The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform

Tapan Mukerji - One of the best experts on this subject based on the ideXlab platform.

  • fast 3d ultra shallow seismic reflection imaging using portable Geophone mount
    Geophysical Research Letters, 2001
    Co-Authors: Ran Bachrach, Tapan Mukerji
    Abstract:

    We present the results of three different seismic experiments designed to develop and evaluate the use of 3D Ultra Shallow Seismic Reflection for high-resolution near-surface imaging. A feasibility study and the first implementation of a 2D portable Geophone mount for fast and cost-effective ultra-shallow 3D seismic data acquisition are discussed. The portable Geophone mount is made out of an anelastic base with a frame and an array of 72 Geophones spaced with an interval of 0.25m both in the inline and crossline direction. The array enables acquisition of very high-resolution 3D data cubes with bin size of 12.5 × 12.5cm and wavelets of 350Hz. The time for re-planting the 72-channels portable Geophone mount is about 5min in the field. Thus, we show that high-resolution near-surface 3D images can be obtained fast and in a cost-effective manner. This has the potential of providing effective solutions for many geotechnical and geoenvironmental applications.

  • fast 3d ultra shallow seismic reflection imaging using portable Geophone mount
    14th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2001
    Co-Authors: Ran Bachrach, Tapan Mukerji
    Abstract:

    In this paper we present the results of a suite of seismic experiments designed to develop and evaluate the use of 3D Ultra Shallow Seismic Reflection System for high resolution near surface imaging. A feasibility study and the first implementation of 2D portable Geophone mounted array for fast and cost effective ultra shallow 3D seismic data acquisition are discussed. The new portable Geophone mount is made out of anelastic base with a frame and 72 Geophones spaced in an array. Geophone interval of 0.25m both in the inline and crossline direction enables acquisition of very highresolution 3D data cubes with bin size of 12.5x12.5cm and wavelets of 350Hz. The time of re-planting the 72 channels portable Geophone mount is about 5min in the field. We also developed a data acquisition quality control and real time imaging that can be preformed on a portable computer in the field and produce 3D images in real time. Thus, we show that high-resolution near-surface 3D seismic images can be obtained rapidly, and in a cost-effective manner. This has the potential of providing effective solutions for many geotechnical and geoenvironmental applications.

Ran Bachrach - One of the best experts on this subject based on the ideXlab platform.

  • fast 3d ultra shallow seismic reflection imaging using portable Geophone mount
    Geophysical Research Letters, 2001
    Co-Authors: Ran Bachrach, Tapan Mukerji
    Abstract:

    We present the results of three different seismic experiments designed to develop and evaluate the use of 3D Ultra Shallow Seismic Reflection for high-resolution near-surface imaging. A feasibility study and the first implementation of a 2D portable Geophone mount for fast and cost-effective ultra-shallow 3D seismic data acquisition are discussed. The portable Geophone mount is made out of an anelastic base with a frame and an array of 72 Geophones spaced with an interval of 0.25m both in the inline and crossline direction. The array enables acquisition of very high-resolution 3D data cubes with bin size of 12.5 × 12.5cm and wavelets of 350Hz. The time for re-planting the 72-channels portable Geophone mount is about 5min in the field. Thus, we show that high-resolution near-surface 3D images can be obtained fast and in a cost-effective manner. This has the potential of providing effective solutions for many geotechnical and geoenvironmental applications.

  • fast 3d ultra shallow seismic reflection imaging using portable Geophone mount
    14th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2001
    Co-Authors: Ran Bachrach, Tapan Mukerji
    Abstract:

    In this paper we present the results of a suite of seismic experiments designed to develop and evaluate the use of 3D Ultra Shallow Seismic Reflection System for high resolution near surface imaging. A feasibility study and the first implementation of 2D portable Geophone mounted array for fast and cost effective ultra shallow 3D seismic data acquisition are discussed. The new portable Geophone mount is made out of anelastic base with a frame and 72 Geophones spaced in an array. Geophone interval of 0.25m both in the inline and crossline direction enables acquisition of very highresolution 3D data cubes with bin size of 12.5x12.5cm and wavelets of 350Hz. The time of re-planting the 72 channels portable Geophone mount is about 5min in the field. We also developed a data acquisition quality control and real time imaging that can be preformed on a portable computer in the field and produce 3D images in real time. Thus, we show that high-resolution near-surface 3D seismic images can be obtained rapidly, and in a cost-effective manner. This has the potential of providing effective solutions for many geotechnical and geoenvironmental applications.

