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In the first days after a magnitude 8.7 earthquake leveled buildings on the Sumatran islands of Nias and Simeulue on 28 March, experts wondered why it failed to generate a significant tsunami. After all, the monster quake that struck just to the north in December spawned a tsunami that killed more than a quarter-million people. Now that they've had a chance to locate the fault rupture more precisely and to run some simulations, they believe that the islands that bore the brunt of the March quake largely stifled its tsunami.
Richard A. Kerr (2005) studied this question.