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Marshall Islands Fringing Reef and Atoll Lagoon Observations of the Tohoku Tsunami

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Abstract

The magnitude 9.0 Tohoku earthquake on 11 March 2011 generated a tsunami which caused significant impacts throughout the Pacific Ocean. A description of the tsunami within the lagoons and on the surrounding fringing reefs of two mid-ocean atoll islands is presented using bottom pressure observations from the Majuro and Kwajalein atolls in the Marshall Islands, supplemented by tide gauge data in the lagoons and by numerical model simulations in the deep ocean. Although the initial wave arrival was not captured by the pressure sensors, subsequent oscillations on the reef face resemble the deep ocean tsunami signal simulated by two numerical models, suggesting that the tsunami amplitudes over the atoll outer reefs are similar to that in deep water. In contrast, tsunami oscillations in the lagoon are more energetic and long lasting than observed on the reefs or modelled in the deep ocean. The tsunami energy in the Majuro lagoon exhibits persistent peaks in the 30 and 60 min period bands that suggest the excitation of closed and open basin normal modes, while energy in the Kwajalein lagoon spans a broader range of frequencies with weaker, multiple peaks than observed at Majuro, which may be associated with the tsunami behavior within the more irregular geometry of the Kwajalein lagoon. The propagation of the tsunami across the reef flats is shown to be tidally dependent, with amplitudes increasing/decreasing shoreward at high/low tide. The impact of the tsunami on the Marshall Islands was reduced due to the coincidence of peak wave amplitudes with low tide; however, the observed wave amplitudes, particularly in the atoll lagoon, would have led to inundation at different tidal phases.

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Acknowledgments

This study was supported by a grant from the National Science Foundation (OCE-0927407). DART buoy data were obtained from the NOAA National Data Buoy Center (http://www.ndbc.noaa.gov/dar.shtml), Kwajalein tide gauge data from the NOAA Center for Operational Oceanographic Products and Services (http://tidesandcurrents.noaa.gov), and Majuro tide gauge data from the National Tidal Centre, Australia. Comments by Alexander Rabinovich and two anonymous reviewers greatly improved the manuscript. We thank Rachel Tang for the MOST model data. Christopher Kontoes, Carly Fetherolf, and Derek Young were responsible for the Marshall Islands field observations. Hyang Yoon provided graphics and data processing support.

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Ford, M., Becker, J.M., Merrifield, M.A. et al. Marshall Islands Fringing Reef and Atoll Lagoon Observations of the Tohoku Tsunami. Pure Appl. Geophys. 171, 3351–3363 (2014). https://doi.org/10.1007/s00024-013-0757-8

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