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Coral clasts noted in 2008 to 2017 that pertain to sea floods of the past 1,000 years on Anegada, British Virgin Islands

Dates

Publication Date
Start Date
2008-02-19
End Date
2017-03-15

Citation

Atwater, Brian F., compiler, 2023, Field evidence noted in 2008 to 2023 that pertains to sea floods of the past millennium on Anegada, British Virgin Islands: U.S. Geological Survey data release, https://doi.org/10.5066/P9TLLBOC.

Summary

This part of the release provides an updated georeferenced catalog of coral boulders and cobbles pertaining to extreme waves on Anegada, a low Caribbean island perched south of the Puerto Rico Trench. The main taxa listed are the boulder star coral Orbicella franksii (37 localities), brain coral Pseudodiploria strigosa (171), elkhorn coral Acropora palmata (36), mustard hill coral Porites astreoides (29).

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Corals_example.jpg thumbnail 1.77 MB image/jpeg
Corals.jpg thumbnail 1.74 MB image/jpeg
Corals.zip 16.05 KB application/zip
Corals.csv 30.18 KB text/csv

Purpose

As explained further in the Overview, the full data release is intended to support assessments of hazards from unusually large tsunamis generated in the northeast Caribbean. The documented evidence for such hazards includes coral clasts on Anegada that were derived offshore the north and northeast parts of Anegada, and which were scattered hundreds of meters southward or southwestward from there. Those clasts have yielded approximate ages for a catastrophic sea flood about six centuries ago (https://doi.org/10.1130/GES01356.1), and they have served as ground truth in simulations of hypothetical tsunamis from faulting in the Puerto Rico Trench (https://doi.org/10.1016/j.earscirev.2022.104018).
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