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

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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.
Appication of ZO-CRS Stack on Residual PP Removal of PS Component in Converted-Wave Sesimic Reflection Processing Triyoso, Wahyu; Irawan, Jefri B.; Viony, Natasha C.; Fatkhan, Fatkhan
Scientific Contributions Oil and Gas Vol 43, No 2 (2020)
Publisher : PPPTMGB "LEMIGAS"

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1547.926 KB) | DOI: 10.29017/SCOG.43.2.520

Abstract

A high-quality image of the PS component is needed since applying the converted-wave seismic method has increased significantly in hydrocarbon exploration, especially in interpreting the detail and complexity of structure or reservoir zones. The incident P-wave on a surface produces a reflected and converted P-S wave. Converted-wave seismic uses the multicomponent receiver that records both vertical and horizontal components. The vertical component is assumed to correspond to the compressional PP wave, and the horizontal corresponds to the PS converted-wave. To better understand how to image better the PS component, synthetic seismic data with the shallow gas and relatively complex model are constructed by the full-waveform modeling. This study aims to improve the imaging quality in the PS section to remove the residual PP events on the horizontal data refer to our previous study. In this study, to obtain the more reliable PS data, the residual PP reflections have been removed by applying the Zero Offset Common Reflection Surface (ZO CRS) Stack of the PS component. The results of this study, the imaging quality is better than that in the previous study.
RAY-BINNING ANGLE STACK DOMAIN IN ENHANCING THE ROBUSTNESS OF CONVERTED-WAVE SEISMIC JOINT INVERSION Triyoso, Wahyu; Oktariena, Madaniya; Muhtar, Lucky Kriski
Scientific Contributions Oil and Gas Vol 41, No 3 (2018)
Publisher : PPPTMGB "LEMIGAS"

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (750.31 KB) | DOI: 10.29017/SCOG.41.3.330

Abstract

Converted-Wave Seismic has been proven as imaging alternative in aiding conventional seismic data when passing through gas cloud accumulation. However, asymmetrical approximation effect during Converted-Wave Seismic binning still remains in offset domain. PS-Reflection events in offset-domain are mapped using common-ray re-sorting technique by implementing the basic Snells Law of Mode Conversion. This produces an Angle Profile correspondent with the PP incident angle. Re-sorting the angle of converted-wave ray path to the PP-Wave propagation within the common imaging point, the Converted-Wave seismic would share similar angle range. Thus, improving the match in PP to PS event as data input preparation for Joint Inversion. Grouping the angle based on AVA Analysis, followed by stacking the Angle Profile into Common-Ray Partial Angle Stack, had proven to eliminate the fault shadow sagging zone and gas absorption illumination area in Converted-Wave Seismic. The final result of PP-Seismic imaging is more coherent with the Converted-Wave Seismic, in term of event alignment and amplitude character. This result lead to more robust PP-PS Joint Inversion, as the coherency between input data is an important key in simultaneous process. The comparison on derived Vp/Vs shows better improvements of subsurface imaging, especially in the near-surface gas masking area of conventional seismic.
Co-Authors Awali Priyono Cecep Sulaeman Fatkhan Fatkhan Hilman Mardiyan Irawan, Jefri B. Lestari Cendekia Dewi Muhtar, Lucky Kriski Naibaho, Zael Yahd Xanggam Oktariena, Madaniya S. Supriyono Suwondo, Aris Viony, Natasha C.