MULTICOMPONENT PASSIVE SEISMIC IMAGING USING GEOMETRICAL OPTICS

摘要

A method for passive seismic imaging includes entering into a programmable computer seismic signals measured at a plurality of spaced apart locations above a volume of Earth's subsurface to be evaluated. The signals are measured at each location along different directions to enable resolution of motion in three orthogonal directions. A seismic moment tensor is determined for at least one seismic event occurring in the subsurface from the measured seismic signals. Divergence-free transverse) and curl-free longitudinal components of a source term are determined from the moment tensor, seismic velocities, and the measured seismic signals. An image is generated at at least one point in the subsurface using the determined components.

主权项

1. A method for passive seismic imaging, comprising:
entering into a programmable computer seismic signals measured at a plurality of spaced apart locations proximate a volume of Earth's subsurface to be evaluated, the seismic signals measured at each location along different directions to enable resolution of motion in three orthogonal directions; in the computer, determining a seismic moment tensor for at least one seismic event occurring in the subsurface from the measured seismic signals; in the computer, determining divergence-free transverse and curl-free longitudinal components of a source term derived from the seismic moment tensor of the at least one seismic event; and in the computer, generating an image at at least one point in the subsurface using the determined divergence-free transverse and curl-free longitudinal components.