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All Journal Journal of Engineering and Technological Sciences Jurnal Penelitian Pendidikan IPA (JPPIPA)
T. A. Sanny
Geophysical Engineering Department, Faculty Of Earth Science And Mineral Technology, Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40135, Phone/fax: (62) (22) 2509168
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology Physics

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Study on Rayleigh Wave Inversion for Estimating Shear-wave Velocity Profile Sanny, T. A.; Avianto, Yoes
Journal of Engineering and Technological Sciences Vol 35, No 1 (2003)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1067.003 KB) | DOI: 10.5614/itbj.eng.sci.2003.35.1.2

Abstract

Rayleigh wave or ground roll is a noise in seismic body waves. However, how to use this noise for soil characterization is very interesting since Rayleigh wave phase velocity is a function of compression-wave velocity, shear-wave velocity, density and layer thickness. In layered-medium Rayleigh wave velocity also depends on wavelength or frequency, and this phenomenon is called dispersion. Inversion procedure to get shear-wave velocity profile needs a priori information about the solution of the problem to limit the unknown parameters. The Lagrange multiplier method was used to solve the constrained optimization problems or well known as a smoothing parameter in inversion problems. The advantage of our inversion procedure is that it can guarantee the convergence of solution even though the field data is incomplete, insufficient, and inconsistent. The addition of smoothing parameter can reduce the time to converge. Beside numerical stability, the statistical stability is also involved in inversion procedure. In field experiment we extracted ground roll data from seismic refraction record. The dispersion curves had been constructed by applying f-k analysis and f-k dip filtering. The dispersion curves show the dependence of Rayleigh wave phase velocities in layered media to frequency. The synthetic models also demonstrate the stability and the speed of inversion procedure.
Study on Rayleigh Wave Inversion for Estimating Shear-wave Velocity Profile T. A. Sanny; Yoes Avianto
Journal of Engineering and Technological Sciences Vol. 35 No. 1 (2003)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2003.35.1.2

Abstract

Rayleigh wave or ground roll is a noise in seismic body waves. However, how to use this noise for soil characterization is very interesting since Rayleigh wave phase velocity is a function of compression-wave velocity, shear-wave velocity, density and layer thickness. In layered-medium Rayleigh wave velocity also depends on wavelength or frequency, and this phenomenon is called dispersion. Inversion procedure to get shear-wave velocity profile needs a priori information about the solution of the problem to limit the unknown parameters. The Lagrange multiplier method was used to solve the constrained optimization problems or well known as a smoothing parameter in inversion problems. The advantage of our inversion procedure is that it can guarantee the convergence of solution even though the field data is incomplete, insufficient, and inconsistent. The addition of smoothing parameter can reduce the time to converge. Beside numerical stability, the statistical stability is also involved in inversion procedure. In field experiment we extracted ground roll data from seismic refraction record. The dispersion curves had been constructed by applying f-k analysis and f-k dip filtering. The dispersion curves show the dependence of Rayleigh wave phase velocities in layered media to frequency. The synthetic models also demonstrate the stability and the speed of inversion procedure.
Karakterisasi tanah menggunakan pendekatan Electrical Resistivity Tomography (ERT) pada lahan non tipikal Ipomoea Batatas “Cilembu” Teuku Abdullah Sanny; Muhammad Luthfi Asrib; Arkan Zhafran Matin Insani
Jurnal Penelitian Pendidikan IPA Vol 9 No 8 (2023): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i8.4653

Abstract

The market demand for Cilembu sweet potato is increasing from year to year. Therefore it is necessary to develop Cilembu sweet potato land in other areas to solve this problem, including non-typical Cilembu sweet potato land. Investigations on the distribution of fertile soils are carried out on non-typical agricultural lands so that farmers can assess fertility problems in the soil, which can increase crop productivity. This specialty uses a high-precision agricultural approach to developing geophysical technology, one of which is Electrical Resistivity Tomography (ERT). This research was conducted to determine the characteristics of non-typical Cilembu sweet potato agricultural land in the Cicalengka sub-district. The results show that the resistivity values range from 10 to 800 Ωm, indicating that this area results from weathering of sedimentary rocks. The study results stated that the Cilembu variety of sweet potatoes could be developed on non-typical land in this area by considering the inhibiting factors. Knowing these inhibiting factors is expected to determine the steps in land management as a solution so that non-typical areas can help market demand for the availability of Cilembu sweet potato varieties.
Co-Authors Arkan Zhafran Matin Insani Muhammad Luthfi Asrib Yoes Avianto Yoes Avianto