Robert R Stewart - One of the best experts on this subject based on the ideXlab platform.

  • seismic surveying with drone mounted Geophones
    Conference on Automation Science and Engineering, 2016
    Co-Authors: Srikanth K V Sudarshan, Li Huang, Robert R Stewart, Aaron T Becker
    Abstract:

    Seismic imaging is the primary technique for subsurface exploration. Traditional seismic imaging techniques rely heavily on manual labor to plant sensors, lay miles of cabling, and then recover the sensors. Often sites of resource or rescue interest may be difficult or hazardous to access. Thus, there is a substantial need for unmanned sensors that can be deployed by air and potentially in large numbers. This paper presents working prototypes of autonomous drones equipped with Geophones (vibration sensors) that can fly to a site, land, listen for echoes and vibrations, store the information on-board, and subsequently return to home base. The design uses four Geophone sensors (with spikes) in place of the landing gear. This provides a stable landing attitude, redundancy in sensing, and ensures the Geophones are oriented perpendicular to the ground. The paper describes hardware experiments demonstrating the efficacy of this technique and a comparison with traditional manual techniques. The performance of the seismic drone was comparable to a well planted Geophone, proving the drone mount system is a feasible alternative to traditional seismic sensors.

  • Geophone and mems accelerometer comparison at spring coulee alberta
    2009
    Co-Authors: Michael S Hons, Robert R Stewart
    Abstract:

    Summary Multicomponent seismic data, from a Geophone and accelerometer test at Spring Coulee, Alberta, are compared and inspected for frequency content and differences in signal-to-noise ratio (SNR). Amplitude spectra show general similarity between Geophones and accelerometers with differences in ambient noise appearing to be consistent with the theoretical modeling. Estimating the SNR at far offsets by comparing ambient noise to reflection energy suggests a small advantage for Geophones at low frequencies (<20 Hz), and a small advantage for MEMS accelerometers above 150 Hz. Further analysis of NMO-corrected receiver gathers shows there is greater frequency content in the MEMS accelerometer gathers at high frequencies, but the a phase coherency analysis shows that the bandwidth of coherent information is very similar.

  • comparison of mems accelerometers and Geophones at spring coulee alberta
    2008
    Co-Authors: Michael S Hons, Robert R Stewart
    Abstract:

    Geophone and MEMS accelerometer data from a field experiment at Spring Coulee, Alberta are compared in the acceleration domain. At receiver stations where coupling and noise are not a problem, measurements from both sensor types are found to be very similar. Several different analyses of signal-to-noise ratio indicate a small advantage for Geophones at low and medium frequencies, at later arrival times and longer offsets. Accelerometers appear to have a small advantage at higher frequencies, shorter arrival times and shorter offsets.

  • ground motion through Geophones and mems accelerometers sensor comparison in theory modeling and field data
    Seg Technical Program Expanded Abstracts, 2007
    Co-Authors: Michael S Hons, Don C. Lawton, Robert R Stewart, Malcolm B. Bertram
    Abstract:

    Summary Digital sensors based on micro electro mechanical systems (MEMS) accelerometers are one of the newest technologies being used in seismic acquisition. As such, some confusion remains surrounding similarities and differences relative to the coil-over-magnet Geophone. An understanding of the functioning of these sensors and how to compare them can be facilitated by deriving transfer functions, which relate the data acquired through each sensor to actual ground motion. An equation is then derived to calculate acceleration comparable to unprocessed MEMS data from unprocessed Geophone data. The inverse of this equation may be used to calculate Geophone data from MEMS data. The effects of sensors on zero and minimum phase wavelets are modeled, demonstrating that the raw output from the sensors should be similar. The minimum phase wavelets are convolved with a random reflectivity series to test deconvolution of impulsive source data. Deconvolution produces Geophone and MEMS processed traces that appear similar, and constant phase rotation of MEMS data after deconvolution cannot correct all remaining differences. The Geophone-to-MEMS transfer equation will exactly transfer between sensors only in the absence of instrument noise. Comparisons between MEMS and Geophones recording the same shots, and ground motion domains calculated from those records, show that the data is very similar in frequency content when the same domain is considered, and MEMS records will not necessarily have a larger magnitude contribution from low frequencies than

Zhenhua Huang - One of the best experts on this subject based on the ideXlab platform.

