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<p>Starting in the early 1950s, Lamont Geological Observatory of Columbia University operated long-period seismographs at multiple locations around the world. At the time of the 1957–1958 International Geophysical Year (IGY), seventeen stations were operating. The seismographs were of a similar design to that later adopted for the World Wide Standardized Seismograph Network (WWSSN), and the Lamont-IGY network can be considered an experimental prelude to that network. Most of the original seismograms from the Lamont-IGY network have been located in storage. Here we describe the network, the instrumentation, and seismogram availability. The heterogeneous instrument responses that are characteristic of the early years of the Lamont-IGY network pose a challenge for modern quantitative waveform analysis. We use detailed calibration data collected in 1962 to estimate instrument parameters at thirteen of the stations. The new instrument transfer functions are converted to a modern poles-zeros description of the seismograph response.</p>

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Seismograms and instrument-response functions for stations of the Lamont-IGY long-period seismograph network, 1957–1962

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Göran Ekström,
  • Jocely Lopez Luna

摘要

Starting in the early 1950s, Lamont Geological Observatory of Columbia University operated long-period seismographs at multiple locations around the world. At the time of the 1957–1958 International Geophysical Year (IGY), seventeen stations were operating. The seismographs were of a similar design to that later adopted for the World Wide Standardized Seismograph Network (WWSSN), and the Lamont-IGY network can be considered an experimental prelude to that network. Most of the original seismograms from the Lamont-IGY network have been located in storage. Here we describe the network, the instrumentation, and seismogram availability. The heterogeneous instrument responses that are characteristic of the early years of the Lamont-IGY network pose a challenge for modern quantitative waveform analysis. We use detailed calibration data collected in 1962 to estimate instrument parameters at thirteen of the stations. The new instrument transfer functions are converted to a modern poles-zeros description of the seismograph response.