Answers are grounded in this paper and cite their sources.
Harold Jeffreys, F.R.S.; Some Japanese Deep-Focus Earthquakes, Geophysical Supplements to the Monthly Notices of the Royal Astronomical Society, Volume 4, Issue
No takes yet. Share an insight, caveat, or question.
Harold (1939) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: