On 26 December 2004, one of the largest recorded earthquakes occurred, triggering a devastating tsunami that killed an estimated 300,000 people. The event was initially classified as Mw 9.0 based on the analysis of seismic body and surface waves (Nettles and Ekstrom, 2004; Ji, 2005; Park et al., 2005). Classical methods of magnitude calculation are hampered by the long duration of the event, however, since late-arriving phases from the earliest portion of the rupture may obscure first-arriving energy sourced from other portions of the rupture. This same phenomenon also limits our ability to constrain...

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