Vertical Land Motion - Tutuila and Aunuu, American Samoa

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Land subsidence rates across Tutuila and Aunuu are drawn from recent work by Huang et al. (2022) showing that the average rate of subsidence on these islands is spatially variable and ranges from 6 to 9 mm/yr. The study analyzed all available radar data from the European Space Agency (ESA) Sentinel-1 satellite, which covers Tutuila and Aunuu only, and derived an average subsidence rate for the 6-year period between September 2015 to December 2022. Data are available over areas where radar data was successfully used to retrieve unambiguous measurements. Vertical land motion (VLM) measurements are provided by this data layer in millimeters per year (mm/yr), with negative values indicating land subsidence.

Data and resources

GeoServer

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PacIOOS: American Samoa Sea Level Rise Viewer

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Open Researcher and Contributor ID (ORCID) Identifier

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Research Organization Registry (ROR) Identifier

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Open Researcher and Contributor ID (ORCID) Identifier

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Research Organization Registry (ROR) Identifier

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Open Researcher and Contributor ID (ORCID) Identifier

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Research Organization Registry (ROR) Identifier

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Research Organization Registry (ROR) Identifier

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Open Researcher and Contributor ID (ORCID) Identifier

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Research Organization Registry (ROR) Identifier

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Open Researcher and Contributor ID (ORCID) Identifier

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Research Organization Registry (ROR) Identifier

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Research Organization Registry (ROR) Identifier

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OGC-WFS

Open Geospatial Consortium Web Feature Service (WFS). Supported WFS versions include 1.0.0, 1.1.0, and 2.0.0. Supported output formats include CSV, GeoJSON,…

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Open Researcher and Contributor ID (ORCID) Identifier

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Research Organization Registry (ROR) Identifier

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Unnamed resource

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Research Organization Registry (ROR) Identifier

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OGC-WMS

Open Geospatial Consortium Web Map Service (WMS). Supported WMS versions include 1.1.1 and 1.3.0. Supported map formats include AtomPub, GeoRSS, GeoTIFF, GIF,…

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Additional information

Date (creation)	2022-11-23
Date (issued)	2022-11-23
Date (revision)	2022-11-23
Status	onGoing
Update frequency	asNeeded
Metadata language	en
License	The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, University of Hawaii, PacIOOS, NOAA, State of Hawaii nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
Source metadata	ISO 19115 XML
Last updated	2026-11-04
Created	2026-11-04
API	package_show