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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.

- 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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