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All Journal JURNAL PENELITIAN ILMU PENDIDIKAN 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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Pemodelan Anomali Magnetik Untuk Identifikasi Struktur Bawah Permukaan Bumi Di Nagari Cupak Kabupaten Solok Ahmad Furqan; Dwi Pujiastuti; Dwi Puryanti; Ardian Putra
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.13.4.476-482.2024

Abstract

This research was conducted to determine the distribution of magnetic anomalies in the geothermal area of Nagari Cupak, Solok Regency using geomagnetic methods. Data was collected using a magnetometer at 144 observation points with a distance of 300 m between points. The magnetic anomaly value is obtained from the correction of daily variation’s total magnetic data and correction to the magnetic field value of the 13th generation IGRF (International Geomagnetic Reference Field) reference model. Furthermore, reduction to the poles and continuation upwards with a height of 200 m are carried out to remove noise and separate local and regional magnetic anomalies. After data processing, the total magnetic anomaly value in the area ranges from 1252.8 nT to 2969.4 nT which is categorized as low. The low anomaly value is thought to be caused by the demagnetization of rocks due to the influence of geothermal sources in the subsurface. Furthermore, 2D modeling is carried out by analyzing the magnetic anomaly data and making a cross-sectional incision of the model on the contour of the magnetic field anomaly that has been processed above. Based on the modeling results, the subsurface geothermal system of Nagari Cupak, Solok Regency, consists of a cover rock layer, reservoir layer, and hot rock layer which is suspected to be the heat source of the geothermal system of the study area.
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.
Analisis Anomali Ketinggian Semu Lapisan F Ionosfer (h'F) sebagai Prekursor Terjadinya Gempa Laut (Studi Kasus terhadap 2 Sampel Gempa Laut di Sumatera Barat) Saragih, Rika Desrina; Pujiastuti, Dwi; -, Ednofri
Jurnal Fisika Unand Vol 2 No 4: Oktober 2013
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.2.4.%p.2013

Abstract

Telah dilakukan analisis kualitatif untuk korelasi antara aktivitas seismik sebelum gempa besar (M ≥ 5 SR) dengan ketinggian semu lapisan F ionosfer (h’F) untuk 2 sampel gempa laut di Sumatera Barat.  Sampel gempa laut yang dipilih adalah gempa Pariaman (30 September 2009) dan  gempa Pesisir Selatan (07 Februari 2013).  Data ionosfer yang digunakan adalah ionogram yang diperoleh dari ionosonda Frequency Modulation Continous Wave (FMCW) di Lembaga Penerbangan dan Antariksa Nasional (LAPAN), Palupuh, Sumatera Barat.  Proses scaling ionogram untuk kedua gempa selama 7 hari sebelum gempa dilakukan dan diproses lebih lanjut untuk mendapatkan nilai variasi harian h’F.  Nilai variasi harian h’F kemudian dibandingkan dengan nilai mediannya untuk melihat anomali yang muncul.  Berdasarkan pada analisis yang dilakukan, ditemukan bahwa untuk kedua sampel gempa, prekursor mulai muncul pada saat 7 hari sebelum gempa.  Total munculnya prekursor untuk gempa Pariaman sebanyak 7 kali dan untuk gempa Pesisir Selatan sebanyak 2 kali.  Perbedaan tersebut kemungkinan disebabkan oleh perbedaan karakteristik dari kedua gempa.
KARAKTERISASI RESERVOIR BATUPASIR FORMASI KEUTAPANG MENGGUNAKAN ANALISIS AVO (AMPLITUDE VERSUS OFFSET) PADA STRUKTUR “X” SUMATERA BAGIAN UTARA Mardoli, Okci; Pujiastuti, Dwi; Edwiza, Daz; Kabisat, Ari Febriana
Jurnal Fisika Unand Vol 3 No 2: April 2014
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.3.2.74-83.2014

