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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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Studi Bahaya Seismik dengan Metode Probabilistic Seismic Hazard Analysis di Sumatera Barat Daswita, Alifvia; Pujiastuti, Dwi; Anggono, Titi
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.444-450.2023

Abstract

Telah dilakukan penelitian bahaya seismik untuk mengetahui nilai percepatan tanah maksimum atau Peak Ground Acceleration (PGA) dan tingkat bahaya seismik di Sumatera Barat menggunakan metode probabilistic seismic hazard analysis (PSHA). Data gempa bumi berasal dari katalog ISC, USGS dan GCMT dalam rentang 1972-2022. Nilai PGA dicari menggunakan fungsi atenuasi dengan probabilitas terlampauinya 10% dan 2% dalam 50 tahun. Hasil penelitian menunjukkan PGA maksimum untuk probabilitas terlampauinya 10%  dan 2% dalam 50 tahun adalah 1,2 gal dan 1,94 gal. Wilayah dengan tingkat bahaya seismik tinggi berada di Kabupaten Mentawai dengan nilai PGA 0,8-0,95 gal dan 1,35-1,54 gal pada probabilitas terlampauinya 10% dan 2% dalam 50 tahun. Wilayah dengan tingkat bahaya seismik sedang sampai tinggi berada di wilayah Bukit Barisan diantaranya Kota Padang, Kota Pariaman dan Kota Bukitinggi dengan PGA 0,39-0,75 gal dan 0,65-1,33 gal pada probabilitas terlampauinya 10% dan 2% dalam 50 tahun. Wilayah dengan tingkat bahaya seismik rendah sampai sedang berada di belakang Bukit Barisan seperti Kabupaten Dharmasraya, Kabupaten Sijunjung dan Kota Payakumbuh dengan PGA <0,4 gal. Berdasarkan nilai PGA maka didapatkan bahwa Sumatera Barat memiliki tingkat bahaya seismik sedang sampai tinggi secara keseluruhan dan tinggi pada daerah Siberut dan Pagai Selatan karena berada pada zona megathrust dan sesar Mentawai.
Pemodelan 3D Bidang Gelincir Tanah Longsor Menggunakan Metode Geolistrik di Bukit Nobita Padang Arif, M.; Pujiastuti, Dwi; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 13 No 1 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.1.15-21.2024

Abstract

The surface of rupture investigation has been conducted at Nobita Hill, Kampung Jua, Lubuk Begalung, Padang City using the 3-dimensional resistivity geoelectric method in Wenner configuration. The research was conducted in a hilly area with a slope of up to 40º. Data was collected on three tracks with variations in length lengths of 120 and 240 m. The electrode spacing is 6, 12, 18, and 24 m for current and potential electrodes. Data processing was carried out using Res2dinv software to display a 2-dimensional image of the subsurface layer based on the resistivity values measured in the field. The results of 2-dimensional image processing were then modeled in 3 dimensions using Voxler software. Data interpretation of the results obtained by Track 1 has a resistivity value of 1170-2028 Ωm at a depth of 4.5-19.1m. Track 2 has a resistivity value of 1052-1768 Ωm with a depth of 4.5-19.1 m. Track 3 has a resistivity value of 1492-2937 Ωm at a depth of 1.5-19.1 m. The direction of the sliding plane of Tracks 1 and 2 is to the northwest, while track 3 is to the northeast. The results showed that the sliding plane on each track is granite.
Pemodelan Anomali Magnetik Untuk Identifikasi Struktur Bawah Permukaan Bumi Di Nagari Cupak Kabupaten Solok Furqan, Ahmad; Pujiastuti, Dwi; Puryanti, Dwi; Putra, Ardian
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 Sandi, Fery Kurnia; Pujiastuti, Dwi; Marzuki, Marzuki; Friska, Vira
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 Fariza, Mayola; Pujiastuti, Dwi
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 Ananda, Nadya Rezky; Pujiastuti, Dwi
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) Utami, Indah Putri; Pujiastuti, Dwi
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.
Google Classroom: The Web-Based Media for Teaching English Andewi, Widi; Pujiastuti, Dwi
Jurnal Penelitian Ilmu Pendidikan Vol. 14 No. 2 (2021): September-November
Publisher : Fakultas Ilmu Pendidikan, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpipfip.v14i2.41450

Abstract

This study investigates whether: 1) Google Classroom is more effective than the conventional method for teaching writing; 2) The high creativity students have better writing skills than those who have low creativity, and; 3) Interaction between teaching method and students' creativity in teaching writing occurs. This quasi-experimental study was conducted at STMIK Pringsewu in the academic year of 2020/2021.  The sample of this research was two classes, the namely experimental class taught using Google Classroom, and the control class taught using a conventional method. Each class consisted of 20 students, so the total sample is 40 students. The sample was obtained by using the cluster random sampling technique. Each class was divided into two groups, consisting of ten high creativity students and ten low creativity students. The data of this research were obtained from a writing test to find out students' writing scores. Then, the data were analyzed by using 2x2 multifactor analysis of variance ANOVA and Tukey test. The results show that the mean scores of A1B1 are 82.40, A2B1 is 75.30, A1B2 is 68.70, and A2B2 is 69.70. This study implies that Google Classroom is an effective method in teaching writing and is suitable to be implemented to those having high creativity. Google Classroom: Media Berbasis Web untuk Mengajar Bahasa Inggris Penelitian ini menyelidiki apakah: 1) Google Classroom lebih efektif daripada metode konvensional dalam mengajar menulis; 2) Siswa yang kreativitasnya tinggi memiliki kemampuan menulis yang lebih baik dibandingkan siswa yang kreativitasnya rendah; dan 3) Terjadi interaksi antara metode pengajaran dan kreativitas siswa dalam pembelajaran menulis. Penelitian kuasi eksperimen ini dilakukan di STMIK Pringsewu pada tahun pelajaran 2020/2021. Sampel penelitian ini memiliki dua kelas yaitu kelas eksperimen yang diajar menggunakan Google Classroom dan kelas kontrol yang diajar dengan metode konvensional. Setiap kelas terdiri dari 20 siswa, sehingga jumlah sampel adalah 40 siswa. Sampel diperoleh dengan menggunakan teknik cluster random sampling. Setiap kelas dibagi menjadi dua kelompok yang masing-masing terdiri dari 10 siswa kreativitas tinggi dan 10 siswa kreativitas rendah. Data penelitian ini diperoleh dari tes menulis untuk mengetahui nilai menulis siswa. Kemudian data dianalisis dengan menggunakan analisis multifaktor varians 2x2 dan uji Tukey. Hasil penelitian menunjukkan bahwa nilai rata-rata A1B1 adalah 82,40, A2B1 adalah 75,30, A1B2 adalah 68,70, dan A2B2 adalah 69,70. Hasil penelitian ini mengimplikasikan bahwa Google Classroom merupakan metode yang efektif dalam pengajaran menulis dan cocok untuk diterapkan bagi mereka yang memiliki kreativitas tinggi.
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