Exploration Geophysics, near earth geophysics, Inversion, software development etc.

• Sulaiman Kayode Lawal

  Seepage

  I recently joined researchgate. My name is LAWAL, S.K. based in nigeria. Please i 'll like to know the best geophysical methods that can delineate more information about dam seepage.

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  • 
    Michel Chouteau replied

    SP is a good tool but the part caused by streaming potential is not so obvious since they are other sources of SP anomalies on a dam. I recommend (if possible) to monitor SP (time-lapse) changesSP is a good tool but the part caused by streaming potential is not so obvious since they are other sources of SP anomalies on a dam. I recommend (if possible) to monitor SP (time-lapse) changes during change in water level in the reservoir. Only the SP related to the electokinetic effect will vary to hydraulic head change. ERT is good to map the internal structure of the dam and is absolutely needed to invert the SP response. Temperature measurements are also an excellent indicator of dam seepage.

    19 days ago
• Muhammat Farit Suardi

  4D Seismic -Optimizing Hydrocarbon Recovery

  Hi All, Good day to you. I am organizing one masterclass course of 4D Seismic. It will be conducted by Professor Jakob Tjeerd Fokkema from Delft University and will taking place at Dubai,UAE. WouldHi All, Good day to you. I am organizing one masterclass course of 4D Seismic. It will be conducted by Professor Jakob Tjeerd Fokkema from Delft University and will taking place at Dubai,UAE. Would you be interested to know more about the masterclass and give some feedback? Send me your contact at muhammatfarit@ymail.com for me to send the full information. Muhammat Farit

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  • 
    Zhiguo Wang replied

    It's interesting. My address is emailwzg@gmail.com

    20 days ago
• Zufra Hassan

  What is concentric weathering and differential weathering?

  Can anybody explain the difference between concentric weathering and differential weathering and how resistivity values vary with both types of weathering? Is vein quartz subjected to concentricCan anybody explain the difference between concentric weathering and differential weathering and how resistivity values vary with both types of weathering? Is vein quartz subjected to concentric weathering or differential weathering?

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    Zufra Hassan replied

    I am extremely grateful to you all. Obviously, it cleared my confusion. Thank you very much.

    Apr 20, 2012
• Zufra Hassan

  Literature surveys on delineating vein quartz from bed rock and weathering patterns

  Can anyone recommend research articles on 2D resistivity regarding mineral exploration and their different weathering patterns.

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    Ekaterina Vsemirnova replied

    Hi, EAGE Near Surface Geophysics 2007 publication: "Resistivity imaging in steep and weathered terrains" by Mendoza & Dahlin. If sounds interesting I can get you full text. Abstract: In areas whereHi, EAGE Near Surface Geophysics 2007 publication: "Resistivity imaging in steep and weathered terrains" by Mendoza & Dahlin. If sounds interesting I can get you full text. Abstract: In areas where tectonics and weathering have hydrogeological significance, electrical methods can assist in mapping the subsurface. In this work, resistivity imaging was used to map fractures, faults and quartz veins emplaced in strongly weathered volcanic rocks. The aim was to map geological units related to the formation of groundwater systems in the Río Artiguas basin, Nicaragua. Eight 2D resistivity surveys selected from two sites with characteristic geological features are discussed in this article. The resistivity lines were carried out with a multi-electrode system together with different electrode geometries. The data inversion was done by applying the robust (L1-norm) method and a finite element grid to accommodate the steep topography. The data interpretation included numerical modelling to assess the suitability of all used electrode arrays in relation to the expected geological settings. The results indicated a top high resistive layer consisting of colluviums with laterite (>50 Ω m), underlain by conductive clay weathered layers (10–50 Ω m). Below the conductive layer less weathered or fresh rock can be found with higher values (50–600 Ω m). The quartz veins and dykes stand out as the highest resistive bodies (100–4000 Ω m). The results indicated an overall weathering thickness of 10–30 m or more. In conclusion, the extensive resistivity imaging surveys allowed delineation of geological structures and weathering layers throughout the study area. Furthermore, the vertical extension of weathering was examined at all locations. A finite element grid in the inversion prevented distortions arising from topography regardless of the steep slope observed at the survey locations. The numerical modelling results revealed the strengths of different arrays for the particular cases of a fault and a quartz vein in irregular terrains.

    Apr 5, 2012
• Khalid Kheiralla

  Can anyone guide me to some literature on Seismic Vulnerability Indices for Ground and Structure using Micro tremor?

