Title: Sedimentary InvesƟ gaƟ ons Off shore Sumatra: Riddling the Seafl oor for Evidence of Earthquakes and Submarine Landslides.

approved:_____________________________________________________________ Chris Goldfi nger Abstract text: SubducƟ on zone earthquake and tsunami hazards aff ect tens of millions worldwide and the recurrence of these disasters can be evaluated with paleoseismic techniques, because earthquake cycles (and their supercycles) typically span many millennia. In these three chapters, I discuss a suite of analyses I use to evaluate the sedimentary record of earthquakes as sampled in cores collected by the authors on the R/V Roger Revelle in 2007 off shore Sumatra, cruise RR0705, aka KNOX05RR. In the fi rst chapter I discuss the mid- to late-Holocene recurrence of earthquakes in the region of the 2004 Sumatra-Andaman subducƟ on zone earthquake. I esƟ mate that the early Holocene to historic recurrence of turbidity current triggering earthquakes in the region of the 2004 Sumatra-Andaman subducƟ on zone earthquake to be 260 ± 160 calendar years. I idenƟ fy the uppermost turbidite in fi Ō een cores to have been deposited as a result of strong ground shaking from this 2004 earthquake. In the second chapter