@misc{indiciae79e44bb7cd4b,
  title = {Analysis of seismic noise at The Geysers geothermal area, California},
  author = {H. M. Iyer},
  year = {1972},
  doi = {10.3133/ofr72183},
  url = {https://pubs.usgs.gov/publication/ofr72183},
  note = {Source identifier: ofr72183}
}