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Seismic refraction along a profile across the La Bajada fault

Seismic refraction along a profile across the La Bajada fault

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Seismic refraction along a profile across the La Bajada fault

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  1. Seismic refraction along a profile across the La Bajada fault Max Moorkamp

  2. Outline • Seismic refraction method • Area of study and objectives • Data • Models and interpretation • Conclusions

  3. Seismic refraction method • Uses refractions from interfaces to determine seismic velocities • At long distances the first arrival travels through deep layers • The Slope-Intersect-Method can be used to determine layer velocities and thickness • Results can be checked by calculating theoretical travel times from models

  4. Slope intersect method • Determine slope and intersect of first arrivals • Each slope and intersect corresponds to one layer • Information from 2 different sites can be used to obtain dip of layers

  5. Slope intersect method

  6. Suspected fault position Area of study and objectives • Obtain velocity structure in the sub-surface • Determine position of the La Bajada fault • Estimate fault offset from position of basalt layer

  7. Data for Site 457

  8. Slope-Intercept Models Sites 221 - 401 Sites 281 – 457 Sites 161 - 341 Sites 101 – 281

  9. Combined Models Sites 101 - 161 Sites 457 - 221 Basaltic rubble Loose Dirt Santa Fe Form. Quart. Sed. Basalt

  10. Conclusions • The La Bajada fault is probably located between seismic sites 161 and 221 • The top of the basalt is only present to the west at a depth of 80 m • The displacement on the fault is 200 m in 4My