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SEA LEVEL SIGNALS CORRECTION FOR THE 2011 TOHOKU TSUNAMI

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Author(s): A. Annunziato

Journal: Science of Tsunami Hazards
ISSN 8755-6839

Volume: 31;
Issue: 2;
Start page: 99;
Date: 2012;
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Keywords: Tsunami | Sea Level Measurements | GPS | Tsunami Source | Earth Deformatio

ABSTRACT
The paper analyses the signals measured during the M9.0 Tohoku Tsunami in order to identify the effect of the subsidence on the measurements and to determine correction factors to be applied to the measurements. The objective is to have a coherent set of measurements that can allow the correct estimation of the source term for this event through inversion techniques. In fact the inversion techniques tend to minimize the difference between the measured signals and the calculated value; which means that in the initial period and also for the peak, the solution found without considering this correction tends to get higher values of the source (the peak in some cases is almost 1.4 m higher on a maximum of 4-5 m, thus is not negligible).The amount of the correction has been determined using the long-term displacement shown in the measurements; the subsidence estimates are also compared with the values obtained using GPS instruments. The analysis shows that the subsidence has a notable influence on the measurements where the deformation is large and that taking into account the deformation in the signals may improve the quality of the estimation of the initial deformation.
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