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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL Eksergi: Chemical Engineering Journal Syntax Literate: Jurnal Ilmiah Indonesia Journal of Physics and Its Applications Jurnal Energi Baru dan Terbarukan Eksergi: Jurnal Teknik Energi Asian Journal of Social and Humanities
Udi Harmoko
Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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STUDI ALIRAN FLUIDA MANIFESTASI PANAS BUMI DESA DIWAK DAN DESA DEREKAN, KECAMATAN BERGAS, KABUPATEN SEMARANG MENGGUNAKAN METODE TAHANAN JENIS 3D. Hotlan Simbolon; Udi Harmoko; Gatot Yulianto; Sugeng Widada; Yusuf D. H.; Sahid Sahid
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research use geolistric method that aims to analize the system of manifestation of fluida distribution geothermal on Diwak, Derekan Central Java, based on measurement of geolistric 3-D with pole - pole configuration, has been done. Data processing is performed using software Res3dinv and surfer which results in a horizontal and vertical cross-section. The results of the interpretation of 2D processed by software rockwork to obtain 3-D cross-section. The results showed that the measurement point 1, the direction of the fluid flow toward the east. Measurement point 2, the direction of flow of the fluid toward the northwest, the fluid flow direction to both of the points towards Lutung river. Keywords : Fluida, pole-pole konfiguration, Diwak, Derakan
IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI AREA PANASBUMI DESA DIWAK DAN DEREKAN KECAMATAN BERGAS KABUPATEN SEMARANG Sigit Darmawan; Udi Harmoko; Sugeng Widada
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Diwak and Derekan is one of geothermal manifest which exist in geothermal system of Ungaran. Geoelectric method schlumberger configuration is one of the geophysical methods that used in the exploration of natural resources below the surface. The purpose of researching is to know layer of subsurface structure which control Diwak and Derekan geothermal manifest.Field measurement data in the field are potential differences and currents which can be used to calculate apparent resistivity value. After apparent resistivity value is created then processed using IPI2WIN program to know resistivity value in each layer with geology information validation.The results of the study showed six geoelectric layer of rock that is composed of layers of mudstone, siltstone, tuff, sandstone brecia and pasirtuf with resistivity values and different thicknesses. Interpretation of manually indicate the presence of two down faults that are weak zone where the fluid surface discharge Keyword: Geoelectric, Schlumberger, Geothermal, Fault, Diwak and Derekan
PENCITRAAN STRUKTUR BAWAH PERMUKAAN KOMPLEKS MENGGUNAKAN METODE PRE-STACK DEPTH MIGRATION DENGAN ALGORITMA HORIZON BASED TOMOGRAPHY PADA LAPANGAN “MF-3D” Muhammad Fahmi; Hernowo Danusaputro; Udi Harmoko
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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A research in “MF-3D” field under Pre Stack Depth Migration method for 3D seismic reflection data has been carried out. PSDM selected to describing to perfect subsurface structure that obtain. This research aimed to applying initial interval velocity model determination method in PSDM to obtain better imaging subsurface structure with lateral velocity variation. Initial interval velocity model determination method which used was Dix Transformation and Constrained Velocity Inversion (CVI). Velocity model is quite sufficient to determining interval velocity in shallow layer and inclined flat under Dix Transformation. However, Dix Transformation precisely obtains less sufficient and unstable interval velocity in deeper subsurface layer. CVI conducted to determining initial interval velocity model which required to obtaining better and stable interval velocity in deeper subsurface layer. Both models required to obtaining initial model of 3D seismic section in depth domain as PSDM result. That model will get correction by using Horizon Based Tomography Algorithm in further step. This research yields initial 3D interval velocity model as input for PSDM process. Key Word: Pre Stack Depth Migration (PSDM), Constrained Velocity Inversion (CVI), Horizon Based Tomography
ANALISIS PENGOLAHAN DATA SEISMIK LAPANGAN “R” DENGAN METODE CRS (COMMON REFLECTION SURFACE) STACK PADA DATA CROSS SECTION MARINE 2D Rezyta Handani; Udi Harmoko; Istiqomah Ari Kusuma
Youngster Physics Journal Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACTIn complex geological data processing, conventional method has not been able to produce good imaging. The result of conventional method processing can be supported by Common Reflection Surface Method (CRS) stacking. This method is believed to have better mathematical operation compared to conventional method, especially in Normal Move Out (NMO) correction. CRS stack method using correct operator stacking for recorded reflector in pre-stack data is proven better than conventional method. Operator CRS stacking consists of 3 kinematic wavefield attributes namely α, RNIP and RN. CRS stacking process to acquire good CRS section involved angle, aperture, and dip test. The selected parameter was then released as CRS supergather which then was used as the input of PSTM process. The best CRS operator was obtained using the parameters as follows:  apperture 500 – 2000m and angle 45˚. This result was able to increase the continuity and the reflector accuracy. Nevertheless, CRS stack also caused spectrum reduction in high frequency but it was able to be overcomed using Whitening. CRS supergather shows better result than conventional supergather using PSTM process. During the research, CRS analysis in the cross section of two tracks as the development of CRS application was also performed, where the sections resulted from CRS Stack did not influence the cross section of those two tracts.
