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Reflection Survey

Reflection Survey. Todd Hansen Diana Hooper Michelle Heimgartner. Seismic reflection. Methods. Bison Galileo 21 2-24 channel cables spaced 2 m apart Seismic source: 10-lb sledgehammer, 10 hits every 4 meters Six 100 Hz geophones per group Geophone groups overlapped to diminish noise

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Reflection Survey

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  1. Reflection Survey Todd Hansen Diana Hooper Michelle Heimgartner

  2. Seismic reflection

  3. Methods • Bison Galileo 21 • 2-24 channel cables spaced 2 m apart • Seismic source: 10-lb sledgehammer, 10 hits every 4 meters • Six 100 Hz geophones per group • Geophone groups overlapped to diminish noise • Records were 0.5 s

  4. Sources of potential error • Noise: • Wind - rattles geophones (windy on both days) • Soft sediment - attenuation of seismic waves • Bad geophone plants • Not error - loss of precision by overlapping the geophone groups

  5. Processing Methods • Viewmat500 • Bandpass filter of 75-150 Hz with a 20% taper • Trace-edit to erase noisy traces (multiply the amplitude of the trace by zero) • Common Velocity Stack • Common Midpoint Stack

  6. Hazen reflection profile

  7. Hazen cvstack profile

  8. Hazen cmpstack profile

  9. Fernley reflection profile

  10. Fernley cvstack profile

  11. Fernley cvstack profile

  12. Fernley cmpstack profile

  13. Thrust fault interpretation

  14. Drape Fold Interpretation

  15. Conclusions • Fault???

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