Abstract
A historical record of a seismic tsunami is identified in the Irish annals for October 720 (all dates herein CE). It is contained in the earliest stratum of the annals, which survives in the form of a handful of iterated scribal copies of the foundational text of the tradition. This was compiled by the contemporary observation of noteworthy events for the years c. 563–740 at the monastery of Iona in the Scottish Hebrides. The 720 event is close outside the 2σ radiocarbon terminus ante quem date ranges for tsunami deposits identified at Dury Voe (530–660) and Basta Voe (430–650) in the Shetland Isles, and is identified as a candidate progenitor. The possibility of the existence of associated tsunami deposits in Scotland or on the north coast of Ireland is highlighted.
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