After the growing season, that is after September, AD 923; some unleafed trees died in what is now Seattle. This is the sort of thing for which I like Seleucid reckoning: during early AG 1235.
The researchers have this exact date - and season - because of Miyake. Miyake spikes at the AiD 774 and 993 have made-possible a range of exact dates for tree death; e.g., tracking from the latter, the Markland settlement AD 1021.
The most-famous winter 'quake in Cascadia was that which the Japanese recorded 26 January 1700 (AG 2011) - as a tsunami, from nowhere. Did the Japanese record anything for AD 923/4?
Just getting a half Seleucid year is excellent for judging when the next quake will strike. Seems to be eight centuries. So the region has five more to go.
BACKDATE 10/11 in light of the 4.3.
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