Development of a method to estimate underground stress state using rock physics theory

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Prediction of pore pressure as well as effective stress is important to avoid drilling disaster, construct subsurface structure and monitor seismogenic faults. To predict pore pressure and effective stress, we estimate Poisson's ratio (or Vp/Vs ratio) from ocean bottom seismometer data using a newly-developed method. Poisson's ratio is strongly dependent on underground stress state. From the estimated seismic velocities, we predict effective stress and pore pressure using rock physics theory. Furthermore, we use S-wave characteristics in order to estimate principal stress direction and fracture alignment.