Rates of Vertical Land Motion (VLM) on Tutuila (American Samoa) and Upolu (Samoa) (from 3 December 2015 to 16 April 2020 and from 28 April 2020 to 27 November 2023)

Dataset associated with the resubmitted manuscript under revision "Spatiotemporal Patterns of Subsidence and Sea Level Rise in the Samoan Islands Nearly 15 Years after the 2009 Samoa-Tonga Earthquake" by S. A. Huang, J. M. Sauber, S.-C. Han, R. Ray, and E. J. Fielding.

Average VLM rates are provided for Tutuila (American Samoa) and Upolu (Samoa) over two subsets:

3 December 2015 to 16 April 2020

28 April 2020 to 27 November 2023

VLM rates were derived using the PS-InSAR technique described in the publication at https://doi.org/10.1109/LGRS.2024.3358737. 

The following files are included here:

plot_ps_data_tutuila_upolu.m: Matlab script to visualize the data included in all the *.mat files (Figures 4 and 5 and the histograms in 8c and 9c without annotations). Requires Computer Vision Toolbox.

Upolu:

upolu_ampl.mat: Amplitude backscatter from Upolu averaged from all scenes, multilooked for speckle reduction and resampled to the dataset size. Normalized to 1.

latvals.mat: Latitude vector associated with both Upolu datasets.

lonvals.mat: Longitude vector associated with both Upolu datasets.

upolu_15-20_vlm.mat: Computed VLM rates across Upolu for the 2015-2020 time period [mm/yr]. All non-PS have an "NaN" value.

upolu_15-20_vlm_uncert.mat: Uncertainty of VLM across Upolu for the 2015-2020 time period [mm/yr]. All non-PS have an "NaN" value.

upolu_20-23_vlm.mat: Computed VLM rates across Upolu for the 2020-2023 time period [mm/yr]. All non-PS have an "NaN" value.

upolu_20-23_vlm_uncert.mat: Uncertainty of VLM across Upolu for the 2020-2023 time period [mm/yr]. All non-PS have an "NaN" value.

Tutuila: 

tutuila_ampl.mat: Amplitude backscatter from Tutuila averaged from all scenes, multilooked for speckle reduction and resampled to the dataset size. Normalized to 1.

tutuila_latvals.mat: Latitude vector associated with both Tutuila datasets.

tutuila_lonvals.mat: Longitude vector associated with both Tutuila datasets.

tutuila_15-20_vlm.mat: Computed VLM rates across Tutuila Island for the 2015-2020 time period [mm/yr]. All non-PS have an "NaN" value.

tutuila_15-20_vlm_uncert.mat: Uncertainty of VLM across Tutuila Island for the 2015-2020 time period[mm/yr]. All non-PS have an "NaN" value.

tutuila_20-23_vlm.mat: Computed VLM rates across Tutuila Island for the 2020-2023 time period [mm/yr]. All non-PS have an "NaN" value.

tutuila_20-23_vlm_uncert.mat: Uncertainty of VLM across Tutuila Island for the 2020-2023 time period[mm/yr]. All non-PS have an "NaN" value.