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  • PESAN DAN TANGGAPAN :

    Seismolectric Presentation di Fisika UI
    Oleh : Mardan Zen
    Rabu, 20 Oktober 2004 (08:31 WIB) dari IP 152.118.24.3

    Dear Civitas Fisika UI,

    Dengan hormat,

    kami ingin memberitahukan bahwa besok, 20 Oktober 2004, akan diadakan
    presentasi dengan tema Seismoelectric, yang akan dibawakan oleh Bpk. MOHAMMAD
    S. ROSID, di Ruangan Seminar Utama, pkl. 13.00-15.00 WIB.

    Untuk itu , kami mengundang seluruh civitas akademika untuk menghadiri acara
    ini. Abstrak dan sedikit biografi pembicara dapat dibaca di bawah.

    Trims

    Geofisika UI



    ABSTRACT
    >
    >Seismoelectric methods are based upon physical properties of the earth
    that
    >produce electrical signals from seismic waves. The electrokinetic
    sounding
    >(EKS) is one such method that has great potential for hydrogeological
    >studies as it arises from the movement of pore fluids under seismic
    >excitation. In principle, the method should be able to directly map
    >changes in hydraulic permeability, rock porosity, or fluid-chemistry. A
    >number of researchers have recently tried to exploit the phenomenon in
    >groundwater problems where the conventional methods worked poorly.
    >However, publications of successful case histories to support the theory
    >are rare. This may be blamed upon the very weak amplitudes of the
    >electrical signals generated from the seismic wave which are millivolts to
    >nanovolts in magnitude, and the presence of cultural noise which is
    usually
    >much greater in magnitude.
    >
    >We demonstrate electrokinetic responses from formations more than 50
    metres
    >deep in two test areas in Western Australia. One is over a saline
    >paleochannel and the other over a freshwater aquifer. The seismic waves
    >were generated from a sledgehammer source and acoustic and electrical
    >signals recorded by a seismic acquisition system. Seismic refraction and
    >reflection data provide seismic velocity information for depth conversion
    >and support the seismoelectric data. The signals were then compared to
    >borehole logs to find what physical contrasts were detected. Significant
    >hydrogeological boundaries were detected up to 50 m deep in saline
    >groundwater conditions, and at least 80 m deep in freshwater aquifers. In
    >addition, we examine some pitfalls in the method and suggest methods to
    >overcome these problems.
    >
    >
    >
    >Short Biography
    >
    >MOHAMMAD S. ROSID is a PhD student working on "Groundwater Investigations
    >using the Seismoelectric Method" at the Department of Exploration
    >Geophysics, Curtin University of Technology, Perth.
    >He obtained his Master of Applied Geophysics in 1994 at the Bandung
    >Institute of Technology, Indonesia, and was Lecturer at Department of
    >Physics, University of Indonesia, Jakarta, from 1988 to now.
    >
    >His research interests include:
    > The seismoelectric method to probe for groundwater and near surface
    >exploration;
    > Electrical and electromagnetic method for groundwater engineering
    >studies;
    > Gravity and magnetic method for near surface and engineering studies; and
    > Geothermal exploration using integrated geophysical methods.
    >


    Regards,

    ======================================
    Mardan Zen
    ======================================
    Geofisika UI
    Kampus Depok 16424


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