Abstract
During the decade, the contemporaneous increase in data from moderately large earthquakes in New Zealand (and overseas) and the re-equipping of the New Zealand seismograph and accelerograph networks has seen good progress on several fronts. Earthquakes are now more accurately located and their spatial distribution is better defined. There have been improvements in the various databases used for seismic hazard assessments: active faults, earthquake catalogues, historical seismicity, and strong ground motions. The increase in strong-motion data has enabled the development of better models for Peak Ground Acceleration, and the effect of site conditions on site response, particularly for weak-to-moderate earthquake motions, has been studied in detail.
Highlights
The decade since Edgecumbe has seen the substantial reequipping of the networks of accelerographs and seismographs in New Zealand with digitally recording instruments
For the seismograph network this has been a complete refurnishing: all recording is digital, some sub-networks use bandlimited analogue telemetry that limits the dynamic range of their digital recordings (e.g. [15])
The new seismograph network, with stations located at sites subject to less natural and cultural noise than the old network has lead to more accurate locations which has brought the pattern of regularly occurring small earthquakes into sharper focus [2]
Summary
The decade since Edgecumbe has seen the substantial reequipping of the networks of accelerographs and seismographs in New Zealand with digitally recording instruments. In New Zealand, digital seismograms are direct outputs from velocity transducers These may be numerically differentiated to give acceleration records, supplementing the database of accelerograms for attenuation studies. Few of these expensive instruments have been deployed in New Zealand to date, but development plans for the seismograph network envisage their acquisition, leading to improvements in both earthquake studies and attenuation models
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