A seismic tsunami in the Irish annals, recorded at Iona in October 720

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