Morphometric analysis of the Andaman outer shelf and upper slope—Implications for the recent slope failure events

Pachoenchoke Jintasaeranee Anond Snidvongs

Pachoenchoke Jintasaeranee, Anond Snidvongs. Morphometric analysis of the Andaman outer shelf and upper slope—Implications for the recent slope failure events[J]. Acta Oceanologica Sinica, 2023, 42(9): 44-52. doi: 10.1007/s13131-023-2154-1
Citation: Pachoenchoke Jintasaeranee, Anond Snidvongs. Morphometric analysis of the Andaman outer shelf and upper slope—Implications for the recent slope failure events[J]. Acta Oceanologica Sinica, 2023, 42(9): 44-52. doi: 10.1007/s13131-023-2154-1

doi: 10.1007/s13131-023-2154-1

Morphometric analysis of the Andaman outer shelf and upper slope—Implications for the recent slope failure events

Funds: The Financial Support Jointly by the National Research Council of Thailand and the German Research Foundation.
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  • Figure  1.  Synthetic maps showing location of the Andaman Sea in the Northeast Indian Ocean. Patterns of seasonal sea-surface circulation including the westerly currents (NE monsoon) and the south-easterly currents (SW monsoon) are summarily redrawn from Rodolfo (1969) (a). The tectonic setting of the Andaman Basin redrawn from Curry (2005). Sediment textures covering the basin are redrawn from Rodolfo (1969). The blue box shows the investigated area (b). EEC: exclusive economic zone.

    Figure  2.  A new detailed bathymetry of the upper slope of the Andaman Sea outer shelf is overlain on GEBCO 30-arc second GDA (The GEBCO_08 Grid, 2010) (a) and complements them with ship track-lines (b) and location of the study area (c). The investigated area is shown by a blue box. Detailed information in submarine landslides are shown in Figs 4a and b, plateaus are shown in Figs 5a and b, and gullies are shown in Fig. 6a.

    Figure  3.  Interpretation of the bathymetry shows prominent features, including three large plateaus surrounded by moats (a) . Drawn lines of slope ruggedness are shown by black lines. Contour interval is 40 m. Latitudinal (NS1-1 to NS3-3) (b) and longitudinal profiles (c)(WE1 to WE8) show the general morphological trends of the Andaman Sea outer shelf and upper slope.

    Figure  4.  Color-coded shaded relief maps with interpretation showing possible submarine landslides on the northernmost (i) and the middle part (ii) of the Andaman outer shelf and upper slope. Black dotted-lines show approximated slide scars, while red dotted-lines show approximated slide toes. Profile aa′ and a subbottom profiler record along Profile cc′ show a slide scar and convex-upward slopes that could represent displaced mass and slide deposits. Echo-character along Profile bb′ presents possible sediment deposit. For locations of both slides refer to Fig. 2.

    Figure  5.  Morphology of the northern plateau (i) and the southern plateau (ii) are shown by bathymetry, backscattering imagery and their high frequency subbottom profiles. The boundaries of possible sediment failure deposits are marked by red dotted lines. Locations of plateaus refer to Fig. 2.

    Figure  6.  A color-codes shaded 3D map showing gullies or possible head of canyons (i) and cross section along Profile aa′, bb′, and cc′ (ii). Locations of gullies refer to Fig. 2.

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  • 收稿日期:  2021-12-05
  • 录用日期:  2022-10-28
  • 网络出版日期:  2023-10-18
  • 刊出日期:  2023-09-01