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All Journal Journal of Teaching and Learning Physics Wahana Fisika : Jurnal Fisika dan Terapannya
Judhistira Aria Utama
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Astronomy Earth & Planetary Sciences Education Engineering Materials Science & Nanotechnology Physics

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PENENTUAN ZONASI GEMPA BERDASARKAN POLA PENYEBARAN GEMPA BUMI DI DAERAH PROVINSI JAWA BARAT Siti Azizah Sutisna; Mimin Iryanti; Judhistira Aria Utama
Wahana Fisika Vol 3, No 1 (2018): JUNE
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v3i1.10968

Abstract

Provinsi Jawa Barat dibatasi oleh 5°50’ sampai 7°50’ Lintang Selatan dan 104°48’ sampai 108°48’ Bujur Timur. Penelitian ini bertujuan untuk mengetahui seismisitas dan zonasi di daerah Provinsi Jawa Barat. Seismisitas dapat di ketahui dari peta seismisitas berdasarkan kedalaman dan magnitudo, untuk memperoleh peta seismisitas di daerah Provinsi Jawa Barat yaitu dengan menggunakan data gempa bumi tektonik harian atau realtime dengan periode terjadinya gempa bumi pada tahun 2000-2015, yang bersumber dari BMKG (Badan Meteorologi Klimatologi dan Geofisika) Klas 1 Bandung. Data gempa terdiri dari tanggal, waktu  terjadinya gempa, lintang, bujur, kedalaman dan magnitudo (M ≥ 4.5 SR), data yang ada di proses dengan menggunakan Software Arcgis 10.3 sehingga menjadi peta seismisitas yang telah di klasifikasikan berdasarkan kedalaman dan magnitudo gempa bumi. Zonasi di daerah Provinsi Jawa Barat di peroleh dengan menentukan nilai Percepatan Tanah Maksimum (Peak Ground Acceleration) yang terbagi kedalam 18 kabupaten, dan menentukan nilai PGA dan intensitas gempa di setiap Kabupaten, adapun cara untuk memperoleh nilai PGA dan intensitas gempa yaitu dengan melakukan proses perhitungan data gempa yang ada, dengan menggunakan metode Gutenberg Richter. Sehingga di peroleh kesimpulan berdasarkan peta seismisitas di dapatkan distrubusi gempa bumi berjumlah 792 gempa bumi, serta zonasi gempa bumi di daerah Provinsi Jawa Barat berdasarkan nilai PGA sebesar 25-29 gal, dan nilai intensitas gempa bumi sebesar V.West Java province bounded by 5 ° 50 'and 7 ° 50' south latitude and 104 ° 48 'to 108 ° 48' east longitude. This study aims to determine the seismicity and zoning in the area of West Java Province. Seismicity can be in the know of seismicity map based on the depth and magnitude, to obtain the map of seismicity in the area of West Java province is by using daily tectonic earthquake data or realtime with the period of the earthquake in the year 2000-2015, which is sourced from BMKG (Meteorology and Geophysics) Class 1 Bandung. Seismic data consists of the date, the time of the earthquake, latitude, longitude, depth and magnitude (M ≥ 4.5 SR), the data that is in the process of using ArcGIS 10.3 software so that a map of seismicity which has been classified based on the depth and magnitude of the earthquake. Zoning in the area of West Java province was obtained by determining the value of the Acceleration of Land Maximum (Peak Ground Acceleration), divided into 18 districts, and determine the value of PGA and intensity of earthquakes in each district, as for how to obtain the value of PGA and earthquake intensity by performing the calculation process existing seismic data, using Gutenberg Richter. Thus obtained conclusions based on maps of seismicity in distrubusi get earthquakes amounted to 792 earthquakes, and earthquake zoning in the area of West Java Province based on the value of the PGA of 25-29 gal and earthquake intensity value of V.Keywords: Zoning earthquake, seismicity , Software ArcGIS 10.3., Methods Gutenberg Richter earthquake intensity.
Jarak Minimum Orbit dan Tumbukan Populasi Asteroid dekat-Bumi dengan Planet Bumi Annisa Nur'imani Fauziah; Judhistira Aria Utama; Ferry Mukharradi Simatupang
Wahana Fisika Vol 5, No 1 (2020): June
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v5i1.23562

