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Aeromagnetic Anomalies in Sedimentary Basins: Lessons from Rio Grande Rift

Learn about advancements in modeling aeromagnetic anomalies related to faults in sedimentary basins, with insights from the Rio Grande Rift in New Mexico. Explore how traditional magnetic fault models are being challenged, the impact of near-surface layers on signals, and the importance of high-resolution airborne surveys for accurate results.

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Aeromagnetic Anomalies in Sedimentary Basins: Lessons from Rio Grande Rift

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  1. Advances in Modeling Aeromagnetic Anomalies Related to Faults in Sedimentary Basins— Lessons Learned from the Rio Grande Rift, New Mexico V.J.S. (“Tien”) Grauch Mark R. Hudson U.S. Geological Survey Denver, Colorado, USA

  2. Traditional Magnetic Fault Models

  3. Ground Traverse Magnetic Surveys in Sedimentary Basins Regional Airborne Survey magneticbasement 750 • Near-surface layers swamp the signal • Model as contact/step 1000 • Magnetic basement swamps the signal • - Model as steps or offset layers

  4. Advances in Airborne Surveys High-resolution Airborne Survey • MULTIPLE layers are resolved • Traditional models may not be appropriate 750 1000

  5. Central Rio Grande Rift Rift sediments Syn-rift volcanics Pre-rift, mainly sedimentary rocks Precambrian basement

  6. Rio Rancho Area Aeromagnetic Surveys for the Central Rio Grande Rift Flown 1996-1998 • Specifications • Fixed-wing aircraft • E-W lines 100-150 m apart • Terrain clearance 100-150 m

  7. View to the South Rio Rancho Aeromagnetic Data

  8. Rio Rancho Aeromagnetic Data

  9. Variety of Observed Magnetic Profiles

  10. The Concept of Magnetic-Contrast Layers E W

  11. The Concept of Magnetic-Contrast Layers E W MAGNETIC CONTRAST

  12. The Concept of Magnetic-Contrast Layers E W E W

  13. Advances in Airborne Surveys High-resolution Airborne Survey • MULTIPLE layers are resolved • Traditional models may not be appropriate • Use equivalent magnetic-contrast layers • Applicable to any layered environment

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