In the wake of the very large Indian Ocean tsunami on 26 December 2004, and several subsequent events in the Pacific Ocean, scientific and disaster mitigation initiatives have taken place to better understand and observe tsunami propagation. This paper describes observations made on nearshore long‐period seismometers of a little known and, to our knowledge, recently discovered phenomenon associated with the passage of tsunamis near a coast. It provides further insight into this phenomenon. Observations of long‐period effects of the passage of tsunamis on the horizontal components of nearshore seismometers were initially made by Yuan et al. (2005). A quantitative...

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