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Tsunami forecast using an adaptive inverse algorithm for the Chile-Peru source region

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M.S.Q111.H3 4139 DEC 2006 r.pdf Version for non-UH users. Copying/Printing is not permitted 3.35 MB Adobe PDF View/Open
M.S.Q111.H3 4139 DEC 2006 uh.pdf Version for UH users 3.35 MB Adobe PDF View/Open

Item Summary

Title:Tsunami forecast using an adaptive inverse algorithm for the Chile-Peru source region
Authors:Sánchez, Alejandro, 1981
Keywords:Tsunamis -- Forecasting -- Mathematical models
Tsunamis -- South Pacific Ocean
Date Issued:2006
Abstract:The inverse method provides tsunami forecasts based on a regression analysis of near-field water-level data against a database of pre-computed tsunami waveforms corresponding unit slip of predefined sub faults. This thesis describes an improvement to this conventional inverse method by resolving the time sequence of tsunamigenic earthquake events. This adaptive approach provides additional degrees of freedom in the regression analysis to compensate for the errors in the user-specified earthquake time or the lag time in tsunami generation, and most importantly, to account for propagation of earthquake rupture. The algorithm also determines the initial subfaults for the regression analysis based on the arrival times of tsunami waves at water-level stations and those of the pre-computed waveforms. A hindcast analysis for the 1960 Valdivia-Chile, 1995 Antofagasta-Chile, and 2001 Atico-Peru tsunamis demonstrates the capability of the adaptive inverse method. The source parameters and subfault distribution for the Peru-Chile source region are based on seismotectonics and historical earthquakes. The present method produces better results in comparison to the conventional approach and indicates an apparent delay between the generation of the tsunamis and the reported earthquake times for all three events. The results suggest that the slip distribution and earthquake rupture propagation are very important for the near-field results while the bathymetry is the dominant factor which controls the shape of the waveforms in the far-field.
Description:Thesis (M.S.)--University of Hawaii at Manoa, 2006.
Includes bibliographical references (leaves 44-49).
vii, 50 leaves, bound ill. (some col.) 29 cm
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Ocean and Resources Engineering

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