Abstract

ABSTRAKAsteroid dekat-Bumi diketahui memiliki orbit yang kaotik akibat seringnya terjadi papasan dekat dengan planet-planet terestrial. Orbit yang kaotik dapat membuat populasi objek ini berakhir sebagai penumbuk matahari maupun planet-planet. Dalam penelitian ini digunakan 3372 sampel asteroid dekat-Bumi nyata dengan orbit yang dikenal baik (U=0). Evolusi orbit sampel dilakukan dengan memanfaatkan paket integrator Swift_RMVS4 menggunakan model Tata Surya yang terdiri atas Matahari dan kedelapan planet termasuk Bulan sebagai objek terpisah. Propagasi orbit di bawah pengaruh gravitasi dilakukan hingga kurun 2 ´ 106  tahun ke depan dengan langkah waktu komputasi 10-3 tahun (~9 jam). Hingga akhir komputasi diperoleh fluks masuk sampel populasi asteroid dekat-Bumi yang berakhir di zona pembuangan (menumbuk Matahari, terlempar keluar Tata Surya, dan menumbuk planet-planet) adalah sebesar 14 ± 2 asteroid per juta tahun untuk H18 (bersesuaian dengan diameter asteroid 0,67 km – 1,5 km). Berdasarkan informasi jarak minimum orbit (Minimum Orbit Intersection Distance – MOID) seluruh sampel dengan planet Bumi dengan perhitungan berdasarkan geometri, diperoleh nilai kebolehjadian tumbukan intrinsik (Pi) sebesar 1,099 ´ 10-15 per km2 per tahun per objek yang bersesuaian dengan kejadian satu tumbukan dengan planet Bumi setiap 10 juta tahun. Frekuensi tumbukan yang diperoleh ini lebih singkat daripada yang disimpulkan dari penelitian terdahulu. Penggunaan sampel yang lebih banyak dan dengan kualitas orbit yang lebih baik diduga kuat menjadi faktor penyebab perbedaan. Near-Earth Asteroids had been known for their chaotic orbits due to frequent close-encounter with Terrestrial planets. These chaotic orbits responsible to their final fate as planets impactor. Within this work, sample of as many as 3,372 real Near-Earth Asteroids with high quaity orbit (U=0) have been used. The Swift_RMVS4 integrator package accomodating the Solar System model consists of all planets and treated the Moon as a separated object was employed. Asteroids’ orbit computation was run for 2 ´ 106 years forward with 10-3years (~9 hours) timestep and only gravitational force was considered. By the end of computation we found the entrance flux from near-Earth region into sinks (collide the Sun or planets and ejected from the Solar System) as many as 14 ± 2 asteroids per million years for H18 (asteroid’s diameter 0.67 km – 1,5 km). Based on computed asteroid’s minimum orbit distance (Minimum Orbit Intersection Distance – MOID), the intrinsic collision probability (Pi) is 1.099 ´ 10-15 per km2 per year per asteroid which correspond to one impact on Earth every 107 years. This value is lower than previously predicted by other researchers. The use of larger sample with high quality orbits within our work are suspected as the causative difference.    Keywords : Near-Earth Asteroids; Fractional Decay Rate; Collision Rate; MOID.
PATTERNS OF MISCONCEPTION CHANGE IN STELLAR EVOLUTION UNDER DIFFERENTIATED INSTRUCTION Hilda Permata; Winny Liliawati; Judhistira Aria Utama
Journal of Teaching and Learning Physics Vol. 10 No. 2 (2025): Journal of Teaching and Learning Physics (August 2025)
Publisher : UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jotalp.v10i2.49489

Abstract

This study maps changes in misconceptions about stellar evolution by emphasising three student-level categories: positive, stable, and negative change. Misconceptions in astronomy often persist in definitional concepts and causal relations. A quasi-experimental pretest–posttest design with experimental and control classes was employed. Data were collected using a fifteen-item, four-tier diagnostic; an item was considered understood when both the answer and the written reason were correct. We analysed each student’s total understanding score to classify individual change and then computed class-level proportions. Results show the experimental class was dominated by positive change 62.9%, followed by stable 25.7% and negative 11.4%; the control class showed positive 48.6%, stable 24.3%, and negative 27.0%. These findings indicate that differentiated instruction is more effective in reducing misconceptions at the individual level.
Co-Authors Annisa Nur'imani Fauziah Ferry Mukharradi Simatupang Hilda Permata Mimin Iryanti Siti Azizah Sutisna Winny Liliawati