Abstract

ABSTRAKTelah dilakukan karakterisasi reservoir batupasir formasi Keutapang melalui analisis AVO (Amplitude Versus Offset) dengan software Hampson-Russel (HRS) pada struktur “X” Sumatera Bagian Utara. Reservoir batupasir dikarakterisasi menggunakan AVO Product, Scaled Poisson’s Ratio Change, Shear Reflectivity, dan Fluid Factor. Disamping itu dilakukan pembagian AVO berdasarkan analisis hasil crossplot. Analisis AVO dari hasil crossplot diperoleh dari hasil atribut AVO intercept dan gradient. Hasil menunjukkan bahwa reservoir formasi Keutapang yang berada pada zona 1275 di kedalaman 1250 meter mengindikasikan adanya kandungan gas. Dari hasil analisis didapatkan bahwa reservoir batupasir memiliki impedansi yang rendah seiring peningkatan AVO yang merupakan sifat dari AVO kelas III.Kata kunci: karakterisasi reservoir batupasir, Hampson-Russel, analisis AVO,  intercept, gradient, AVO kelas IIIAbstractReservoir of structure “X” of Keutapang formations in the northern part of Sumatera by AVO (Amplitude Versus Offset) analysis has been conducted. The data were processed by Hampson-Russel (HRS) software. The characterisation was based on AVO Product analysis, Scaled Poisson’s Ratio Change, Shear Reflectivity and the concept of AVO classification based on crossplot analysis. It was found that reservoir zone 1275 located at 1250 meters in depth of Keutapang formation has low impedance sandstone reservoir (AVO class III), which indicates the presence of gas deposits. Keywords : characterization sandstone reservoir, Hampson-Russel, AVO  analysis, gradient, intercept, AVO class III
ANALISIS PENGARUH INTENSITAS RADIASI MATAHARI, TEMPERATUR, DAN KELEMBABAN UDARA, TERHADAP FLUKTUASI KONSENTRASI OZON PERMUKAAN Di Bukit Kototabang Tahun 2005-2010 -, Mairisdawenti; Pujiastuti, Dwi; Ilahi, Asep Firman
Jurnal Fisika Unand Vol 3 No 3: Juli 2014
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.3.3.177-183.2014

