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Dewa Gede Eka Setiawan
Universitas Negeri Gorontalo
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Studi Geolistrik untuk Menentukan Ketebalan dan Komposisi Sedimen di Danau Limboto, Gorontalo Mamonto, Yusril Mahendra; Yunginger, Raghel; Mursalin, Mursalin; Zainuri, Ahmad; Meidji, Icha Untari; Setiawan, Dewa Gede Eka
(JITEK)Jurnal Ilmiah Teknosains Vol 11, No 2/Nov (2025): Jitek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v11i2/Nov.23754

Abstract

This study aims to identify the type and thickness of sediment in Lake Limboto using the Schlumberger configuration geoelectric method. This method was chosen because of its ability to detect resistivity variations that reflect the characteristics of subsurface sediments. The research procedure begins with an initial survey to determine strategic measurement locations, followed by electrode arrangement and resistivity measurements. Data obtained from the measurements were analyzed using geophysical analysis software to produce a resistivity distribution model. The results showed that there were variations in sediment types, including sand, clay, and alluvial soil, as well as varying sediment thicknesses in various locations. These findings are expected to provide useful information for water resource management and mitigation of shallowing problems in Lake Limboto.
Effect of Soil Moisture on Vibration Detection Using an ESP32-Based IoT System Akuba, Kisman; Setiawan, Dewa Gede Eka; Yunus, Muhammad; Kurniasari, Septiana; Meidji, Icha Untari; Nuayi, Abd. Wahidin
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 6 No. 1 (2026): January
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v6i1.949

Abstract

Earthquakes are natural disasters that frequently occur due to inadequate soil structure and varying soil moisture conditions, which significantly influence ground vibration characteristics. This study aims to investigate the effect of soil moisture conditions, specifically dry and wet soil on vibration response. The system employs an SW-420 vibration sensor integrated with an ESP32 microcontroller for data acquisition and real-time monitoring. The experiment was conducted on a small-scale soil medium, with vibration data recorded at one-second intervals for a duration of 60 seconds. The measured vibration signals were transmitted and monitored in real time, then analyzed to determine which soil condition exhibits greater vibration damping characteristics. The results indicate that soil moisture has a significant effect on the vibration sensor response. The highest average ADC value was obtained in dry soil at 823.21, while wet soil produced a lower average ADC value of 533.16. The decrease in ADC values demonstrates increased vibration damping as soil water content increases. These findings confirm that higher soil moisture enhances energy absorption and reduces vibration transmission. Therefore, the IoT-based vibration detection system using the ESP32 and SW-420 sensor is capable of distinguishing soil vibration characteristics under different moisture conditions and shows strong potential for further development as an early warning system for landslide mitigation.
SOSIALISASI BERBASIS DATA FISIKA KELAUTAN UNTUK MENINGKATKAN KESADARAN RISIKO PESISIR DI DESA BINTALAHE KABUPATEN BONE BOLANGO Icha Untari Meidji; Dewa Gede Eka Setiawan; Muhammad Yunus; Harsano Jayadi
Jurnal Pengabdian Rekayasa Sistem Vol 4 No 1 (2026): Edisi 7
Publisher : Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Wilayah pesisir Desa Bintalahe, Kabupaten Bone Bolango, merupakan kawasan yang aktivitas masyarakatnya sangat dipengaruhi oleh dinamika fisika kelautan, seperti pasang surut, gelombang, arus laut, dan angin. Keterbatasan pemahaman masyarakat terhadap fenomena tersebut berpotensi meningkatkan risiko keselamatan dan kerentanan terhadap bencana pesisir, seperti banjir rob dan abrasi pantai. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan pemahaman dan kapasitas masyarakat pesisir Desa Bintalahe terhadap dinamika fisika kelautan sebagai dasar pengambilan keputusan aktivitas pesisir dan upaya mitigasi risiko. Metode pelaksanaan kegiatan meliputi pengambilan data lapangan parameter fisika kelautan, pengolahan dan visualisasi data secara deskriptif dan kuantitatif sederhana, serta sosialisasi hasil kepada masyarakat. Pengambilan data dilakukan pada November 2024, sedangkan kegiatan sosialisasi dilaksanakan selama satu hari pada 10 Januari 2025. Hasil kegiatan menunjukkan bahwa kondisi perairan selama pengamatan relatif tenang dengan pola pasang surut bertipe harian tunggal, gelombang dan arus laut yang umumnya rendah, serta kecenderungan sedimentasi yang bervariasi berdasarkan arah. Sosialisasi yang dilakukan dengan pendekatan visual dan diskusi interaktif mampu meningkatkan partisipasi dan pemahaman masyarakat dalam mengenali kondisi laut serta potensi risiko pesisir. Kegiatan ini diharapkan dapat menjadi langkah awal dalam penguatan literasi kelautan masyarakat pesisir dan mendukung pengelolaan wilayah pesisir yang lebih aman dan berkelanjutan.
Seismic Hazard Assessment in Gorontalo: Subduction Zone and Earthquake Analysis Icha Untari Meidji; Dewa Gede Eka Setiawan; Irsan; Kartika; Harsano Jayadi
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12956

