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Magnitude reassessment of New Zealand earthquakes



Magnitude reassessment of New Zealand earthquakes



Earthquake Engineering and Structural Dynamics 20(6): 577-596



The surface-wave magnitudes of a selection of New Zealand earthquakes have been determined on a consistent basis using the "Prague formula" and station corrections. The earthquakes range in magnitude from about 5 to 7.8, covering the instrumental period 1901-1988. Magnitudes for many of the earlier events had not been properly determined previously; and some significant discrepancies from the traditional magnitudes were found. The use of European station data (160 degrees D-175 degrees ) is important to New Zealand because of its geographical isolation. These distant data were found to give consistently slightly higher M (sub S) than closer stations, but could be used without bias through the station correction procedure. The relationship between M (sub S) and M (sub L) was found for 31 "shallow" New Zealand events and much of the scatter was explained as a function of depth. Significant differences in M (sub S) /M (sub L) expressions from Europe and California were also found. The limited New Zealand data for M (sub W) and M (sub O) related well to Californian and global relationships with M (sub S) .

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Accession: 019361557

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DOI: 10.1002/eqe.4290200606


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