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Komang Ngurah Suarbawa
Program Studi Fisika, FMIPA, Universitas Udayana, Kampus Bukit Jimbaran, Badung, Bali, Indonesia, 80361
Astronomy Education Materials Science & Nanotechnology Physics Other

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Penentuan Asumsi Waktu Berakhirnya Gempa Susulan Studi Kasus Gempabumi Lombok 5 Agustus 2018 Audrey Vellicia; Komang Ngurah Suarbawa; Rudy Darsono
Kappa Journal Vol 3 No 2 (2019): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v3i2.1609

Abstract

Indonesia is located at the meeting point of three active tectonic plates. The consequence is the country is very prone to earthquake disaster, one of the most devastated events is Lombok earthquake occurred on 5 August 2018. The aim of this study is to estimated ending time of aftershock using Omori, Mogi I, Mogi II, and Utsu method. Based on the result of Mogi I and Utsu method which has the correlation coefficient closest to -1 it is predicted that aftershock will stop on 96th weeks after the mainshock. By calculating the time data obtained, it is predicted that the aftershock will stop on the first week of June 2020.
PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION I Gusti Agung Putra Adnyana; Komang Ngurah Suarbawa; I Ketut Sukarasa
Jurnal Sains Materi Indonesia Vol 11, No 1: OKTOBER 2009
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (285.47 KB) | DOI: 10.17146/jsmi.2009.11.1.4560

Abstract

PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION. Telah dilakukan studi pengaruh ketebalan lapisan penyangga Galium Nitrida, GaN terhadap struktur kristal dan sifat optik film tipis GaN yang ditumbuhkan dengan metode Pulsed Laser Deposition (PLD). Lapisan penyangga ditumbuhkan pada suhu 450ºC dan laju aliran nitrogen 100 sccm dengan waktu deposisi divariasikan antara 15 menit sampai 45 menit. Film yang diperoleh dikarakterisasi dengan Profilometer DEKTAK IIA, Difraktometer sinar-X dan Spektroskopi UV-Vis. Ketebalan lapisan penyangga berpengaruhterhadap kualitas kristal dan sifat optik film tipis GaN yang ditumbuhkan di atasnya. Dari hasil analisis pola difraksi sinar-X dan spektrum UV-Vis, diketahui bahwa film tipis GaN yang ditumbuhkan di atas lapisan penyangga dengan ketebalan 184,6Å cenderungmemiliki orientasi tunggal (0002) yang lebih baik dengan Full Width at Half-Maximum (FWHM) 0,9º dan energi celah pita (Eg) = 3,4 eV dibanding film tipis GaN dengan ketebalan lapisan penyangga 370,2 Å dan 560 Å.
Analisis Tingkat Perubahan Vegetasi Hutan Mangrove Terhadap Tingkat Salinitas Menggunakan Citra Landsat Ramadhan, Rafly Rizqyta; Baskoro, Winardi Tjahyo; Sumaja, Kadek; Suarbawa, Komang Ngurah; Indrayana, Putu Tedy; Ratini, Ni Nyoman
Kappa Journal Vol 8 No 2 (2024): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i2.23729

Abstract

Research on the analysis of the level of changes of mangrove forest vegetation on the level of seawater salinity has been conducted with remote sensing methods by using Landsat 8 imagery in Tahura Ngurah Rai. The data used in this research is secondary data from the official website of the USGS (United States Geological Survey). This study aims to determine the levels of changes in mangrove forest vegetation cover in Tahura Ngurah Rai and to determine how much influence the level of mangrove forest vegetation cover has on the level of salinity in Tahura Ngurah Rai. The vegetation values were obtained by processing the NDVI index data and the salinity values were obtained by processing the SI, NDSI and VSSI index. from the results of the analysis that has been conducted, vegetation cover greatly influences the NDSI index with an increase in the total NDVI value of 25,48% and a decrease in the total NDSI value of -25,48%, with a correlation coefficient and determination of NDVI-NDSI 0.998 and 0.996 respectively.
Studi Pemetaan Kerawanan Gempabumi Berdasarkan Pola-Pola Sesar Menggunakan Focal Mechanism dari Data Gempabumi di Wilayah Bali Crisanti Uduk, Maria; Sukarasa, I Ketut; Tyastama, Arief; Suarbawa, Komang Ngurah; Wendri, Nyoman; Sandi, I Nengah
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29374

