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Analysis of Groundwater Decline and Land Subsidence by using of Microgravity and Vertical Gravity Gradient Over Time Method Minardi, Suhayat; Hiden, Hiden; Dahrin, Daharta; Yusuf, Mahmud
Jurnal ILMU DASAR Vol 15 No 1 (2014)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1791.845 KB) | DOI: 10.19184/jid.v15i1.643

Abstract

Studies have been conducted to identify the occurrence of subsidence, a decline of groundwater, and to model the causes of subsidence in areas of Jakarta based on response of microgravity anomaly and vertical gravity gradient over time. Based on the processing and interpretation of gravity data advance of the time concluded that by using a combination of time lapse microgravity and its vertical gradient have been able to localize the source of the gravity anomaly and the results are strongly support the results of filtering to separate the source of the anomaly. The subsidence that occurs predominantly due to resettlement (in West and North Jakarta), caused by the extraction of groundwater and resettlement (in Central and East Jakarta), and dominated due to the extraction of groundwater (in South Jakarta).Keywords : Groundwater, time lapse micogravity, time lapse vertical gradient, resettlement, subsidence
PENDAMPINGAN KEGIATAN PENDALAMAN KONSEP-KONSEP DASAR FISIKA DAN MATEMATIKA BAGI GURU-GURU ANGGOTA MGMP Marzuki, Marzuki; Sudiarta, I Wayan; Handayana, I Gusti Ngurah Yudi; Hiden, Hiden; Qomariyah, Nurul
SELAPARANG Jurnal Pengabdian Masyarakat Berkemajuan Vol 3, No 1 (2019): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (222.961 KB) | DOI: 10.31764/jpmb.v3i1.1279

Abstract

ABSTRAKDalam kurun waktu yang cukup lama, bagi sebagian siswa di sekolah beranggapan bahwa pelajaran Fisika dan Matematika merupakan pelajaran yang sulit. Kedua mata pelajaran ini merupakan momok bagi siswa di kebanyakan sekolah, tidak saja di daerah Provinsi Nusa Tenggara Barat (NTB) tetapi juga di berbagai daerah lain di seluruh Indonesia. Untuk itu berbagai upaya perlu dilakukan untuk  mengatasi permasalahan kesulitan belajar tersebut. Tidak sedikit guru mengeluhkan rendahnya kemampuan siswanya terutama pada pemahaman konsep-konsep dasar  Fisika dan juga Matematika. Ada banyak faktor yang mempengaruhi hal ini, salah satunya adalah faktor input (siswa). Siswa yang berasal dari berbagai sekolah berbeda memiliki tingkat pemahaman yang berbeda pula, baik dalam bidang Fisika maupun Matematika. Atas dasar kondisi yang heterogen inilah penulis mengadakan kegiatan pengabdian masyarakat berupa pemantapan pemahaman konsep-konsep dasar Fisika dan Matematika bagi guru dan juga siswa sebagai bekal awal mereka dalam mengkaji materi selanjutnya secara lebih mendalam, terutama di sekolah luar kota. Kegiatan pengabdian ini dilaksanakan di SMPN 2 Sekotong Lombok Barat. Secara umum dapat disimpulkan bahwa kegiatan ini dapat meningkatkan pemahaman para guru pada konsep-konsep dasar Fisika maupun Matematika, sehingga diharapkan guru dapat menerapkan pemahamannya itu dalam membelajarkan permasalahan-permasalahan yang lebih kompleks kepada siswanya. Kata kunci: pendampingan, konsep dasar, fisika, matematika, MGMP ABSTRACTIn a long period of time, for some students at school assume that physics and mathematics lessons are difficult subjects. Both of these subjects are a scourge for students in most schools, not only in the West Nusa Tenggara Province (NTB) but also in various other regions throughout Indonesia. For this reason, various efforts need to be made to overcome these learning difficulties. Not a few teachers complained about the low ability of their students, especially in understanding the basic concepts of Physics and Mathematics. There are many factors that influence this, one of which is the input factor (students). Students from different schools have different levels of understanding, both in the fields of Physics and Mathematics. On the basis of this heterogeneous condition, the writer conducted community service activities in the form of strengthening understanding of the basic concepts of Physics and Mathematics for teachers and also students as their initial provisions in studying further material in more depth, especially in schools outside the city. This dedication activity was carried out at SMPN 2 Sekotong West Lombok. In general it can be concluded that this activity can increase the understanding of teachers on the basic concepts of Physics and Mathematics, so it is expected that teachers can apply their understanding in learning more complex problems to their students. Keywords: assistance, basic concepts, physics, mathematics, MGMP
PENDAMPINGAN PENGGUNAAN MEDIA PEMBELAJARAN BERBASIS KIT IPA UNTUK PEMBELAJARAN FISIKA DI SMPN 2 SEKOTONG Wirawan, Rahadi; Qomariyah, Nurul; Minardi, Suhayat; Syamsuddin, Syamsuddin; Hiden, Hiden; Sudiarta, Wayan; Marzuki, Marzuki
SELAPARANG Jurnal Pengabdian Masyarakat Berkemajuan Vol 4, No 2 (2021): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v4i2.4493

