Observing a Helicorder (Seismic Recording Instrument), 1975 (Updated two months ago)

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An individual observes a helicorder, an instrument used to continuously record seismic activity. The rotating drum displays ground motion over time as detected by a seismograph station, with reference to Greenwich Mean Time shown above the instrument.

Tags: faculty, staff and administration

Added to SFSU Over the Years on July 31, 2026.

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Information

  • Identifier: TP-ATA-0155
  • Date: 1975
  • Context: <p><strong>Credits:</strong>&nbsp;Some descriptions were developed with the assistance of ChatGPT, an AI language model by OpenAI.</p>
  • Geographic Coverage: San Francisco, CA
  • Temporal Coverage: 1970s
  • Type: Still Image
  • Source: San Francisco State University Archives
  • Rights: Public

Content

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Version history

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Update by DIVA Digitization Team two months ago
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