Abstract Monitoring time‐lapse changes in subsurface physical properties of the near‐surface critical zone is increasingly important with respect to climate change, environmental conservation/remediation, geohazard mitigation, and geotechnical engineering activities. Innovative controlled‐source cross‐well seismic monitoring surveys combined full waveform inversion analysis enable us map small ...

Shear-wave velocity is an indication of the shear strength of the ground since the velocity is related to the shear modulus. Therefore, monitoring the velocities is useful for site characterization and disaster prevention. We estimate the time-lapse change in shear-wave velocity as well as shear-wave splitting in the shallow subsurface throughout Japan by applying seismic interferometry to the ...

An important part of any CO2 geosequestration project is to ensure containment and conformance in the subsurface. This generally done by implementing a comprehensive, risk-based Measurement, Monitoring Verification plan, key element which active time-lapse seismic monitoring. However, high cost environmental impact standard surface monitoring dictate need for cost-effective environmentally frie...

This thesis describes the design and implementation of a parallel algorithm for data assimilation with ensemble Kalman filter (EnKF) for oil reservoir management. The implemented application works on large number of observations from time-lapse seismic, which lead to a large turnaround time for the analysis step, in addition to the time consuming simulations of the realizations. Provided that p...