The deadliest tsunami ever recorded (modern times) struck off Sumatra on the day after Christmas, 2004 (remember that stuff about Winter Solstice & 2 weeks later, the Perihelion, with the combined Tidal Pumping stresses driving the ENSO).

Well, seismic energy release on the eastern coast of the Indian Ocean effectively ended a La Niña.

Note the somewhat extended La Niña from mid-2003 to mid-2005. Stress accumulation finally let loose. Approx. a half year to see the impact on sea surface temperatures.