Report of Investigations 9497: MIGRATOM - Geophysical Tomography using Wavefront Migration and Fuzzy Constraints

Details

• Journal Article:
  Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9497
• Personal Author:
  Jackson, Michael J. ; Tweeton, Daryl R.
• Description:
  MIGRATOM is a third-generation PC-based computer program for geophysical tomograph. It was developed to enable users to address a variety of mining-related problems by mathematically reconstructing the distribution of physical properties in a rock mass, using measurements of travel time or amplitude of wave energy propagated through the rock mass. Examples of applications include litho-logic characterization, fracture detection, fluid monitoring, stress evaluation, and blast assessment. The resolution and accuracy of tomographic reconstructions generally depend very strongly on the geometry of source and receiver locations. In many practical applications, such as cross-borehole tomography, limited coverage results in nonunique reconstructions. MIGRATOM allows the user to constrain the inversion, in order to reduce the nonuniqueness problem. A new approach to application of constraints implemented in MIGRATOM is based on fuzzy logic techniques. Refraction of wave energy is modeled in MIGRATOM using an approach based on Huygens' Principle. Propagation of a continuous wavefront is modeled as a constructive interference phenomenon, which obviates the shadow-zone problem that affects conventional ray-tracing calculations. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Keywords:
  Imagery; Fuzzy-logic; Mining; Wave-propagation; Rocks; Rock-mechanics; Ray-tracing; Computer-programs; Tests; Geophysical-prospecting; Computer-aided-tomography
• Source:
  Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9497, 1994 Jan; :1-25
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  Minnesota ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  41 pdf pages
• NIOSHTIC Number:
  nn:10005134
• NTIS Accession Number:
  PB94-174448
• Federal Fiscal Year:
  1994
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7d4bac108a7861c96c9988e2dccf665ffd72cab65cb69ef91f557337a9b774d5f15c29590431f79037770a1a85333c397635d78b76aab965b43b51fb16569122
• Download URL:
  https://stacks.cdc.gov/view/cdc/10193/cdc_10193_DS1.pdf
• File Type:
  [PDF - 4.47 MB ]