullah