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All Journal IJOG : Indonesian Journal on Geoscience KURVA S JURNAL MAHASISWA Journal of Engineering and Technological Sciences Indonesian Journal on Geoscience Indonesian Journal on Geoscience Scientific Contributions Oil and Gas
Triyoso, Triyoso
Program Studi Ilmu Keperawata Fakultas Kedokteran Universitas Malahayati Bandar Lampung
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Energy Engineering

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Karakterisasi sumber gempa Yogyakarta 2006 berdasarkan data GPS Sulaeman, Cecep; Dewi, Lestari Cendekia; Triyoso, Wahyu
Indonesian Journal on Geoscience Vol 3, No 1 (2008)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.776 KB) | DOI: 10.17014/ijog.v3i1.47

Abstract

http://dx.doi.org/10.17014/ijog.vol3no1.20085The southern part of Central Jawa is one of earthquake hazard prone areas in Indonesia an earthquake occurred on May 27, 2006 and had the moment magnitude 6.3. Base on the GPS observation, the characterization of the epicenter and source of this Yogyakarta earthquake can be estimated using the displacement estimation and strain at the measurement point by using a simple kriging and sequential gaussian simulation method. The direction of the displacement and maximum shear strain anomaly in this research was shown by the fault of SW – NE direction and the displacement pattern shows that this fault is left lateral strike slip movement. The positive anomaly of the maximum shear strainis located about 10 km east of Bantul, which suggests as the position of Yogyakarta 2006 earthquake source, with the moment seismic and moment magnitude values are 8.1385 x 1025 dyne cm, and 6.5 respectively.    
Velocity versus Offset (VVO) Estimation Using Local Event Correlation and Its Application in Seismic Processing & Analysis Supriyono, S.; Priyono, Awali; Triyoso, Wahyu; Mardiyan, Hilman
Journal of Engineering and Technological Sciences Vol 45, No 2 (2013)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (559.019 KB) | DOI: 10.5614/j.eng.technol.sci.2013.45.2.2

Abstract

Conventional velocity analysis is usually done in a relatively spare grid, for instance every half kilometers, during the processing of seismic data. It is very laborious work and very subjective. To deliver an accurate velocity picking, processing geophysicists must have a good understanding of geological background of area being analyzed and experiences. Velocity errors often occur during picking. Proper quality control and checking are a must. A good and reliable velocity field is very important in seismic processing for achieving high-quality seismic images as well as for delivering an accurate depth conversion. The new method presented here, was developed to correct velocity errors automatically by means of residual velocity correction, and to produce an offset-dependent RMS velocity field at the same time. The method is data driven, based on the normal move out equation (NMO) and measuring the local even correlation between adjacent traces. The stacking velocity is derived simply by averaging the velocity field. The proposed method was tested on synthetic and real data examples with good result. The velocity field has certain characteristics related to hydrocarbon presence. Supriyono (2011 and 2012) developed a new DHI method using velocity gradient attributes by cross-plotting the velocity versus offset (VVO). The velocity gradient exhibits high anomalous values in the presence of gas.
MANAJEMEN RISIKO KONTRAK KONSTRUKSI PADA SISTEM UNIT PRICE TERHADAP PROYEK PEMBANGUNAN FLY OVER JALAN JUANDA-ABDUL WAHAB SYAHRANI DI SAMARINDA TRIYOSO, AGUNG
KURVA S JURNAL MAHASISWA Vol 1, No 1 (2016)
Publisher : KURVA S JURNAL MAHASISWA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (87.995 KB)

Abstract

INTISARI : Saat ini dengan membaiknya perekonomian Indonesia, khususnya di wilayah Kalimantan Timur, Samarinda menjadi pusat bisnis property dalam bentuk apartemen, real estate dan masih banyak macam lainnya, ada beberapa jenis tipe kontrak secara garis besar dan yang sering di gunakan oleh owner yaitu system kontrak lump sum dan unite price. Dari hal-hal yang telah dijelaskan diatas tampak bahwa masing-masing tipe kontrak memiliki kelebihan dan kekurangan yang perlu dijadikan bahan pertimbangan oleh kontraktor untuk menentukan tindakan dalam mengatasi risiko. Sistem yang digunakan untuk mengelola risiko agar dampaknya tidak berpengaruh terlalu besar pada tujuan proyek dinamakan sistem manajemen risiko.            Masalah yang ingin diteliti adalah bagaimana identifikasi risiko kotrak pembangunan fly-over ? dan bagaimana tingkat risiko kontrak pada proyek pembangunan fly-over bagi kontraktor pelaksana.   Metode penelitian yang digunakan adalah deskripsi perhitungan tingkat risiko menggunakan metode matrik probabilitas-dampak, lokasi dalam penelitian ini yaiti di Jalan Juanda – Abdul wahab syahrani di samarinda. Berdasarkan hasil tingkat risiko kontrak didapat 6 indikator risiko yang signifikan terhadap proyek. Yaitu Harga perkiraan sementara (HPS) dari owner, nilai proyek, jadwal pelaksanaan, system kontrak, hubungan proyek ini dengan proyek lain, keahlian dalam membuat RAB. Sedangkan risiko yang sangat berpengaruh terhadap kontrak ada 12 variabel berisiko.
Earthquake Potential Hazard Analysis of Palembang City, Sumatra Island Triyoso, Wahyu; Suwondo, Aris; Naibaho, Zael Yahd Xanggam
Indonesian Journal on Geoscience Vol 8, No 1 (2021): in-press
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.1.1-9

Abstract

Most of the destructive earthquakes in Sumatra are dominated by thrust mechanisms that occur due to the process of subduction and some earthquakes with strike-slip fault sources such as the Sumatra fault and northwestern Sumatra. The subduction zones along western Sumatra and Sumatran fault zones are active seismic sources of earthquake events. The seismotectonics of South Sumatra can be affected by earthquakes triggered by these seismic sources. In this study, an estimation and analysis of the potential for earthquake hazard curves were carried out in Palembang City due to the influence of subduction zone sources, strike-slip faults, and intermediate to deep earthquake sources. The algorithm of the seismicity smoothing was applied to estimate the seismicity rate for megathrust sources, active faults, and intermediate to deep earthquake sources. The results of the earthquake hazard potential curve showed that the estimated Peak Ground Acceleration (PGA) in the bedrock of the subduction earthquake sources was greater than the estimated ground shaking due to strike-slip fault sources as well as intermediate to deep earthquake sources. To understand better the potential ground shaking, the evaluation of PGA at the surface was then estimated by including the amplification factor. The amplification factor was calculated using the Horizontal-Vertical Spectral Ratio (HVSR) method. Based on the PGA estimated at the surface of 10% probability exceedance level during 50 years, the Palembang City has a potential shaking of around 35 gal, which is likely to be caused by a megathrust earthquake source.
Earthquake Potential Hazard Analysis of Palembang City, Sumatra Island Triyoso, Wahyu; Suwondo, Aris; Naibaho, Zael Yahd Xanggam
Indonesian Journal on Geoscience Vol 8, No 1 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1101.548 KB) | DOI: 10.17014/ijog.8.1.1-9

Abstract

DOI: 10.17014/ijog.8.1.1-9Most of the destructive earthquakes in Sumatra are dominated by thrust mechanisms that occur due to the process of subduction and some earthquakes with strike-slip fault sources such as the Sumatra fault and northwestern Sumatra. The subduction zones along western Sumatra and Sumatran fault zones are active seismic sources of earthquake events. The seismotectonics of South Sumatra can be affected by earthquakes triggered by these seismic sources. In this study, an estimation and analysis of the potential for earthquake hazard curves were carried out in Palembang City due to the influence of subduction zone sources, strike-slip faults, and intermediate to deep earthquake sources. The algorithm of the seismicity smoothing was applied to estimate the seismicity rate for megathrust sources, active faults, and intermediate to deep earthquake sources. The results of the earthquake hazard potential curve showed that the estimated Peak Ground Acceleration (PGA) in the bedrock of the subduction earthquake sources was greater than the estimated ground shaking due to strike-slip fault sources as well as intermediate to deep earthquake sources. To understand better the potential ground shaking, the evaluation of PGA at the surface was then estimated by including the amplification factor. The amplification factor was calculated using the Horizontal-Vertical Spectral Ratio (HVSR) method. Based on the PGA estimated at the surface of 10% probability exceedance level during 50 years, the Palembang City has a potential shaking of around 35 gal, which is likely to be caused by a megathrust earthquake source.
The use of the Common Offset of the Common Reflection Surface (CO-CRS) for Velocity Analysis and Data Preconditioning Triyoso, Wahyu; Hutapea, Fernando Lawrens
Scientific Contributions Oil and Gas Vol 48 No 4 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i4.1935

Abstract

This study introduces a Common Offset (CO) extension of the Common Reflection Surface (CRS) method to address seismic imaging challenges in complex geological settings and with noisy data. This CO-CRS approach aims to enhance the signal-to-noise ratio and overcome the limitations of conventional preconditioning techniques that rely on accurate parameterization. Building upon established work on zero-offset CRS (ZO-CRS), the CO method generates regularized prestack data suitable for both time- and depth-domain processing by interpolating missing offsets using a local hyperbolic approximation. Ultimately, this study utilizes CO-CRS for enhanced velocity analysis and data preconditioning prior to performing prestack time migration (PSTM). In this study, the CO-CRS is then used for velocity analysis and prestack time migration. The results show that prestack CO-CRS data yield improved time-migrated seismic images, and we suggest extending the application to the depth domain. To achieve a reliable velocity model for imaging, recursive seismic inversion (RSI) is applied to derive the velocity model using the PSTM stack and a velocity interval time, based on CRS semblance velocity analysis. Furthermore, the prestack depth migration (PSDM) is then tested. The depth-imaging results are reliable, and it can be concluded that combining the benefits of the CRS noise-reduction feature with more accurate velocity analysis and prestack migration can provide enhanced capabilities.
Co-Authors Awali Priyono Cecep Sulaeman Fatkhan Fatkhan Hilman Mardiyan Hutapea, Fernando Lawrens Irawan, Jefri B. Lestari Cendekia Dewi Muhtar, Lucky Kriski Naibaho, Zael Yahd Xanggam Oktariena, Madaniya S. Supriyono Suwondo, Aris Viony, Natasha C.