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Four old and very hard-to-find texts about oceanic T waves

When studying oceanic / seismic T waves, the following four papers, which are among the oldest known descriptions of T waves, are highly cited in modern papers but are extremely hard to find in original form. We thus put them here in PDF format, for people who are interested:

- Jaggar, T. A., How the seismograph works, The Volcano Letter, vol. 268, p. 1-4 (1930). Here is a PDF scan. Contains the oldest known record of a T wave (not yet called a T wave back then), in the figure on page 4, recorded in October 1927.

- Collins, M. P., Bulletin Number 5, Harvard University Seismograph Station, number 5, 23 pages (1936). This is not a paper, it is a bulletin of observations coming from a seismic station. Here is a PDF scan. On page 13 it contains one of the earliest remarks about an unusual signal in the records. Many thanks to my colleague and friend Prof. Miaki Ishii from Harvard University for providing a copy of this very hard to find document!

- Linehan, D. S. J., Earthquakes in the West Indian region, Transactions of the American Geophysical Union, vol. 21, p. 229-232 (1940). Here is a PDF scan. This is the paper that coined the expression “T waves”. On page 230: “after the P-group is a third unidentified group which we have labelled as T” (T standing for Third or Tertiary).

- Ravet, J., Remarques sur quelques enregistrements d'ondes à très courte période au cours de tremblements de terre lointains à l'Observatoire du Faiere, Papeete, Tahiti (in French), Proceedings of the Sixth Pacific Science Congress, vol. 1, p. 127-130 (1940). Here is a PDF scan.


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