Abstract

ABSTRAKTelah dilakukan analisis pengaruh intensitas radiasi matahari, temperatur, dan kelembaban udara terhadap fluktuasi konsentrasi ozon permukaan di Bukit Kototabang tahun 2005-2010 dengan metode regresi linier.  Hasil penelitian menunjukkan bahwa fluktuasi konsentrasi ozon rata-rata harian mengikuti pola rata-rata harian intensitas radiasi matahari, dan berbanding terbalik dengan kelembaban udara. Faktor meteorologi yang paling besar hubungannya dengan konsentrasi ozon berdasarkan analisis nilai regresi yaitu temperatur permukaan, dengan nilai koefisien determinasi R2=26,0 pada tahun 2010.Kata kunci : ozon permukaan, regresi linier, faktor meteorologiAbstractAnalysis effect of the intensity of solar radiation, temperature, and air humidity, tofluctuations in surface ozone concentrations in Bukit Kototabang with linear regression method from 2005 to 2010 has been conducted. The results showed that the fluctuations in ozone concentration daily average follows the pattern of average daily solar radiation intensity, and inversely proportional to the air humidity. The meteorological factors which have greatest correlation with the ozone concentration values based on regression analysis is surface temperature, with a coefficient of determination R2 = 26.0 in 2010. Keywords : surface ozone, linear regression , meteorological factors
Co-Authors - Afrizal Adrial, Rico Afdal Afdal Afdal Afdal Afdal Afdal, Afdal Afdal, Afdal Afdhal Muttaqin Afrizal Afrizal Agfustian, Muhamad Rizki Ahmad Fauzi Pohan Ahmad Furqan Alifvia Daswita Alimin Mahyudin Amirudin, Muhammad Ridho Ananda, Nadya Rezky Andini, Mayang Putri Andiyansyah Sabarani Andiyansyah Z Sabarani Andiyansyah Z Sabarani, Andiyansyah Z Anggriani, Regina Mai Annisa Zahratul Hilma Annisa Zahratul Hilma Aperus, Rahmad Ardelia, Ariqah Ardian Putra Ardian Putra Ardian Putra Ari Febriana Kabisat Ari Febriana Kabisat, Ari Febriana Arif Budiman Arif Budiman Arif, M. Ariqah Ardelia Arisa, Deasy Asep Firman Ilahi Asep Firman Ilahi, Asep Firman Astuti Astuti - Astuti Astuti Astuti Astuti Atin Nur Aulia Atin Nur Aulia Aulia Latifah Aulia, Atin Nur Aulya Rahayu Aulya Rahayu, Aulya Badrul Mustafa Badrul Mustafa, Badrul Baihaqi, Rahmad Br. Sitanggang, Regina Mai Anggriani Dahyunir Dahlan Damayanti, Elok Dari, Riska Wulan Daswita, Alifvia Daz Edwiza, Daz Deasy Arisa Deasy Arisa Deasy Arisa Dedi Mardiansyah Denisa Syafriana Denisa Syafriana, Denisa Desi Indriani Desi Indriani, Desi Dian Fitriyani Dian Fitriyani Dian Milvita Diana Saputri Dika Aprilia Susanti Dimas Pramudito Dimas Pramudito Dwi Puryanti Ednofri - Ednofri - Ednofri - Ednofri Ednofri, Ednofri Edwards Taufiqurrahman, Edwards Ekarama Putri Ekarama Putri, Ekarama Eldiani Arifya Elistia Liza Namigo, Elistia Elvaswer Elvaswer Fadilla Monica Fadilla Monica Fariza, Mayola Feriska Handayani Irka, Feriska Handayani Fery Kurnia Sandi Fhatihatul Rahmi Fidia, Rahma Fitri Gustiana Fitri Gustiana Friska Puji Lestari Friska Puji Lestari, Friska Puji Friska, Vira Furqan, Ahmad Gustiana, Fitri Gustiana, Fitri Hafizhah, Luthfia Hamdy Arifin Hamdy Arifin Hamdy Arifin, Hamdy Hanif Hidayat Harmadi Harmadi Herifa - Herifa -, Herifa Hidayat, Hanif Hilma, Annisa Zahratul Ikhwan Safrima Illona giovanni, Vannessa Imam Taufik Imam Taufiq Indah Putri Utami Indah Putri Utami Indri Septiani Indriani, Widi Satria Iqbal Ramadhan Irma Kurniawati Irma Kurniawati Jarnal Witarsa Koko Ondara Koko Ondara, Koko Latifah, Aulia Lina Handayani Lina Handayani Lusi Fitrian Sani Lusi Fitrian Sani, Lusi Fitrian Luthfia Hafizhah M. Arif Mairisdawenti - Mairisdawenti -, Mairisdawenti Marlisa Marlisa Marlisa Marlisa, Marlisa Marzuki Marzuki Marzuki Marzuki Marzuki Marzuki Maya Minangsih Maya Minangsih Mayang Putri Andini Mayola Fariza Meqorry Yusfi Minangsih, Maya Minangsih, Maya Mochammad Imron Awalludin Mohammad Ali Shafii Monica, Fadilla Mora Mora Muhamad Rizki Agfustian Muhammad Arif Muhammad Kahfi Muhammad Razi Muhammad Razi Muhammad Ridho Amirudin Muldarisnur, Mulda Mutya Vonnisa Nadila Syarah Nadya Rezky Ananda Naela Amalia Zulfa Nini Firmawati Nofaslah, Rido Novia Anggraini Novia Anggraini Novia Dwi Agusri Nurdin Nurdin Nurdin Nurdin Nurul Annisa Nurul Hasanah Okci Mardoli Okci Mardoli, Okci Oktaviani, Violina Pertiwi, Rahmi Nanda Puspasari, Trevi Jayanti Putri, Yoci Darwita Rachmad Billyanto Rachmad Billyanto Rachmad Billyanto Rachmad Billyanto, Rachmad Rahma Fidia Rahmad Aperus Rahmad Aperus Rahmad Baihaqi Rahmat Rasyid Rahmi Nanda Pertiwi Rahmi, Fhatihatul 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 Sabarani, Andiyansyah Safrima, Ikhwan Sandi, Fery Kurnia Saputri, Diana Septiani, Indri Shinta, Velli Solly Aryza Sri Handani Sri Oktamuliani Sri Wahyuni Sri Wahyuni Sucy Lestari Wirma Sumi Daniati, Sumi Susanti, Dika Aprilia Syafda, Rohadatul Aisy Tanjung, Rita Ummi Sahida Titi Anggono Titi Anggono Toni Widianto Trengginas Eka Putra Sutantyo Trevi Jayanti Puspasari Usna, Sri Rahayu Alfitri Velli Shinta Violina Oktaviani Vira Friska Wendi Harjupa Widi Andewi Widi Satria Indriani Widianto, Toni Wildan Hafni Wildan Hafni, Wildan Witarsa, Jarnal Wiwit Reflidawati Wiwit Reflidawati, Wiwit Yoci Darwita Putri Yoci Darwita Putri Yudi Darma Yudi Darma Zulfi Zulfi Abdullah