Stratigraphic record of Holocene coseismic subsidence, Padang, West Sumatra
Rubin, Charles M.
Kelsey, Harvey M.
Horton, Benjamin P.
Hawkes, Andrea D.
Vane, Christopher H.
Grand Pre, Candace
MetadataShow full item record
Stratigraphic evidence is found for two coseismic subsidence events that underlie a floodplain 20 km south of Padang, West Sumatra along the Mentawai segment (0.5°S–0.3°S) of the Sunda subduction zone. Each earthquake is marked by a sharp soil-mud contact that represents a sudden change from mangrove to tidal flat. The earthquakes occurred about 4000 and 3000 cal years B.P. based on radiocarbon ages of detrital plant fragments and seeds. The absence of younger paleoseismic evidence suggests that late Holocene relative sea level fall left the floodplain too high for an earthquake to lower it into the intertidal zone. Our results point to a brief, few thousand year window of preservation of subsidence events in tidal-wetland stratigraphic sequences, a result that is generally applicable to other emergent coastlines of West Sumatra.
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 116 (2011): B11306, doi:10.1029/2011JB008205.
Showing items related by title, author, creator and subject.
Meckel, T. A.; ten Brink, Uri S.; Williams, S. Jeffress (American Geophysical Union, 2006-06-14)Relative contributions of geologic and anthropogenic processes to subsidence of southern Louisiana are vigorously debated. Of these, shallow sediment compaction is often considered dominant, although this has never been ...
Heterogeneous rupture in the great Cascadia earthquake of 1700 inferred from coastal subsidence estimates Wang, Pei-Ling; Engelhart, Simon E.; Wang, Kelin; Hawkes, Andrea D.; Horton, Benjamin P.; Nelson, Alan R.; Witter, Robert C. (John Wiley & Sons, 2013-05-15)Past earthquake rupture models used to explain paleoseismic estimates of coastal subsidence during the great A.D. 1700 Cascadia earthquake have assumed a uniform slip distribution along the megathrust. Here we infer ...
Nelson, James A.; Stallings, Christopher D.; Landing, William M.; Chanton, Jeffrey P. (2013-03-17)We evaluated the potential contribution of allochthonous biomass subsidies to the upper trophic levels of offshore food webs in the northeastern Gulf of Mexico (GOM). We made this evaluation considering nitrogen, an essential ...