. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 122 40 20 Distance (m) Gravel b) S "dge V Toe of V beach \7 Reef surface _r°* 20 40 Distance (m) 60. | Vegetated island I Eroded island Overwash deposition Survey benchmark Toe of beach — Jan 02 & Feb 03 Toe of beach June 02 ' Toe of beach & y Tsunami-induced scarping survey profile Feb 05 ff Tsunami-induced gullying Figure 15. Pre- and post-tsunami plan and profile changes on Gaaviligili Island. Location of island shown in Figure 2. EROSIONAL AND DEPOSITIONAL SIGNATURES The changes in island area
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 122 40 20 Distance (m) Gravel b) S "dge V Toe of V beach \7 Reef surface _r°* 20 40 Distance (m) 60. | Vegetated island I Eroded island Overwash deposition Survey benchmark Toe of beach — Jan 02 & Feb 03 Toe of beach June 02 ' Toe of beach & y Tsunami-induced scarping survey profile Feb 05 ff Tsunami-induced gullying Figure 15. Pre- and post-tsunami plan and profile changes on Gaaviligili Island. Location of island shown in Figure 2. EROSIONAL AND DEPOSITIONAL SIGNATURES The changes in island area and beach dimensions described above resulted from tsunami-driven erosional and depositional processes. These processes produced distinctive morphological and sedimentary signatures, which if preserved, can be used as indicators of the incidence of tsunami. During the field survey, observations and measurements were made of both erosional and depositional signatures which are briefly described below. Erosional Signatures There were two main forms of tsunami-induced erosion on the study islands: erosional scarps and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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