Free‐surface multiple attenuation using inverse data processing in the coupled plane‐wave domain: Field data example

2009 ◽  
Author(s):  
Jitao Ma ◽  
Mrinal K. Sen ◽  
Xiaohong Chen
Keyword(s):  
Free Surface ◽  
Plane Wave ◽  
Data Processing ◽  
Field Data ◽  
Multiple Attenuation

Free-surface multiple attenuation using inverse data processing in the coupled plane-wave domain

Geophysics ◽  
2009 ◽  
Vol 74 (4) ◽  
pp. V75-V81 ◽  
Author(s):  
Jitao Ma ◽  
Mrinal K. Sen ◽  
Xiaohong Chen
Keyword(s):  
Free Surface ◽  
Plane Wave ◽  
Data Processing ◽  
Synthetic Data ◽  
Primary Energy ◽  
Matrix Inversion ◽  
Data Matrix ◽  
Inversion Method ◽  
Multiple Attenuation ◽  
Invariant Embedding

Free-surface multiples contain a large amount of energy in the seismic data because of large reflectivity of the free surface. We propose a method for free-surface multiple attenuation by a simple muting in the inverse coupled plane-wave domain. Our method is based on inverse data processing and the well-known 2D invariant embedding technique. If the lateral variation in subsurface structure is smooth, the data are well compressed in the 2D coupled plane-wave domain, reducing computation costs and stabilizing the inversion procedure. Surface multiples and primaries are well separated in the inverse coupled plane-wave domain, and multiples can be eliminated by simple muting, which does not damage the primary energy. To reduce artifacts, wraparound, and noise introduced by the frequency-domain data matrix inversion, horizontal and vertical tapers are applied. A least-squares matrix inversion method is chosen to stabilize the inversion. Synthetic data examples show that plane-wave inverse data processing is stable and successful in attenuating free-surface multiples.

scholarly journals PRODUKTIVITAS ALAT BERAT DAN BIAYA PELAKSANAAN PEKERJAAN PADA PROYEK PEMELIHARAAN BERKALA RUAS JALAN: SUNGAI LAKUM – PASAR KAMIS (KERTAK HANYAR)

INFO-TEKNIK ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 103
Author(s):  
Aulia Isramaulana ◽  
Rizka Norjanah
Keyword(s):  
Theoretical Analysis ◽  
Data Processing ◽  
Field Data ◽  
Unit Price ◽  
Base Layer ◽  
Class A ◽  
Heavy Equipment ◽  
Periodic Maintenance ◽  
Class B ◽  
Aggregate Base

On the project Periodic Maintenance of Road Sungai Lakum Pasar Kamis is a project implemented using heavy equipment. By using heavy equipment, will facilitate and accelerate the course of the project. The tools used must be considered maintenance, because it is very influential on the production tools and costs incurred for the use of the tool. This study aims to analyze the use of heavy equipment in the periodic Maintenance Project of road Sungai Lakum Pasar Kamis by using theoretical analysis based on field data. Analyzing the calculation is the productivity and cost of the equipment on the scope of work that is the work of the land, widening work and road shoulder work, grinding pavement work, and asphalt work, using Excel program as a tool in data processing so that the achievement of the use of heavy equipment available in finish the job. Based on the calculation obtained the price of theoretical analysis unit based on field data for the work of preferred stockpiles from the source of Rp. 310.994.714,2; Class B aggregate base layer Rp. 76.127.086,04; Aggregate base layer with hill excavation Rp. 59.705.050,39; Class A base aggregate layer Rp. 204.703.029,9; Asphalt lining resap coat liquid Rp. 3.038.436,28; Lataston coating foundation Rp. 306.997.682,6. Where the calculation of unit price based on field data is smaller than the unit price of the bid data.

scholarly journals Geomagnetic anomaly associated with Fukushima earthquake on February 13th, 2021

