A model for the attenuation of peak ground acceleration in New Zealand earthquakes based on seismograph and accelerograph data

  • W. J. Cousins GNS Science, Lower Hutt, New Zealand
  • J. X. Zhao GNS Science, Lower Hutt, New Zealand
  • N. D. Perrin GNS Science, Lower Hutt, New Zealand

Abstract

A combination of weak-motion velocity data from seismographs and strong-motion acceleration data from accelerographs has been used to model the attenuation of peak ground acceleration (PGA) in New Zealand earthquakes. The resulting model extends the PGA attenuation model of Zhao, Dowrick and McVerry [30] to include the variability of rock strength, and also describes the unusually high attenuation in the volcanic zone of the North Island of New Zealand.

Strong-rock sites were found to experience lower PGAs than either weak rock or soil sites for magnitudes below Mw 7, and the apparent degree of amplification on going from strong rock to weak rock or soil decreased as the magnitude increased from Mw 5 to Mw 7. At magnitude 7 the PGAs were very similar for all site classes for source distances up to 100 km. When extrapolated to magnitudes beyond the maximum of the data, Mw 7.4, the model predicted that PGAs for strong rock sites were greater than for weak rock or soil sites.

The so-called "whole Taupo Volcanic Zone" was found to provide a good boundary for the zone of high attenuation in the volcanic region of the North Island. The high attenuation was successfully modelled as a simple function of the length of travel path through the zone of high attenuation. Over the effective maximum volcanic path length of about 70 km the extra attenuation resulted in a factor of ten reduction in PGA compared with non-volcanic paths of the same length.

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Published
1999-12-31
How to Cite
Cousins, W. J., Zhao, J. X., & Perrin, N. D. (1999). A model for the attenuation of peak ground acceleration in New Zealand earthquakes based on seismograph and accelerograph data. Bulletin of the New Zealand Society for Earthquake Engineering, 32(4), 193-220. https://doi.org/10.5459/bnzsee.32.4.193-220
Section
Articles

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