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      https://www.ias.ac.in/article/fulltext/jess/120/05/0873-0883

    • Keywords

       

      Extreme events; ground-penetrating radar; heavy minerals; magnetic susceptibility; optical luminescence dating.

    • Abstract

       

      Written history’s limitation becomes apparent when attempting to document the predecessors of extreme coastal events in the Indian Ocean, from 550–700 years in Thailand and 1000 years in Indonesia. Detailed ground-penetrating radar (GPR) surveys in Mahabalipuram, southeast India, complemented with sedimentological analyses, magnetic susceptibility measurements, and optical dating provide strong evidence of extreme wave events during the past 3700 years. The diagnostic event signatures include the extent and elevation of the deposits, as well as morphologic similarity of buried erosional scarps to those reported in northern Sumatra region. Optical ages immediately overlying the imaged discontinuities that coincides with high concentration of heavy minerals date the erosional events to 340 ± 35, 350 ± 20, 490 ± 30, 880 ± 40, 1080 ± 60, 1175 ± 188, 2193 ± 266, 2235 ± 881, 2489 ± 293, 2450 ± 130, 2585 ± 609, 3710 ± 200 years ago. These evidences are crucial in reconstructing paleo extreme wave events and will pave the way for regional correlation of erosional horizons along the northern margin of Indian Ocean.

    • Author Affiliations

       

      Rajesh R Nair1 Madhav K Murari2 C S Vijaya Lakshmi3 Ilya Buynevich4 Ron J Goble5 P Srinivasan6 S G N Murthy6 Deshraj Trivedi3 Suresh Chandra Kandpal3 S M Hussain7 D Sengupta3 Ashok K Singhvi2

      1. Department of Ocean Engineering, Indian Institute of Technology, Madras, India.
      2. Physical Research Laboratory, Ahmedabad 380 009, India.
      3. Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India.
      4. Department of Earth and Environmental Science, Temple University, 1901 N., 13th Street, Philadelphia, PA 19122, USA.
      5. Department of Geosciences, University of Nebraska, Lincoln, Nebraska 68588, USA.
      6. Structural Engineering Research Centre, Chennai, India.
      7. Madras University, Chennai, India.
    • Dates

       
  • Journal of Earth System Science | News

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