2021 ◽  
Vol 331 ◽  
pp. 07012
Author(s):  
Cipta Ramadhani ◽  
Bulkis Kanata ◽  
Abdullah Zainuddin ◽  
Rosmaliati ◽  
Teti Zubaidah
Keyword(s):  
Data Processing ◽  
Geomagnetic Field ◽  
Field Data ◽  
Low Frequency ◽  
Earthquake Precursors ◽  
Polarization Ratio ◽  
Magnetic Polarization ◽  
Central Frequency ◽  
Electromagnetic Data ◽  
Geomagnetic Anomaly

In this study, we performed research on electromagnetic anomalies related to earthquakes as early signs (precursors) that occurred in Fukushima, Japan on February 13th, 2021. The research focused on the utilization of geomagnetic field data which was derived from the Kakioka (KAK), Kanoya (KNY), and Memambetsu (MMB) observatories, particularly in the ultra-low frequency (ULF) to detect earthquake precursors. The method of electromagnetic data processing was conducted by applying a polarization ratio. In addition, we improved the methodology by splitting the ULF data (which ranged from 0.01-0.1 Hz) into 9 central frequencies and picking up the highest value from each central frequency to get the polarization ratio. The anomaly of magnetic polarization was identified 2-3 weeks before the mainshock in a narrowband frequency in the range of 0.04-0.05 Hz.

Dip selective 2-D multiple attenuation in the plane‐wave domain

Geophysics ◽  
2000 ◽  
Vol 65 (1) ◽  
pp. 264-274 ◽  
Author(s):  
Faqi Liu ◽  
Mrinal K. Sen ◽  
Paul L. Stoffa
Keyword(s):  
Plane Wave ◽  
Source Function ◽  
Real Data ◽  
Wave Theory ◽  
Geological Structure ◽  
Multiple Attenuation ◽  
Invariant Embedding ◽  
Free Data ◽  
Air Water Interface ◽  
Lateral Variations

In many geological settings, strong reflections at the air‐water interface contribute to most of the multiple energy in the recorded seismograms. Here, we describe a method for free‐surface multiple attenuation using a reflection operator model of a seismic record, derived using the well‐known invariant embedding technique. We implement this method in the 2-D plane‐wave domain, where lateral variation of the geological structure of the earth is taken into account by the coupling of different ray parameters. In situations where the lateral variations are smooth, the data are well compressed in the 2-D plane‐wave domain and the resultant bandlimited matrices significantly reduce the computation cost. One important feature of the proposed method is its flexibility, which allows for the removal of multiples from selected reflections. To generate multiple free data, wave‐theory‐based multiple attenuation methods attempt to estimate either the source function or the subsurface reflectivity. Our method takes advantage of both approaches, such that we initially predict multiple traveltime using the reflectivity approach and then seek a source function to predict the amplitudes. Synthetic and real data examples show that this method is stable and successful in attenuating the surface multiples.

PENGARUH KINERJA, MOTIVASI, DAN KOMPENSASI TERHADAP DISIPLIN KERJA OUSOUCING UNIT ATMRC PT BNI PERSERO TBK KANTOR WILAYAH PALEMBANG

2021 ◽  
Vol 2 (2) ◽  
pp. 223-234
Author(s):  
Gunawan Putrado ◽  
Fakhry Zamzam ◽  
Neny Rostiati
Keyword(s):  
Data Collection ◽  
Data Processing ◽  
Research Method ◽  
Field Data ◽  
Analysis Tool ◽  
Regional Office ◽  
Field Data Collection ◽  
Representative Office

The purpose of this study was to determine the effect, motivation and compensation on work discipline of employees of the Outsourcing Atmrc Unit of PT BNI Persero Tbk Palembang Regional Office partially or simultaneously. This research method uses survey and verification descriptives, field data collection uses questionnaires, interviews and documentation. This research is an associative research, where in this study there are variables that are related and can influence other variables. The population of this study were 62 employees of the BPKP Representative Office Auditor, South Sumatra Province. Data processing using SPSS 25 analysis tool. The results of the study stated that performance had an effect on work discipline, there was an effect of motivation on work discipline, compensation had an effect on work discipline. Performance, Motivation and Compensation affect Discipline simultaneously

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