Abstract
The attenuation of peak ground accelerations was studied for eight New Zealand earthquakes which occurred in the period 1987 to 1991. These events were of medium size with moment magnitudes in the range Mw = 5.8 - 6.7, with depth to centroids of the fault rupture ranging from 4 to 60 km. Attenuation of peak ground accelerations was examined for each event, based on the slope distance from the rupture surface to each strong motion data site. The mean regression attenuation curve for each event was compared with those derived by others using data sets from other parts of the world, allowance being made for source mechanism and depth. Excepting the 1988 Te Anau event, the other seven New Zealand events as a set closely match a Japanese model, but give significantly stronger accelerations than those predicted by the models from western USA and Europe.
Highlights
Because of a shortage of suitable local ground motion records, no reliable model has yet been developed for the attenuation of peak ground acceleration (PGA) in New Zealand
An examination of PGAs was made [l] in 1980, while parallel relationships which have been published are (1) an attenuation model [2] for spectral accelerations developed for loadings code purposes based on a Japanese model, and (2) a recent attempt to do the same from New Zealand data [3]
Eight recent New Zealand earthquakes of moderate magnitude in four widely separated parts of the country (Figure 1) yielded sets of strong motion records which give us the opportunity to make a preliminary comparison of attenuation of PGA in New Zealand with the predictions of overseas models, and gain some insights into the true nature of our local attenuation laws
Summary
Because of a shortage of suitable local ground motion records, no reliable (statistically robust) model has yet been developed for the attenuation of peak ground acceleration (PGA) in New Zealand. Eight recent New Zealand earthquakes of moderate magnitude in four widely separated parts of the country (Figure 1) yielded sets of strong motion records which give us the opportunity to make a preliminary comparison of attenuation of PGA in New Zealand with the predictions of overseas models, and gain some insights into the true nature of our local attenuation laws. In this interim study the influence of soil condition has not been examined, as a larger data set would be needed to do it justice. BULLETIN OF THE NEW ZEALAND NATIONAL SOCIETY FOR EARTHQUAKE ENGINEERING, Vol 26, No., March 1993
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