EOST Jardin des Sciences
Université de Strasbourg
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8 - Ewing-Press


Ewing-Press vertical

Made in 1953 at the Lamont Geological Observatory of Columbia (United States), it has been in use in Strasbourg from 1963 to 1975.

  • electromagnetic seismometers combined with a galvanometer (of similar conception to Galitzine seismometers)
  • the period can be fixed up to 30s
  • optical recording on photopaper
  • the glass ball on the vertical component eliminates the effect of variations in pressure.

Long period apparatus of this type equipped the stations of the worldwide American Network, WWSSN. They are perfectly adapted to surface wave recording.