Abstract

The Gorontalo region is one of the regions on the island of Sulawesi that is quite significant in terms of tectonic activity due to earthquakes. This is because Gorontalo is located in a tectonic environment, with a subduction zone in the Sulawesi Trench north and the Balantak Thrust and Batui Thrust south of the Gorontalo Fault. To further understand Gorontalo's seismic activity, we conducted a seismotectonic analysis in the form of identifying the number of earthquakes from 1994 to 2025, interpreting the results of the focal mechanism distribution by classifying them in the Kaverina diagram, and analyzing the results of earthquake hypocentre relocation from 2015 to 2022. The study results show that 2.317 earthquake events over 30 years spread across all areas of Gorontalo, categorised as shallow, medium, and deep earthquakes. The Gorontalo area is dominated by reverse faulting focus mechanisms, which are commonly found at shallow to intermediate depths. This is interpreted as being due to the presence of a subduction zone. A different situation occurs at deep depths, where the focal mechanism is normal faulting, indicating the presence of extensional forces due to the rollback slab process. The distribution of earthquake mechanisms also shows that a combination of strike-slip and reverse mechanisms occurs around active fault zones. In contrast, strike-slip mechanisms with standard mechanisms are more dominant in extensional zones.
Analysis of the Hydrodynamic Characteristics of Limboto Lake Waters Based on Momentum Fluxes Khan, Mikail Gabriel Khan; Yunginger, Raghel Yunginger; Setiawan, Dewa Gede Eka; Jahja, Mohamad; Meidji, Icha Untari; Ahmadi, Haerul; Kusmayancu, Cucu; Nalle, Merpati Teodoris
BULETIN FISIKA Vol. 27 No. 1 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i01.p02

Abstract

The waters of Lake Limboto show a decline in water quality, characterized by a decrease in clarity. Environmental factors, such as wind speed and direction, play a significant role in influencing the dynamics and quality of lake waters. To understand the influence of wind on water conditions, a comprehensive hydrodynamic study is required. This study focuses on analyzing the hydrodynamic characteristics of Lake Limboto waters based on momentum flux and its implications for lake water conditions. Wind speed and direction measurements were conducted on seven ducks in Lake Limboto waters during the period of November 1-3, 2024. Data were collected in the morning, afternoon, and evening. The lake's hydrodynamic characteristics were determined using formulas from the measured data. Hydrodynamic characteristics were interpolated using IDW cross validation leave one out and optimized with rank and neighboring point parameters. Wind direction was interpolated using IDW and converted into a vector field using Vector Field Layer Manager. It was found that the momentum flux by wind in Lake Limboto waters has a value range of 0-0.05 N/m2, and cross validation produced an RMSE of 0.003-0.01 N/m2. The interaction of momentum flux from wind and river flow causes sediment to be deposited in the coastal area of ​​Lake Limboto.
Real-Time and Accurate pH Sensor Based on Internet of Things (IoT) Ikano, Robin; Setiawan, Dewa Gede Eka; Yunus, Muhammad; Demulawa, Meilan; Rahman, Irsan
Dewantara Journal of Technology Vol. 5 No. 2 (2025): Dewantara Journal of Technology Volume 5 Nomor 2
Publisher : Akademi Teknologi Industri Dewantara Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59563/djtech.v5i2.312

