We propose a numerical method to estimate the local wave height and period of a tsunami from the distributions of boulders. The method was applied to boulders (<23 t) at Pakarang Cape, Thailand that were displaced from the reef slope onto the tidal bench by the 2004 Indian Ocean tsunami. They were deposited characteristically below the high-tide line, irrespective of size and no boulders were deposited on land. These features were used as the constraint of the calculation. We conducted over 10,000 cross-sectional calculations to satisfy above mentioned constraints, showing that the wave height and period at the shoreline were calculated to be 4–6 m and 18–37 min, respectively, which well concur with observed values. The input parameters for this calculation are the sizes and initial positions of boulders with seaward/landward limits, which are obtainable through the geological survey for historical and pre-historical tsunamis. This method is useful to estimate the local wave height and period of historical and pre-historical tsunamis from boulders reported throughout the world.
CITATION STYLE
Goto, K., Okada, K., & Imamura, F. (2014). Estimating the 2004 Indian Ocean tsunami wave height and period from boulders’ distribution at Pakarang Cape, Thailand. In Advances in Natural and Technological Hazards Research (Vol. 35, pp. 215–223). Springer Netherlands. https://doi.org/10.1007/978-94-007-7269-4_11
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