INTERPRETASI POLA ALIRAN FLUIDA PANAS BUMI DENGAN METODE SPONTANEOUS-POTENTIAL (SP) DAN SUHU PERMUKAAN DANGKAL DI LERENG UTARA GUNUNG TELOMOYO KABUPATEN SEMARANG Maila Shofa; Udi Harmoko; Sugeng Widada
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The model heat flow at  Telomoyo Mountain Semarang District  has measured and identified  using spontaneous potensial and  shallow temperature surface methods.Field data has proceed using Microsoft Excel which the result entered to Surfer11 with the result map contour of SP and temperature distribution. The result showed that range anomaly SP about -40mV-70mV and distribution of temperature which has temperature range 23,5º-31ºC. The direction of heat flow direct from South to North-East.Key Words : Spontaneous-potential, shallow temperature surface, Sufer11, Model Heat Flow, Telomoyo Mountain
ANALISIS STRUKTUR BAWAH PERMUKAAN DAERAH HARJOSARI KABUPATEN SEMARANG MENGGUNAKAN METODE GEOMAGNET DENGAN PEMODELAN 2D DAN 3D Mars Widodo; Tony Yulianto; Udi Harmoko; Gatot Yulianto; Sugeng Widada; Yusuf Dewantoro
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research of analysis subsurface structure in Harjosari Semarang district using geomagnet methods with 2D and 3D modelling. In this study, magnetic data acquisition was carried out in 93 points by using a PPM (Proton Precession Magnetometer) geometrics type of GSM 19T and 2 units geotron magnetometer G5 models to get the values of the total magnetic field. The result of measurement data is processed by the daily variation correction and IGRF correction (International Geomagnetic Reference Field). The corrected data has been used to create total magnetic anomaly contour. The total magnetic anomaly contour has been used to process reduction to plan surface. The result of reduction to plan surface has been used to create a contour upward continuation and then made reduction to the poles. The result of research showed the total magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. Result of research an incision on the closure pair of positive and negative to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) using software Mag2DC. In 2D modeling result shows that was a fault zone below the surface about 210 to 1000 meters depth. The existence of the fault structure below the surface was estimated as a result of rock shifting from the northeastern area of research. Result of a 3-dimensional (3D) modelling using UBCMag3D software to determine subsurface structures more clearly by including error values, parameter values susceptibility and density models. On the results of the 3D display of subsurface structures found any difference in stark contrast to the susceptibility value at a depth of 225 meters to 1200 meters. The susceptibility value differences suspected presence of fault structures below the surface.