  Can anyone guide me to some literature on Seismic Vulnerability Indices for Ground and Structure using Microtremor?

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    Ehsan Rostami replied

    Dear khalid i think seismic vulnerability indices first introduced by nakamora,1997, "seismic vulnerability indices for ground and structures using microtremor" , i have some papers that can beDear khalid i think seismic vulnerability indices first introduced by nakamora,1997, "seismic vulnerability indices for ground and structures using microtremor" , i have some papers that can be helpful for you if you want. Regards

    Apr 3, 2012
• Harshee Perera

  Can anyone guide me to some literatures on rare earth element analysis in gem bearing areas in Sri Lanka?

  The Common rare earth elements presents in gem mines in Sri Lanka. The methods of sample collection. The sample analysis methods for analyzing rare earth elements.

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    Harshee Perera replied

    Thank you very much for the link.

    Feb 11, 2012
• Bervin Gumbo

  Heuristic.. How do i find a kimberlite pipe.

  diamond exploration

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    Charles Meuse replied

    Here in the north america they look for traces of diamond and or green garnets in the soil, finding these they follow them northward (glaciers most likely carried them) to the source.

    Jan 17, 2012
• Harshee Perera

  How the indicator mineral is identified in the gem bearing area?

  This should be linked with rare earth elements analysis of gem bearing ares
• Debangshu Banerjee

  Can anyone guide me to some literatures on tectonics off ECMI with reference to 85E ridge?

  The offshore tectonics of Easten Continental Margin of India between Kalingapatnam and Kakinada is of interest especially with respect to any new findings/neotectonic adjustments in the area. AnyThe offshore tectonics of Easten Continental Margin of India between Kalingapatnam and Kakinada is of interest especially with respect to any new findings/neotectonic adjustments in the area. Any guidelies to this effect is highly solicited.
• Shazia Naseem

  Any body working on Pakistan offshore seismic 2D data interpretation?

  Any information about the subsurface formations, structures like incised valleys or channels and if any study of seismic stratigraphy being carried out for that area.

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    Suman Kilaru replied

    Read geology of the study area.Geophysicist give information about all physical properties of formations(some formations/rocks contain same physical properties) by using the different methods,Read geology of the study area.Geophysicist give information about all physical properties of formations(some formations/rocks contain same physical properties) by using the different methods, but it is not enough to understand the subsurface lithography when you understand the study area geology, then you can do processes your data very easily in any method to make apparent model of the study area

    Nov 30, 2011
• Dhanam Kusireddi

  Is anybody interested in High resolution seismic?

  I am working on high resolution seismic for coal exploration, i want to discuss people who are working in this field.
• Panu Mon

  What is Google Earth's projection?

  Google Earth use Projection UTM or Mercator projection or GCS or other?

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    Stefan Schloemer replied

    You better start reading a good textbook as soon as possible. You are mixing up things terribly! UTM and GCS are not projections but coordinate systems.

    Nov 6, 2011
• Emmanuel Arimor Avula

  Geo-Informatics

  Hi all, I am a surveyor currently based in the UK. I have intrest in surveying, GIS and Geodesy and Hydrography. I'll be happy to discuss with people with common interest.

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    Raghavan Rajagopal Bangalore replied

    Dear Weiyong, sure, we could communicate. I too have an M.Sc., and Ph.D., in marine geology. However, I shifted to coeanography of shallow waters.

    Oct 10, 2011
• Dr. Gajanan D. Kamde

  Does geophysical and geomagnetic methods help to locate metallic deposited ?

  If yes, i want to know about methodlogy and excact field procedure to locate the metallic deposites such as iron ore, manganese etc.

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    Ahmad Alrashid replied

    I love geopyhsic ! by the way, I studied gravity method in my university, there is a discussion. What differ Gravity method and Microgravity? (beside its scale of course) Some says microgravity isI love geopyhsic ! by the way, I studied gravity method in my university, there is a discussion. What differ Gravity method and Microgravity? (beside its scale of course) Some says microgravity is used for monitoring, rather than surveying, and some says it is the accuracy of the CG 3 which make microgravity more accurate (but this is for surveying) .... PLease coorect me if i have misperception or misunderstanding : )

    Oct 4, 2011
• Peimin Zhu

  Who is studying the moon?

  Hello, My name is Peimin. I am glad to meet you at Research Gate and woluld discuss the seismic problem with you.

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    Ahmed Dag replied

    Very intersting ... what kind of reaserch are you trying to do ... what kind of inversion method do you use? and why?

    Sep 7, 2011