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ASSESSING TSUNAMI HAZARD ALONG THE NEW ZEALAND COAST

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Author(s): Roy A. Walters | James Goff

Journal: Science of Tsunami Hazards
ISSN 8755-6839

Volume: 21;
Issue: 3;
Start page: 137;
Date: 2003;
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Keywords: tsunamis | tsunami | New Zealand | long wave resonance | high-resolution model | storm surge | wave surge

ABSTRACT
An assessment is made for tsunami hazards along the New Zealand coast by searching for long-wave resonances for the range of periods spanned by tsunami and short-period storm surges. To accomplish this, a high-resolution model of the southwest Pacific is used to simulate the effects of these waves in an oceanic domain extending over 40° in latitude and 50° in longitude. This paper describes the results of such a simulation for waves with a period in the range of 15 to 300 minutes. The locations where wave resonances occur are compared with historical and geological evidence in order to evaluate the concurrence of the locations. A search of geological data was undertaken, and the results of palaeotsunami studies were compared with model predictions to determine the general utility of using resonance patterns to assess tsunami hazards.
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