PEMODELAN INVERSI ANOMALI MAGNETIK 3D DAERAH MATA AIR PANAS DIWAK DAN DEREKAN Siti Zulaikhah; Udi Harmoko; Tony Yulianto; Gatot Yulianto; Sugeng Widada; Yusuf Dewantoro
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research of magnetic methods that aim to interpretation the subsurface structure around the hot springs area Diwak and Derekan and to identification caused of hot springs Diwak and Derekan has been successfully carried out. In this research, measurements were taken at 97 points using a proton precession magnetometer (PPM) type of GSM model 19T geometrics and two Geotron Magnetometer G5 models to get the value of the total magnetic field. Measurement data is processed by the daily variation correction and correction IGRF (International Geomagnetic Reference Field) to get the value of the total magnetic field anomaly. Corrected data used to create contours of the total magnetic field anomaly. Contour total magnetic field anomaly is used for the reduction to plan surface process and upward continuation process. The results of the upward continuation get the contours of local anomaly and regional anomaly, the results of the local anomaly contour then reduced to the pole. Results of the research is a pair of positive and negative closure indicate a fault structure below the surface. There are two pairs of positive and negative closure which an incision is made to determine the subsurface structure by creating a 2D model using the software Mag2dc. 2D modeling results indicate the existence of a second incision fault structure in the form of down trending fault southwest-northeast. Meanwhile, to make 3D models using software Mag3D and 3D modeling results indicate the presence of fault structures below the surface. Fault zone results of 2D and 3D modeling is a media outlet fluid to the surface in the form of hot springs Diwak and Derekan.
KARAKTERISASI CAP ROCK DAN RESERVOIR AREA GEOTERMAL X BERDASARKAN STUDI SEISMISITAS DENGAN METODE SED Anjar Oktikawati; Udi Harmoko; Imam Baru Raharjo
Youngster Physics Journal Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

X geothermal area is located in the western Indonesia with high seismicity. Microearthquake (MEQ) data in geothermal exploration usually used as one of tools for approximating permeable structure in geothermal reservoirand for determining boundaries of reservoir.Five seismic recording stations recorded the earthquake in the period October 2011 to December 2011. From 34671 records data stored on the period, only 68 events microearthquake (MEQ) are inverted to obtain the hypocenter with Single Event Determination method (SED).Result inversion of the method show that permeable zone at X geothermal area is located at 10000 to 22000 X axis and 5000 to 12000 Y axis. Depth distribution shows that cap rock is located about 580 meter to 1100 meter mean sea level and the reservoir is located at altitude about 600 meter to -2000 depth. Keywords: microearthquake (MEQ), hypocenter, SED, reservoir geothe.
INTERPRETASI SISTEM PANAS BUMI GUNUNG TELOMOYO BAGIAN UTARA KABUPATEN SEMARANG BERDASARKAN DATA GEOMAGNET Hiskia Anggit Maulana; Tony Yulianto; Udi Harmoko
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research has been carried out using the magnetic methods that have aim for interpret the subsurface structure of Telomoyo Mount geothermal field. The second aim is for analysis the model of Telomoyo Mount geothermal field previous.Magnetic data acquisition has been carried out in 83 points by using a couple of PPM (Proton Precession Magnetometer). Those are a PPM GSM19T model geometric is used looking for total magnetic anomaly and the second one is PPM G856X model that used as a base station. Then the result of acquisition data is processed by the daily correction and IGRF (International Geomagnetic Reference Field) correction. The corrected data is used to create total magnetic anomaly contour. Magnetic field that negative values is the research target and then do subsurface cross section that looking for visualization of conceptual geothermal model of Telomoyo Mount by processing of upward continuation and reduction to pole.The result of study showed a pair of positive and negative closure that indicating a fault under surface zone. In 2D modeling result is about 1400 meters depth. In 800 to 1400 meters depth can be interpret as a clay cap with a low susceptibility parameter that valued  -0.313 x 10-3 (SI-unit).Keywords: Geothermal, Telomoyo Mount, total magnetic field 
