@misc{indiciae5882e2b1884e,
  title = {Time varying spectral characteristics of strong ground motions; the Imperial Valley, California, earthquake of October 15, 1979},
  author = {Erdal Safak and F.M. Bendimerad},
  year = {1986},
  doi = {10.3133/ofr86443},
  url = {https://pubs.usgs.gov/publication/ofr86443},
  note = {Source identifier: ofr86443}
}