Summary
Fault plane solutions of earthquakes which are based onP observations only have the drawback that they yield two orthogonal planes either of which could be the fault plane. In this paper it is investigated what minimal information fromS waves is required to resolve the ambiguity as to which of the two orthogonal planes is the fault plane. It is shown that, in principle, only the sign of the initial impulse of theSH phase at one favorably located station is necesary for this purpose. It is emphasized, however, that the station must be favorably located, i.e. it must be located in certain sectors of the globe. The conditions for the latter are stated.
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References
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Scheidegger, A.E. On fault plane solutions of earthquakes. Geofisica Pura e Applicata 39, 13–25 (1958). https://doi.org/10.1007/BF02001128
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DOI: https://doi.org/10.1007/BF02001128