Abstract
Summary 2-D modelling and imaging of line double-couple and spatially extended earthquake sources is demonstrated. Extrapolation of two-component (elastic) wavefields is implemented using finite differences. Running the extrapolatioin forward in time produces synthetic seismograms; running it backward in time produces an image of the source. Provided that the recording aperture is adequate, the source location, extent, orientation and radiation pattern may be recovered from the data. Synthetic examples include a normal fault at the edge of a rift, a reverse fault in a subduction zone and a line double couple in a cylindrical, whole-earth model.
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