Subsurface signatures and timing of extreme wave events along the southeast Indian coast
Rajesh R Nair Madhav K Murari C S Vijaya Lakshmi Ilya Buynevich Ron J Goble P Srinivasan S G N Murthy Deshraj Trivedi Suresh Chandra Kandpal S M Hussain D Sengupta Ashok K Singhvi
Click here to view fulltext PDF
Permanent link:
https://www.ias.ac.in/article/fulltext/jess/120/05/0873-0883
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.
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
Volume 131, 2022
All articles
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode
© 2021-2022 Indian Academy of Sciences, Bengaluru.