A variant of the Cagniard-Pekeris inversion technique is extended to nonsymmetric earthquake sources of arbitrary multipolar order with a particular emphasis on shear dislocations. In the present work, we concentrate on the infrastructure of the time-domain displacement field in the presence of a single interface. A series of transformations in the complex plane together with a novel decomposition of the total field into three fundamental constituents enables us to separate the real-time contributions due to head waves, geometrical waves and the so-called non-least-time arrivals.

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