Abstract

Research regarding earthquake vulnerability mapping studies based on fault patterns using focal mechanism data from earthquake data in the Bali Region has been carried out. This research aims to determine fault patterns in the Bali region using a focal mechanism from earthquake data for 1976-2021, determine the types of faults in the Bali region when analyzed using the focal mechanism method and determine areas that are prone to earthquakes in the Bali region. The data used are seismograph recordings obtained from the Global Centroid Moment Tensor (CMT) and the United States Geological Survey (USGS). The method used in this research is the focal mechanism method. The results of mapping the distribution of focal balls in the Bali region are that there were 9 earthquake events above 4 M, with 8 events being thrust faults and 1 being an oblique fault. Areas that are prone to earthquakes are in the East Bali region, specifically in Karangasam, and in general earthquakes occur in water areas or at sea. The results of the seismicity map of the distribution of earthquakes show that the depth of earthquakes in the Bali region varies. On the seismicity map, it can be seen that the most dominant ones are earthquakes in the deep and medium earthquake categories, but the most dangerous are earthquakes in the shallow depth category.
THE EFFECT OF BARIUM SUBSTITUTION WITH COMBINATIONS OF RARE EARTH ON PERMANENT MAGNETIC SURFACE MORPHOLOGY BASED ON BARIUM HEXAFERRITE Adnyana, I Gusti Agung Putra; Suarbawa, Komang Ngurah; Nurmalasari, Ni Putu Yuni; Adi, Wisnu Ari
Indonesian Physical Review Vol. 7 No. 2 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i2.300

Abstract

The development of hard magnets today is progressing very rapidly. Developing hard magnets based on rare earth metals becomes a severe problem when the raw materials are not readily available. The chosen solution is to replace oxide-based permanent magnets with small amounts of rare earth metals substituted to improve their magnetic properties. This study synthesized a permanent magnet oxide based on barium hexaferrite doped with lanthanum and cerium atoms. In the synthesis of this material, a mechanical wet milling technique is used to obtain a single-phase permanent magnetic Ba1-β-γLaβCeγFe12O19 system with composition (β = 0 - 0.5 and γ = 0 - 0.1). The precursors are weighted according to their stoichiometric composition. Each mixed composition was milled by high energy milling (PW 1000 in the mixer/mill) at a milling speed of 1000 rpm using steel balls with an average diameter of 12 mm. Grinding conditions included a ball-to-powder weight ratio of 2:1, milling time 5 hours, then compacted with 7000 Psi pressure and sintered at 1200oC for 2 hours. The surface morphology and microstructure of the resulting sample particles were observed using scanning electron microscopy (SEM) with the SEM JEOL JED 305 brand. The characterization results show that the particles are hexagonally homogeneous in shape with particle sizes in the range of 1000-2000 nm for β = 0 and γ = 0 (without doping). In general, the four samples with varying concentrations of doping ions La3+ and Ce4+ showed homogeneous hexagonal structures but smaller particle sizes than pure barium hexaferrite. The sample particle sizes ranged from 500-1000 nm for β = 0.02 and 300-1000 nm for β = 0.04.
Pemetaan Peak Ground Acceleration di Daerah Nangroe Aceh Darussalam Menggunakan Data Hasil Rekaman Sinyal Seismik Hafidzi, Aldyan; Suarbawa, Komang Ngurah; Astra, Made Kris Adi
Kappa Journal Vol 7 No 1 (2023): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i1.12241

Abstract

The region of Nangroe Aceh Darussalam is a region with a high frequency of earthquake due to the location where the two biggest tectonic plates meet which is the Eurasia and Indo-Australia. This research is done to map the PGA using the digital signal processing method from seismic wave recording of the earthquake that happened in Beureun County on 7th of December 2016. The result is the highest PGA is from Banda Aceh Station with the value of 0,258 gal while the lowest PGA measured is from Sinabang island station with 0,014 gal
Perbandingan Metode Peluruhan untuk Memperkirakan Berakhirnya Gempabumi Susulan (Studi Kasus Gempabumi Signifikan di Wilayah Bali Tahun 2019-2020) Soleh, Anggun Mohamad; Sukarasa, I Ketut; Gunawan, Tomy; Suarbawa, Komang Ngurah; Sumadiyasa, Made; Anggarani, Ni Kadek Nova
Kappa Journal Vol 7 No 2 (2023): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i2.20743

