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Title: | Nearshore tsunami amplitudes across the Maldives archipelago due to worst case seismic scenarios in the Indian ocean |
Other Titles: | Patrica A. Potter ... {et al.} |
Authors: | Rasheed, Shuaib Warder, Simon C. Plancherel, Yves Piggott, Matthew D. |
Issue Date: | 2022 |
Publisher: | Natural Hazards and Earth System Sciences |
Citation: | Rasheed, S. ...{et al.}. (2022). Nearshore tsunami amplitudes across the Maldives archipelago due to worst case seismic scenarios in the Indian ocean. Natural Hazards and Earth System Sciences. 1-27. |
Abstract: | The Maldives face the threat of tsunamis from a multitude of sources. However, the limited availability of critical data, such
as bathymetry (a recurrent problem for many island nations), has meant that the impact of these threats has not been studied at
an island scale. Studies of tsunami propagation at the island scale but across multiple Atolls is also a challenging task due to
the large domain and high resolution required for modelling. Here we use a high resolution bathymetry dataset of the Maldives
archipelago, and corresponding high numerical model resolution, to carry out a scenario-based tsunami hazard assessment for
the entire Maldives archipelago to investigate the potential impact of plausible far-field tsunamis across the Indian Ocean at the
island scale. The results indicate that the bathymetry of the Atolls, which are characterized by very steep boundaries offshore,
is extremely efficient in absorbing and redirecting incoming tsunami waves. Results also highlight the importance that local
1effects have in modulating tsunami amplitude nearshore, including the location of the Atoll in question, the location of a given
island within the Atoll, and the distance of that island to the reef, as well as a variety of other factors. We also find that the
refraction and diffraction of tsunami waves within individual Atolls contribute to the maximum tsunami amplitude patterns
observed across the islands in the Atolls. The findings from this study contribute to a better understanding of tsunamis across
complex Atoll systems, and will help decision and policy makers in the Maldives asses the potential impact of tsunamis across
individual islands. An online tool is provided which presents users with a simple interface allowing the wider community to
browse the simulation results presented here and assess the potential impact of tsunamis at the local scale. |
URI: | http://saruna.mnu.edu.mv/jspui/handle/123456789/14390 |
Appears in Collections: | ތިމާވެށި Environment A
|
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