The 2004 Sumatra earthquake (Magnitude 9.3!) is the longest earthquake ever recorded on Earth. The rupture lasted for 10 minutes and propagated unilaterally from offshore Sumatra (red star below) up to the Andaman islands 1600 km away. The tsunami associated with this earthquake caused damage and casualties in almost all the countries surrounding the Indian Ocean. We imaged the slip distribution of the this exceptional rupture along the Indonesian subduction fault using geodetic and tsunami data and an innovative Bayesian approach allowing us to estimate ellipses of uncertainties on the model (Bletery et al., JGR, 2016):