Abstract
It has long been known that variations in soil type can produce differences of several steps of intensity on the Modified Mercalli scale in different parts of an area experiencing the same basic earthquake vibration. Some magnification of the amplitude of earthquake vibration is caused by the lower acoustic impedance of poor soil, and further effects can arise from resonances in layers of differing composition.
Highlights
It has long been known that variations in soil type can produce differences of several steps of intensity on the Modified Mercalli scale in different parts of an area experiencing the same basic earthquake vibration
Some magnification of the amplitude of earthquake vibration is caused by the lower acoustic impedance of poor soil, and further effects can arise from resonances in layers of differing composition
The mapping of various areas of New Zealand from this point of view, or "microzoning", has long been advocated, and since April 1968 four divisions of DSIR have been collaborating in working out techniques to enable useful microzoning maps to be prepared
Summary
It has long been known that variations in soil type can produce differences of several steps of intensity on the Modified Mercalli scale in different parts of an area experiencing the same basic earthquake vibration. The mapping of various areas of New Zealand from this point of view, or "microzoning", has long been advocated, and since April 1968 four divisions of DSIR have been collaborating in working out techniques to enable useful microzoning maps to be prepared.
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