TY - JOUR T1 - Stratigraphic evidence for an early Holocene earthquake in Aceh, Indonesia JF - Quaternary Science Reviews Y1 - 2012 A1 - Grand Pre, C. A1 - Horton, B. P. A1 - Kelsey, H. M. A1 - Rubin, C. M. A1 - Hawkes, A. D. A1 - Daryono, M. A1 - Rosenberg, G. A1 - Culver, S. J. AB - The Holocene stratigraphy of the coastal plain of the Aceh Province of Sumatra contains 6 m of sediment with three regionally consistent buried soils above pre-Quaternary bedrock or pre-Holocene unconsolidated sediment. Litho-, bio-, and chronostratigraphic analyses of the lower buried soil reveals a rapid change in relative sea-level caused by coseismic subsidence during an earlyHolocene megathrust earthquake. Evidence for paleoseismic subsidence is preserved as a buried mangrove soil, dominated by a pollen assemblage of Rhizophora and/or Bruguiera/Ceriops taxa. The soil is abruptly overlain by a thin tsunami sand. The sand contains mixed pollen and abraded foraminiferal assemblages of both offshore and onshore environments. The tsunami sand grades upward into mud that contains both well-preserved foraminifera of intertidal origin and individuals of the gastropod Cerithidea cingulata. Radiocarbon ages from the pre- and post-seismic sedimentary sequences constrain the paleoearthquake to 6500–7000 cal. yrs. BP. We use micro-and macrofossil data to determine the local paleoenvironment before and after the earthquake. We estimate coseismic subsidence to be 0.45 ± 0.30 m, which is comparable to the 0.6 m of subsidence observed during the 2004 Aceh–Andaman earthquake on Aceh’s west coast. VL - 54 N1 - id: 2139 JO - Stratigraphic evidence for an early Holocene earthquake in Aceh, Indonesia ER -