This report, authored by Jon Peterson and published by the U.S. Geological Survey, presents a catalog of seismic background noise spectra from a global network of seismograph stations and refines existing models of seismic background noise. The study primarily uses data from the U.S. Geological Survey's Albuquerque Seismological Laboratory (ASL) archive, which dates back to 1972. The report covers 75 stations, most of which are part of the global seismograph network, and discusses various data acquisition systems, including SRO, ASRO, DWWSSN, CDSN, IRIS/USGS, IRIS/IDA, RSTN, and TERRAscope systems. The data selection process aimed to capture representative noise levels during both quiet and noisy periods at the stations. The report details the data preparation methods, including spectral analysis techniques, and presents station noise spectra in the form of figures and tables. It also discusses non-seismic noise, short-period and long-period seismic noise, and introduces new noise models, such as the new low-noise model (NLNM) and new high-noise model (NHNM). The report highlights the variability of background noise across different periods and station types, emphasizing the importance of site selection and instrument placement for reducing noise.This report, authored by Jon Peterson and published by the U.S. Geological Survey, presents a catalog of seismic background noise spectra from a global network of seismograph stations and refines existing models of seismic background noise. The study primarily uses data from the U.S. Geological Survey's Albuquerque Seismological Laboratory (ASL) archive, which dates back to 1972. The report covers 75 stations, most of which are part of the global seismograph network, and discusses various data acquisition systems, including SRO, ASRO, DWWSSN, CDSN, IRIS/USGS, IRIS/IDA, RSTN, and TERRAscope systems. The data selection process aimed to capture representative noise levels during both quiet and noisy periods at the stations. The report details the data preparation methods, including spectral analysis techniques, and presents station noise spectra in the form of figures and tables. It also discusses non-seismic noise, short-period and long-period seismic noise, and introduces new noise models, such as the new low-noise model (NLNM) and new high-noise model (NHNM). The report highlights the variability of background noise across different periods and station types, emphasizing the importance of site selection and instrument placement for reducing noise.