We review seismicity along the Nicobar-Andaman plate boundary prior to the Mw 9 earthquake of 26 December 2004, with particular attention to reverse slip in the central and northern parts of the rupture zone 600-1,300 km north from the epicenter. Slip is partitioned between convergence and strike-slip motion, which in the northern Andamans is assisted by back-arc spreading. Subduction-zone earthquakes prior to the rupture occurred largely to the east and at greater depths than the area ruptured in the shallow 2004 megathrust. Large thrust earthquakes in 1847 (Mw > 7.5), 1881 (Mw 7.9), and 1941...
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