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    Macrobenthic assemblages of anthropogenically active subtidal zones contiguous to a marine protected area: a 9-year revisit

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    Date
    2025
    Author
    Sukumaran, S.
    Jisna, J.
    Ridha, H.
    Pradhan, U. K.
    Pawar, S.
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    Abstract
    Submarine mass wasting in continental margins poses a significant threat to offshore installations, submarine communication cables, and coastal communities due to tsunamis. Based on the analysis of time-lapse geophysical data, we report a very recent submarine slope failure and associated mass transport deposit (MTD) in the Krishna-Godavari (KG) basin, the Bay of Bengal that occurred between January 2009 and December 2015. The head scarp shows erosion of?~?160 m thick sedimentary strata with an estimated volume of?~?11 km3. The fan-shaped MTD, located at water depths of 950 to 1100 m, shows a spatial coverage of?~?70 km2 (volume is?~?2.2 km3) with a maximum thickness of?~?60 m. This is one of the largest submarine slope failures reported from time-lapsed geophysical surveys. We analyzed potential triggers such as floods, earthquakes, and cyclones that could have caused the slope failure. We believe that Cyclone Helen, a category-1 storm, may have contributed to the observed slumping in unstable shelf/slope regions of the KG Basin in November 2013 as the Cyclone eye traversed over the head of the slump. However, we cannot rule out other factors such as the extreme flooding events (2010 and 2013) and a 6.0 magnitude earthquake in the Bay of Bengal in May 2014. The study shows that pre-conditioning of sediments is an important factor in the assessment of deepwater geohazards, and areas with relatively moderate external triggers are also at high risk.
    URI
    https://doi.org/10.1007/s11356-024-35763-9
    http://drs.nio.res.in/drs/handle/2264/9394
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