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Figure 13. Relative Coastal Vulnerability ranking for National Park of American Samoa. Click on figure for larger image.

The CVI values calculated for National Park of American Samoa range from 3.87 to 9.80. The mean CVI value is 6.69; the mode is 6.93 and the median is 6.71. The standard deviation is 1.43. The 25th, 50th, and 75th percentiles are 5.5, 6.8 and 7.0, respectively.

Figure 13 shows a map of the coastal vulnerability index for National Park of American Samoa. The CVI scores are divided into low, moderate, high, and very high-vulnerability categories based on the quartile ranges and visual inspection of the data. CVI values below 5.5 are assigned to the low vulnerability category. Values from 5.5 to 6.8 are

Figure 14. Percentage of NP of American Samoa shoreline in each CVI category. Click on figure for larger image.

considered moderate vulnerability. High-vulnerability values lie between 6.81 and 7.0. CVI values above 7.0 are classified as very high vulnerability. Figure 14 shows the percentage of National Park of American Samoa shoreline in each vulnerability category. Nearly 60 km (37 miles) of shoreline are evaluated along the national park. Of this total, twenty-seven percent of the mapped shoreline is classified as being at very high vulnerability due to future sea-level rise. Twenty percent is classified as high vulnerability, twenty percent as moderate vulnerability, and thirty-four percent as low vulnerability.