Abstract

Source parameters, namely full moment tensor and source location, are investigated based on a full waveform adjoint inversion. The method relies on full wave simulations and takes advantage of the misfit between observed and synthetic seismograms. An adjoint wavefield is calculated by back-propagating the difference between observed and synthetics from the receivers to the source. The interaction between this adjoint wavefield and the regular forward wavefield helps define source parameter Fréchet derivatives, that is, the sensitivity of the misfit with respect to the source parameters. We demonstrate the method on two synthetic cases before tackling a recent event recorded at the Geysers geothermal field.

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