  • a low cost energy efficient cableless Geophone unit for passive surface wave surveys
    Sensors, 2015
    Co-Authors: Kaoshan Dai, Qingyu You, Zhenhua Huang
    Abstract:

    The passive surface wave survey is a practical, non-invasive seismic exploration method that has increasingly been used in geotechnical engineering. However, in situ deployment of traditional wired Geophones is labor intensive for a dense sensor array. Alternatively, stand-alone seismometers can be used, but they are bulky, heavy, and expensive because they are usually designed for long-term monitoring. To better facilitate field applications of the passive surface wave survey, a low-cost energy-efficient Geophone system was developed in this study. The hardware design is presented in this paper. To validate the system's functionality, both laboratory and field experiments were conducted. The unique feature of this newly-developed cableless Geophone system allows for rapid field applications of the passive surface wave survey with dense array measurements.

Michael S Hons - One of the best experts on this subject based on the ideXlab platform.

  • Geophone and mems accelerometer comparison at spring coulee alberta
    2009
    Co-Authors: Michael S Hons, Robert R Stewart
    Abstract:

    Summary Multicomponent seismic data, from a Geophone and accelerometer test at Spring Coulee, Alberta, are compared and inspected for frequency content and differences in signal-to-noise ratio (SNR). Amplitude spectra show general similarity between Geophones and accelerometers with differences in ambient noise appearing to be consistent with the theoretical modeling. Estimating the SNR at far offsets by comparing ambient noise to reflection energy suggests a small advantage for Geophones at low frequencies (<20 Hz), and a small advantage for MEMS accelerometers above 150 Hz. Further analysis of NMO-corrected receiver gathers shows there is greater frequency content in the MEMS accelerometer gathers at high frequencies, but the a phase coherency analysis shows that the bandwidth of coherent information is very similar.

  • comparison of mems accelerometers and Geophones at spring coulee alberta
    2008
    Co-Authors: Michael S Hons, Robert R Stewart
    Abstract:

    Geophone and MEMS accelerometer data from a field experiment at Spring Coulee, Alberta are compared in the acceleration domain. At receiver stations where coupling and noise are not a problem, measurements from both sensor types are found to be very similar. Several different analyses of signal-to-noise ratio indicate a small advantage for Geophones at low and medium frequencies, at later arrival times and longer offsets. Accelerometers appear to have a small advantage at higher frequencies, shorter arrival times and shorter offsets.

  • ground motion through Geophones and mems accelerometers sensor comparison in theory modeling and field data
    Seg Technical Program Expanded Abstracts, 2007
    Co-Authors: Michael S Hons, Don C. Lawton, Robert R Stewart, Malcolm B. Bertram
    Abstract:

    Summary Digital sensors based on micro electro mechanical systems (MEMS) accelerometers are one of the newest technologies being used in seismic acquisition. As such, some confusion remains surrounding similarities and differences relative to the coil-over-magnet Geophone. An understanding of the functioning of these sensors and how to compare them can be facilitated by deriving transfer functions, which relate the data acquired through each sensor to actual ground motion. An equation is then derived to calculate acceleration comparable to unprocessed MEMS data from unprocessed Geophone data. The inverse of this equation may be used to calculate Geophone data from MEMS data. The effects of sensors on zero and minimum phase wavelets are modeled, demonstrating that the raw output from the sensors should be similar. The minimum phase wavelets are convolved with a random reflectivity series to test deconvolution of impulsive source data. Deconvolution produces Geophone and MEMS processed traces that appear similar, and constant phase rotation of MEMS data after deconvolution cannot correct all remaining differences. The Geophone-to-MEMS transfer equation will exactly transfer between sensors only in the absence of instrument noise. Comparisons between MEMS and Geophones recording the same shots, and ground motion domains calculated from those records, show that the data is very similar in frequency content when the same domain is considered, and MEMS records will not necessarily have a larger magnitude contribution from low frequencies than