Abstract

An Data collection and processing has been carried out to compare the aftershock decay method which aims to determine the assumption of aftershock ending time, how much energy, fracture length and fracture velocity occurred on the island of Bali. Data processing using several methods, namely the Omori method, the Mogi method I, the Mogi II method, and the Utsu method. The data used is based on the BBMKG Region III Denpasar earthquake catalog book, that’s is case of the Buleleng earthquake on November 14 2019, the Jembrana earthquake on July 16 2019 and the South Kuta earthquake on March 19 2020. Based on the results of data processing, for the Buleleng earthquake case the method closest to the observations was the Mogi II method with the energy is 1012 joules, the fracture length is 1.186 m and the fracture speed is 29.78 m/s. As for the Jembrana and South Kuta earthquake cases, the results of the calculation of all methods have not come close to the observations. The magnitude of the energy, the length of the fracture and the fracture speed of the Jembrana earthquake is 3.562313 joules, 32.733 m, 327.330 m/s. Whereas for the South Kuta earthquake, the energy, fracture length and fracture velocity were 3.162317 joules, 125.890 m, 70.750 m/s
Pemetaan Daerah Rawan Gempabumi Berdasarkan Nilai Parameter Kerapuhan Batuan Dan Peak Ground Acceleration(PGA) Di Wilayah Bali Suarbawa, Komang Ngurah; Adnyana, IGA Putra; Lestari, Amalia Dwi
Kappa Journal Vol 8 No 1 (2024): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i1.24283

Abstract

Bali is a region that is prone to earthquake hazards. This is because Bali is flanked by two earthquake-causing zones, first is the subduction zone in the south and thesecond one is back arc fault zone in the north. One of the efforts to minimize damage or loss caused by earthquakes is to anal yze the vulnerability of a region to earthquakes. In this study, the earthquakeparameters used as hazard indicators were the level of rock fragility (b-value) and peak ground acceleration (PGA). Based on the results of the b-value calculation byusing the Maximum Likelihood method, therock fragility level for Bali region is obtained from 0.370 to 1.419. Whilethe results of PGA calculation by using two empirical methods, there are the M.V. Mickeymethodand the Lin Wu method show that the M.V. Mickey method is more suitable for use in the Bali area. Based onthe results of PGA calculation by using the M.V. Mickey method obtained the PGA value for the Bali region is obtained from 517.32-828.58 gal. So based on theresults of the analysis of the b-value and PGA parameters, it was found that the area of Bali that is prone to earthquakes is the western part of Buleleng Regency and most of Jembrana Regency.
Co-Authors Adityo Mursitantyo Adityo Mursitantyo Adnyana, I Gusti Agung Putra Adnyana, IGA Putra Amalia Dwi Lestari Anin Nuril Firdausi Ardhianto Septiadhi Ardhianto Septiadhi Astra, Made Kris Adi Audrey Vellicia Baskoro, Winardi Tjahyo Crisanti Uduk, Maria Decky Irmawan Elvin Riyono Febi Niswatul Auliyah Gunawan, Tomy Gusti Ngurah Sutapa Hafidzi, Aldyan I G. A. Widagda I Ketut Putra I Ketut Putra I Made Yuliara I Nengah Sandi I Putu Agum Suriajaya Maha Putra I Putu Arix Putra Wiguna I Putu Dedy Pratama I Wayan Supardi I Wayan Wisnawa Saputra I.B. Alit Paramarta Ida Bagus Alit Paramartha Indira Indira Indrayana, Putu Tedy Ivan Bachtiar Pandapotan Jalut, Laura Laudensia Senly k krisna g Kadek Darmo Kadek Sumaja Kadek Sumaja Kadek Sumaja Kholidatul Islamiyah Laura Laudensia Senly Jalut Lestari Naomi L. Pandiangan Lestari, Amalia Dwi Made Padmika Made Sumadiyasa Mahayani, Ni Wayan Dewi Melki Adi Kurniawan Nandaru Diaz Ni Kadek Nova Anggarani Ni Luh Desi Purnami Ni Nyoman Susi Kesuma Wardani Ni Nyoman Susi Kesuma Wardani Ni Nyoman, Ratini Ni Putu Juliyant Ananda Rika Pangastuti Ni Wayan Dewi Mahayani Nurmalasari, Ni Putu Yuni Nyoman Wendri Padmika, Made Putu Suardana Ramadhan, Rafly Rizqyta Ridwan Kusnandar Romadhon Ilham Imani Rudy Darsono Ryan Juliston Pangihutan Simanjuntak Saputra, I Wayan Wisnawa Satriya Wibawa, I Made Soleh, Anggun Mohamad Sukarasa, I Ketut Sumaja, Kadek Syamsul Arifin Tomy Gunawan Tyastama, Arief Wardani, Ni Nyoman Susi Kesuma Wisnu Ari Adi Wisnu Ari Adi