Abstract

One important parameter that needs to be considered in water quality is the acidity level (pH) in the water. This study aims to design and determine real-time and accurate pH sensor based on internet of thing (IoT). This system design uses an ESP32 microcontroller and The PH-4502C pH Meter Module sensor. The ESP32 can be connected to the IoT-based Blynk platform, allowing pH data to be monitored in real time via a smartphone. Testing of the IoT-based pH sensor was conducted to evaluate the system's real-time operation under varying distances. Meanwhile, the pH sensor's accuracy was determined by comparing its output with a digital pH meter using buffer solutions at different pH levels. The test results show that the time value required in each range is always constant, namely 1 s. This proves that IoT-based monitoring does not affect the range. Meanwhile, measurement of pH level was the average error value is 3.49%, and the sensor accuracy is 96.51%. These results indicate a low error rate, resulting in high accuracy. The sensor error value of 3.49% is lower than the specified error tolerance limit of <5%. This proves that the pH sensor, with an accuracy of 96.51%, is suitable and reliable for measuring pH in solutions.
Co-Authors AA Sudharmawan, AA Abd Rahman Abd Wahidin Nuayi Abdi Gunawan Djafar Abdul Haris Odja Abdulrahman Djou Ahmad Zainuri Ahmadi, Haerul Akuba, Kisman Andi Indra Wulan Sari Ramadani Andi Iskandar Andi Patiewere Metaragakusuma Anggo, Nina Shaqina Anisa Fauzia Ardita Ardita Ardiyanto, Kamal Asi, Algianto Asri Arbie Audina Setyawaty D. Buta Aulia Fitrah Ramadhani Bokori, Nur A S Buhungo, Trisnawaty Junus Bunga Tang Citron S Payu Citron S. Payu Damopolii, Relita Danial, Yulistia Anggraini Desi Kiswiranti Dewahastu Gaib Dewaputu, Nugraha Oktofelly Dewi Diana Paramata Dzakiya, Nurul Elfiana Elfiana Elfiana Elfiana, Elfiana Elvira Ariyanto Pakaya Fira Lakoro Gafur, Nurfitri Abdul Gamar Abdullah Goma, Metalika Habibi, Moh Arif Alfan Haris Odja, Abdul Harsano Jayadi Hasan, Ananda Febryana Hasani, Sintia Nasir Hersiq Basri Hidayah, Radhitya Adzan Hidjrawaty Tantu Husen, Maman Hermana I Komang Wijaya I Made Hermanto Ikano, Robin Ilato, Nursuciani Radja Indriati Martha Patuti Irsan Irsan Rahman, Irsan Isa, Putri Cahyani Iswanto A. Yunus Jahja, Mohamad Jahja, Muhamad Karim, Rahmiaty Abd. Kartika Kasim Dihuma Khan, Mikail Gabriel Khan Kobandaha, Restiyanti Kuengo, Nur Rahma Kurniasari, Septiana Kusmayancu, Cucu Lantapon, Nancy Noviana Larasati Sukmadewi Wibowo Lasumbu, Indrawati Latief, Fachrul Latief, Muh. Fachrul Lipoeto, Moh. Ramdan Lukman Samatowa Mahmud, Surti A. Mamonto, Siti Nurhaliza Mamonto, Yusril Mahendra Masayuki Sakakibara Masra Latjompoh Masri Kuadrat Umar Masri Kudrat Umar Masri Kudrat Umar Meidji, Icha Untari Meilan Demulawa Mobiliu, Fajar Putra Moh Arif Alfan Habibi Mohamad, Wahyu Muzizat Mohamad, Wahyu Mu’zizat Mohammad Yusuf Mooduto, Ferna Panto Suharto Muammad Irfan Dunggio Muh Fachrul Latief Muhammad Agsti Buana Aditya Muhammad Faizal Zakaria Muhammad Yunus Muhammad Yunus Muhammad Yunus Muhammad Yunus Muhammad Yusuf Muhammad Yusuf Muksin, Engelina Mursalin Mursalin . Nalle, Merpati Teodoris Nina Shaqina Anggo Nismawati A Haruna Nova Elysia Ntobuo Nover Tiara Jelita Ntobuo, Nova E. Nurfadillah Abdullah Nurhidayah Nurhidayah Puput Salsabina F. Satri Rabiasa, Sri Alda Rabiyanti B. Kamali Raflin Hamzah Taib Rahim, Niarti Ramadani, A. Indra Wulan Sari Rifai, Rusni R Ritin Uloli Rizky Prayatman Robertus Belardo Laksmana Rum, Junita Angraini Styaning Salmawaty Tansa Salmawaty Tansa Samatowa, Lukman Sandi, Febriyanti Yuliana Sarni Ngadi Septiana Kurniasari Sintia Nasir Hasani Siti Fazria Tobuto Sri Nuryatin Hamzah Sri Yanti N Ismail Stenly Tampi Subhan Arif Supartin Supartin Supartin Supartin, Supartin Supu Idawati Supu, Idawati Supu, Idawaty Suwaldi Mopangga Syaripudin, Magfira Taib, Raflin Hamzah Tirtawaty Abdjul Tsutomu Yamaguchi Vivit Idrus Yita Irmala Sari Yudoyono, Susilo Yunginger, Raghel Yunginger Zulkifli, M