EVALUASI MODEL KECEPATAN HASIL METODE TOMOGRAFI REFLEKSI MENGGUNAKAN ATRIBUT KINEMATIK WAVEFIELD PADA DATA SEISMIK LAPANGAN AREA JAWA TIMUR LINE “Σ01” Galih Candra Kusuma; Teguh Suroso; Udi Harmoko
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

A commonly used tool for the construction of such velocity models is reflection tomography by velocity analysis. One of the drawbacks of that method is, however, that it requires picking of reflection events in the seismic prestack data to provide the traveltime information for the tomographic inversion. This picking is extremely time-consuming and can become difficult or even impossible if the signal-to-noise ratio in the data is low. In this study, other tomographic inversion is presented that use of traveltime information in the form of kinematic wavefield attributes. These attributes are the coefficients of second-order traveltime approximation by coherence analysis with the common-reflection-surface (CRS) stack. The research has been carried out with real seismic data of East Java area which has been processed until pre-processing. Process is started with determining kinematic wavefield attributes. Then, the attributes is calculated to get CRS stack. Based on the CRS stack, one can determine information about normal ray travel time, spatial coordinate, first spatial travel time derivatives or slowness, and second spatial travel time derivatives. That information is reconstructed by tomographic inversion modeling to get velocity model of subsurface structure. Initial model is constructed by defining the near surface velocity and velocity gradient as a function of depth. Tomographic inversion tries to minimize the misfit between  observed data and calculated modeling data. The final model is accepted if the misfit is already reached its minimum value. Apart from the tomographic inversion with kinematic wavefield attributes, data is also processed with conventional method to get velocity model by velocity analysis. Both of the velocity models then be compared. The advantages of using tomographic inversion method is to reduce subjectivity in generating velocity model for the process carried out using a mathematical calculation. Picking is further simplified by the fact that, the pick locations do not need to follow continuous of reflector events but are independent of each other and may be placed on locally coherent events. However, if the data input that used in tomographic inversion is bad, such as in this study, then the obtained velocity model  become less precise. Whereas the conventional method, the velocity values can be directed to obtain velocity model according to most likely section. Key words : velocity model, CRS stack, reflection tomography, kinematic wavefield attributes
Co-Authors . Sahid Achmad Syaifuddin Zuhri Achmad Widodo Aditya Firdaus Agung Ardiyanto Agus Muhidin Agus Muhidin Agus Setyawan Agus Subagio Akrima Amalia Alchacindy Guenergar Anjar Oktikawati Asronj Bakkit Simanjuntak Berkah Fajar Tamtomo Kiono Cassandra Fitrianna Idat Dewi Andri Dian L Silalahi Diny Agustina Rahayu Djalal Er Riyanto Elvera Yuanita Rukmana Faradina A. P. Fazrin Oktafian Galih Candra Kusuma Gatot Yulianto Hernowo Danusaputro Hiskia Anggit Maulana Hotlan Simbolon I Gusti Ngurah Antaryama Ibnu Rasid Imam Baru Raharjo Imroatun Nikmah Iqbal Takodama Irham Nurwidyanto Irvan Ramadhan Istiqomah Ari Kusuma Iut Triutami Ivan Darren Alber Iwan Gunawan Jaka Windarta Jatmiko Endro Suseno Jonius Christian Harefa Laela Fitria Lestari, Puspa Luxy Rizal Fathoni M. Razi Maila Shofa Marcelinus Christwardana Mars Widodo Moch. Abdul Mukid Mochammad Fa'iq Khasmadin Moh. Irfan Saputra Haris Mohammad Sidik Mualimin Mualimin Muhammad Irham Muhammad Irham Nurwidiyanto Muhammad Nur Muhammad Ulin Nuha ABA Mustafid Mustafid Nabil Bawahab Nanang Didik Susilo Nurwahyudin, Dindin Syarief Pradipta Ahluriza Ramdani Alfan Subekti Redemtus Heru Tjahjana Rezyta Handani Ririn Sulpiani Rizkan, Muhammad Riznia Aji Salam Rr. Tony Yulianto Saad Abdurrahman Sahid Sahid Satriyo Adhy Sheyza Rery Dynza Anggary Sigit Darmawan Siti Helmyati Siti Zulaikhah Sri Widodo Agung Suedy Sudarno Sudarno Sugeng Widada Susantoro, Tri M Syamsul Ilmi Teguh Suroso Teguh Suroso Tony Yulianto Triana Triana Veratania Aisyah Veratania Aisyah Vithya Arintalofa Wahyu Festiawan Nurrochim Yose Rizal Triarto Yundari, Yundari Yusuf D. H. Yusuf Dewantoro Herlambang