Abstract
The Ms 7.4 1968 Inangahua earthquake was the largest New Zealand earthquake to have occurred from 1934 to 1992. The valuable strong motion data obtained on scratchplate acceleroscopes has not previously been adequately described. Filling that information gap, this paper lists the re-evaluated peak ground accelerations and examines their attenuation properties. It is shown that the accelerations from this event are much stronger over a wide range of source distances than those obtained using attenuation models for the western USA. Similar results have been found for a number of more recent New Zealand events in another study.
Highlights
SUMMARYThe M, 7.4 1968 Inangahua earthquake was the largest New Zealand earthquake to have occurred from 1934 to 1992
The main shock of the Inangahua earthquake of 23(UT) May 1968 occurred in the Southern Alps of New Zealand, epicentre 41.8°S 172.0°E
This large earthquake occurred in the early days of strong motion recording in New Zealand, and perhaps because of this the strong ground motion records obtained have not previously been fully written up
Summary
The M, 7.4 1968 Inangahua earthquake was the largest New Zealand earthquake to have occurred from 1934 to 1992. The valuable strong motion data obtained on scratchplate acceleroscopes has not previously been adequately described. This paper lists the re-evaluated peak ground accelerations and examines their attenuation properties. It is shown that the accelerations from this event are much stronger over a wide range of source distances than those obtained using attenuation models for the western USA. Similar results have been found for a number of more recent New Zealand events in another study
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