Comparison Between Slip Distributions of the 2010 Mentawai Earthquake Derived by Two Inversion Modles Based on Tsunami Data
Abstract
It has been shown that the characteristics of a tsunami wave including wave heights recorded by DARTs in deep sea, waveforms recorded by tide gauges, and runup heights are useful to constrain some earthquake source parameters. In this study, we investigate the slip distribution of the 2010 Mentawai earthquake, a tsunami earthquake that occurred seaward of the southern Mentawai islands of Sumatra, and produced a locally devastating tsunami, with runup commonly in excess of 6 m. As a unique tsunami earthquake case, there is a significant discrepancy between the observed small GPS displacement and the very large tsunami runup (maximum value > 16 m), which cannot be explained by the conventional GPS or seismic inversion model. The goal of this work is to compare the slip distributions of this earthquake inferred from the available waveforms recorded by nearby tide gauges or from the tsunami height and runup data collected in a field survey, using two inversion models. One is based on Green's fuctions technique. The other is based on adjoint method which is an application of optimal control theory. The inversion by Green's functions requires a linear link between data and unknown variables. The adjoint method has the advantage of being able to use either linear or non-linear forward propagation models that can account for non-linear advection and run-up effects. The limitations of these two methods are discussed.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFMNH41A1699L
- Keywords:
-
- 4255 OCEANOGRAPHY: GENERAL Numerical modeling;
- 4304 NATURAL HAZARDS Oceanic;
- 4313 NATURAL HAZARDS Extreme events