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Bulletin of the Seismological Society of America; February 1981; v. 71; no. 1; p. 275-294
© 1981 Seismological Society of America
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A local magnitude scale for New Zealand earthquakes

A. J. HAINES

SEISMOLOGICAL OBSERVATORY GEOPHYSICS DIVISION, D.S.I.R., P.O. BOX 1320, WELLINGTON, New Zealand

Abstract

New procedures have been used since 1977 for assigning local earthquake magnitudes in New Zealand, based on a slightly modified form of Richter's definition and derived from amplitude-distance relations determined from New Zealand earthquakes. The magnitudes for all crustal earthquakes, and for subcrustal earthquakes in or north of the Main Seismic Region, are determined using a formula for geometric spreading which is appropriate to head-wave propagation; for subcrustal earthquakes south of the Main Seismic Region, they are determined assuming body-wave propagation. Inelastic attenuation needs to be taken into account for subcrustal earthquakes south of the Main Seismic Region, and when paths from crustal earthquakes pass through a region which includes the zone of recent volcanism in the center of the North Island.




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