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    Accommodation space, relative sea level, and the archiving of paleo-earthquakes along subduction zones


    Kelsey, Harvey M and Engelhart, Simon E. and Pilarczyk, Jessica E. and Horton, Benjamin P. and Rubin, Charles M. and Daryono, Mudrik R and Ismail, Nazli and Hawkes, Andrea D. and Bernhardt, Christopher E. and Cahill, Niamh (2015) Accommodation space, relative sea level, and the archiving of paleo-earthquakes along subduction zones. Journal of Geology, 43 (8). pp. 675-678. ISSN 1537-5269

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    Abstract

    The spatial variability of Holocene relative sea-level (RSL) change influences the capacities of coastal environments to accommodate a sedimentary record of paleoenvironmental change. In this study we couch a specific investigation in more general terms in order to demonstrate the applicability of the relative sea-level history approach to paleoseismic investigations. Using subsidence stratigraphy, we trace the different modes of coastal sedimentation over the course of time in the eastern Indian Ocean where RSL change evolved from rapidly rising to static from 8000 yr ago to present. Initially, the coastal sites from the Aceh, Sumatra, coastal plain, which are subject to repeated great earthquakes and tsunamis, built up a sedimentary sequence in response to a RSL rise of 1.4 mm/yr. The sequence found at 2 sites 8 km apart contained 3 soils of a mangrove origin (Rhizophora, Bruguiera/Ceriops, Avicennia pollen, and/or intertidal foraminifera) buried by sudden submergence related to coseismic subsidence and 6 tsunami sands that contain pristine subtidal and planktic foraminifera. After 3800 cal yr B.P. (years before A.D. 1950), sea level stabilized and remained such to the present. The stable relative sea level reduced accommodation space in the late Holocene, suggesting that the contaggradation of the coastal plain was a consequence of periodic coastal inundation by tsunamis

    Item Type: Article
    Keywords: Accommodation space; relative sea level; archiving; paleo-earthquakes; subduction zones;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Item ID: 14570
    Identification Number: https://doi.org/10.1130/G36706.1
    Depositing User: Niamh Cahill
    Date Deposited: 29 Jun 2021 15:57
    Journal or Publication Title: Journal of Geology
    Publisher: The University of Chicago Press
    Refereed: Yes
    URI:

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