Reflection survey
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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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Presentation Transcript
Reflection survey

Reflection Survey

Todd Hansen

Diana Hooper

Michelle Heimgartner



Methods
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


Sources of potential error
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


Processing methods
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











Conclusions
Conclusions

  • Fault???