Abstract

 ABSTRAKKegiatan pengabdian kepada masyarakat ini dilakukan guna meningkatkan kemampuan penggunaan dan pemanfaatan set eksperimen Komponen Instrumen Terpadu (KIT) IPA untuk penggalian konsep-konsep dasar Fisika siswa melalui pembelajaran berbasis eksperimen. Kegiatan pengabdian dilaksanakan di SMPN 2 Sekotong Kabupaten Lombok Barat, dengan peserta guru-guru Fisika dan siswa-siswa kelas 8. Metode yang digunakan dalam kegiatan ini adalah direct instruction, cooperative learning dan diskusi. Adapun set eksperimen yang digunakan adalah KIT IPA untuk materi Mekanika, Panas dan Hidrostatistika, Optik, dan Listrik Magnet. Pada kegiatan ini peserta memperoleh pengetahuan tentang metode pembelajaran berbasis eksperimen dan keterampilan merakit serta memodifikasi KIT IPA yang dapat digunakan untuk mendukung pembelajaran Sains. Dengan demikian, pembelajaran Sains akan menjadi pembelajaran yang menyenangkan dan diharapkan meningkatkan minat dan prestasi belajar siswa. Kata kunci: KIT; konsep fisika; eksperimen; ketrampilan; minat belajar. ABSTRACTThis community service activity is carried out to improve the ability to use the IPA Integrated Instrument Components (IIC) experimental set to explore the student basic concepts of physics through experiment-based learning. This activity was carried out at SMPN 2 Sekotong West Lombok Regency with participants from physics teachers and 8th-grade students. The method that used is direct instruction, cooperative learning and discussion. The experimental set used is the IPA IIC for the materials of Mechanics, Heat and Hydrostatic, Optics, and Magnetic Electricity. In this activity, participants gain knowledge about experimental based learning methods and skills of assembling and modifying science KITs that can be used to support science learning. Thus, science learning will be fun learning and it is expected to increase student interest and learning achievement. Keywords: IIC; physics concept; experiment; skills; learning interest.
Subsurface Structure Models Of Sumbawa Island And Flores Back Arc Thrust Based On Gravity Data Minardi, Suhayat; Mudyanto, Ahmad; Hiden, Hiden
Jurnal Penelitian Pendidikan IPA Vol. 7 No. 3 (2021): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v7i3.826

Abstract

Based on the BMKG report on Wednesday, July 29, 2018, at 05.47 WIB, an earthquake with a magnitude of 6.4 SR occurred at the epicenter at a depth of 24 km and was 47 km northeast of the island of Lombok. They are allegedly originating from the Back Arc Thrust Flores, the interaction between the Indo-Australian Plate and the Eurasian plate. This study aims to analyze the subsurface structure of the island of Sumbawa and Flores sea based on the distribution of density values. The analysis was carried out by modeling the subsurface structure based on regional gravity field anomaly data. The data used is secondary data downloaded from the topex.ucsd.edu page 18,400 measuring points. Data processing consists of data correction, separation of anomalies, determination of the Second Vertical Derivative (SVD) value, and 3D and 2D inversion modeling. The data corrections performed are Bouguer correction and terrain correction to produce the total gravity anomaly value. Upward continuation is used to separate regional anomalies and residual anomalies. Analysis of the Second Vertical Derivative (SVD) value was carried out to identify rock contact positions and fault structures. The 3D inversion modeling is done by making a mesh model, and to get a 2D cross-section, six slices are used in the 3D model. The results of the 3D model and 2D cross-section, namely the island of Sumbawa to the Back Arc Thrust zone of Flores, consists of 3 main layers comprised of the upper crust with a density of 2.29 gr/cc - 2.63 gr/cc, the middle crust with a density of 2.64 gr/cc - 2.90 gr/cc, and the lower crust with a density of 2.91 gr/cc - 3.14 gr/cc, and based on the model and SVD value, it shows that the Flores back fault, the reverse fault type, starts at a depth of ± 26 km
Accuracy and Automatic Computation of Seismic Refraction: a case of Forward Modeling and Inversion Hiden, Hiden; B, Kirbani S; S, wiwit; S, Hadmoko D; Setiawan, Ari
Gravitasi Vol. 13 No. 1 (2014)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/gravitasi.v13i1.4447

Abstract

It has been built a data processing program to perform the first arrival waktu tempuh inversion of seismic refraction profiles zero distance. Analysis of the first wave arrival time is obtained by 1) using two-way analysis of time-taking to control the accuracy of the passage and identify the mistakes geometry,, 2) parameterization slowness and intercept-time of travel-time, in which the velocity model and multi-layer thickness obtained by inversion LSQ method (unconstrained, constrained and Marquardt) on seismic refraction. For automatic calculation and accurate, we make a data processing program for the third inversion LSQ method. Analysis of the model resolution and measurement data to determine the optimal parameters of the model, the algorithm used Menke (1989). Resolution inversion results, we tested with: forward modeling, the level of misfit (error) and the convergence between the observed data and the model. Once the program is successfully tested on a number of data, then we apply to the real seismic. The results of field data inversion interpreted that the subsurface strata bedding row from the top (first layer) in the form of: soil, sand (loose), sand (saturated, loose) and sandstone, limestone. Resolution velocity and thickness in the forward modeling program: a) the error between: 10-17 - 10-5 and b) the residue of convergence is: 10-11-10-4, while the resolution of the results of the third inversion LSQ method on the field data, obtained misfit between: 10-17 - 10-4 and residual convergence between measurement data and the model are: 10-11 -10-4.Keywords —seismic refraction, forward modeling, LSQ inversion, parameter models, resolution.