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Magnitudes of New Zealand earthquakes; a comparison of magnitudes calculated by different methods



Magnitudes of New Zealand earthquakes; a comparison of magnitudes calculated by different methods



Tectonophysics 93(3-4): 245-248



Before the introduction in 1977 of new procedures for calculating the local magnitudes of New Zealand earthquakes, these were calculated using a derivative of Richter's method for southern California. There are systematic differences between the magnitudes calculated by the two methods which are functions of position, magnitude and the type of seismometer recording the event. Usually the difference is small, though, for large earthquakes in particular, it can be close to unity. Differences of order unity are often observed between bodywave magnitude values reported by the ISC and both sets of local magnitudes, which now allow for the nature of wave propagation below New Zealand, and those reported by the ISC.

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Accession: 019361673

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DOI: 10.1016/0040-1951(83)90281-0


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